Wikipedia

Radium

This article is about the chemical element. For other uses, see Radium (disambiguation).
Not to be confused with Radon.

Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra3N2). All isotopes of radium are radioactive, the most stable isotope being radium-226 with a half-life of 1,600 years. When radium decays, it emits ionizing radiation as a by-product, which can excite fluorescent chemicals and cause radioluminescence. For this property, it was widely used in self-luminous paints following its discovery. Of the radioactive elements that occur in quantity, radium is considered particularly toxic, and it is carcinogenic due to the radioactivity of both it and its immediate decay product radon as well as its tendency to accumulate in the bones.

Radium, 88Ra
Radium electroplated on a very small sample of copper foil and covered with polyurethane to prevent reaction with the air
Radium
Pronunciation/ˈreɪdiəm/ ​(RAY-dee-əm)
Appearancesilvery white metallic
Mass number[226]
Radium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Ba
↑
Ra
↓
(Ubn)
francium ← radium → actinium
Atomic number (Z)88
Groupgroup 2 (alkaline earth metals)
Periodperiod 7
Block  s-block
Electron configuration[Rn] 7s2
Electrons per shell2, 8, 18, 32, 18, 8, 2
Physical properties
Phase at STPsolid
Melting point973 K ​(700 °C, ​1292 °F) (disputed)
Boiling point2010 K ​(1737 °C, ​3159 °F)
Density (near r.t.)5.5 g/cm3
Heat of fusion8.5 kJ/mol
Heat of vaporization113 kJ/mol
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 819 906 1037 1209 1446 1799
Atomic properties
Oxidation statescommon: +2
ElectronegativityPauling scale: 0.9
Ionization energies
  • 1st: 509.3 kJ/mol
  • 2nd: 979.0 kJ/mol
Covalent radius221±2 pm
Van der Waals radius283 pm
Color lines in a spectral range
Spectral lines of radium
Other properties
Natural occurrencefrom decay
Crystal structure ​body-centered cubic (bcc) (cF4)
Lattice constant
Body-centered cubic crystal structure for radium
a = 514.8 pm (near r.t.)[1]
Thermal conductivity18.6 W/(m⋅K)
Electrical resistivity1 µΩ⋅m (at 20 °C)
Magnetic orderingnonmagnetic
CAS Number7440-14-4
History
DiscoveryPierre and Marie Curie (1898)
First isolationMarie Curie (1910)
Isotopes of radium
Main isotopes[2] Decay
abun­dance half-life (t1/2) mode pro­duct
223Ra trace 11.43 d α 219Rn
224Ra trace 3.6319 d α 220Rn
225Ra trace 14.9 d β− 225Ac
α[3] 221Rn
226Ra trace 1599 y α 222Rn
228Ra trace 5.75 y β− 228Ac
 Category: Radium
| references
  • Radium-226 radiation source.
  • Activity 3300 Bq (3.3 kBq)

Radium, in the form of radium chloride, was discovered by Marie and Pierre Curie in 1898 from ore mined at Jáchymov. They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later. Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne through the electrolysis of radium chloride in 1910, and soon afterwards the metal started being produced on larger scales in Austria, the United States, and Belgium. However, the amount of radium produced globally has always been small in comparison to other elements, and by the 2010s, annual production of radium, mainly via extraction from spent nuclear fuel, was less than 100 grams.

In nature, radium is found in uranium ores in quantities as small as a seventh of a gram per ton of uraninite, and in thorium ores in trace amounts. Radium is not necessary for living organisms, and its radioactivity and chemical reactivity make adverse health effects likely when it is incorporated into biochemical processes because of its chemical mimicry of calcium. As of 2018, other than in nuclear medicine, radium has no commercial applications. Formerly, from the 1910s to the 1970s, it was used as a radioactive source for radioluminescent devices and also in radioactive quackery for its supposed curative power. In nearly all of its applications, radium has been replaced with less dangerous radioisotopes, with one of its few remaining non-medical uses being the production of actinium in nuclear reactors.

Bulk properties

Radium is the heaviest known alkaline earth metal and is the only radioactive member of its group. Its physical and chemical properties most closely resemble its lighter congener, barium.[4]

Pure radium is a volatile, lustrous silvery-white metal, even though its lighter congeners calcium, strontium, and barium have a slight yellow tint.[4] Radium's lustrous surface rapidly becomes black upon exposure to air, likely due to the formation of radium nitride (Ra3N2).[5] Its melting point is either 700 °C (1,292 °F) or 960 °C (1,760 °F)[a] and its boiling point is 1,737 °C (3,159 °F); however, this is not well established.[6] Both of these values are slightly lower than those of barium, confirming periodic trends down the group 2 elements.[7] Like barium and the alkali metals, radium crystallizes in the body-centered cubic structure at standard temperature and pressure: the radium–radium bond distance is 514.8 picometers.[8] Radium has a density of 5.5 g/cm3, higher than that of barium, and the two elements have similar crystal structures (bcc at standard temperature and pressure).[9][10]

Isotopes

Main article: Isotopes of radium
 
Decay chain of 238U, the primordial progenitor of 226Ra

Radium has 33 known isotopes with mass numbers from 202 to 234, all of which are radioactive.[2] Four of these – 223Ra (half-life 11.4 days), 224Ra (3.64 days), 226Ra (1600 years), and 228Ra (5.75 years) – occur naturally in the decay chains of primordial thorium-232, uranium-235, and uranium-238 (223Ra from uranium-235, 226Ra from uranium-238, and the other two from thorium-232). These isotopes nevertheless still have half-lives too short to be primordial radionuclides, and only exist in nature from these decay chains.[11] Together with the mostly artificial 225Ra (15 d), which occurs in nature only as a decay product of minute traces of neptunium-237,[12] these are the five most stable isotopes of radium.[2] All other 27 known radium isotopes have half-lives under two hours, and the majority have half-lives under a minute.[2] Of these, 221Ra (half-life 28 s) also occurs as a 237Np daughter, and 220Ra and 222Ra would be produced by the still-unobserved double beta decay of natural radon isotopes.[13] At least 12 nuclear isomers have been reported, the most stable of which is radium-205m with a half-life between 130~230 milliseconds; this is still shorter than twenty-four ground-state radium isotopes.[2]

226Ra is the most stable isotope of radium and is the last isotope in the (4n + 2) decay chain of uranium-238 with a half-life of over a millennium; it makes up almost all of natural radium. Its immediate decay product is the dense radioactive noble gas radon (specifically the isotope 222Rn), which is responsible for much of the danger of environmental radium.[14][b] It is 2.7 million times more radioactive than the same molar amount of natural uranium (mostly uranium-238), due to its proportionally shorter half-life.[15][16]

A sample of radium metal maintains itself at a higher temperature than its surroundings because of the radiation it emits. Natural radium (which is mostly 226Ra) emits mostly alpha particles, but other steps in its decay chain (the uranium or radium series) emit alpha or beta particles, and almost all particle emissions are accompanied by gamma rays.[17]

Experimental nuclear physics studies have shown that nuclei of several radium isotopes, such as 222Ra, 224Ra and 226Ra, have reflection-asymmetric ("pear-like") shapes.[18] In particular, this experimental information on radium-224 has been obtained at ISOLDE using a technique called Coulomb excitation.[19][20]

Chemistry

Radium only exhibits the oxidation state of +2 in solution.[5] It forms the colorless Ra2+ cation in aqueous solution, which is highly basic and does not form complexes readily.[5] Most radium compounds are therefore simple ionic compounds,[5] though participation from the 6s and 6p electrons (in addition to the valence 7s electrons) is expected due to relativistic effects and would enhance the covalent character of radium compounds such as RaF2 and RaAt2.[21] For this reason, the standard electrode potential for the half-reaction Ra2+ (aq) + 2e- → Ra (s) is −2.916 V, even slightly lower than the value −2.92 V for barium, whereas the values had previously smoothly increased down the group (Ca: −2.84 V; Sr: −2.89 V; Ba: −2.92 V).[22] The values for barium and radium are almost exactly the same as those of the heavier alkali metals potassium, rubidium, and caesium.[22]

Compounds

Solid radium compounds are white as radium ions provide no specific coloring, but they gradually turn yellow and then dark over time due to self-radiolysis from radium's alpha decay.[5] Insoluble radium compounds coprecipitate with all barium, most strontium, and most lead compounds.[23]

Radium oxide (RaO) is poorly characterized, as the reaction of radium with air results in the formation of radium nitride.[24] Radium hydroxide (Ra(OH)2) is formed via the reaction of radium metal with water, and is the most readily soluble among the alkaline earth hydroxides and a stronger base than its barium congener, barium hydroxide.[25] It is also more soluble than actinium hydroxide and thorium hydroxide: these three adjacent hydroxides may be separated by precipitating them with ammonia.[25]

Radium chloride (RaCl2) is a colorless, luminescent compound. It becomes yellow after some time due to self-damage by the alpha radiation given off by radium when it decays. Small amounts of barium impurities give the compound a rose color.[25] Its It is soluble in water, though less so than barium chloride, and its solubility decreases with increasing concentration of hydrochloric acid. Crystallization from aqueous solution gives the dihydrate RaCl2·2H2O, isomorphous with its barium analog.[25]

Radium bromide (RaBr2) is also a colorless, luminous compound.[25] In water, it is more soluble than radium chloride. Like radium chloride, crystallization from aqueous solution gives the dihydrate RaBr2·2H2O, isomorphous with its barium analog. The ionizing radiation emitted by radium bromide excites nitrogen molecules in the air, making it glow. The alpha particles emitted by radium quickly gain two electrons to become neutral helium, which builds up inside and weakens radium bromide crystals. This effect sometimes causes the crystals to break or even explode.[25]

Radium nitrate (Ra(NO3)2) is a white compound that can be made by dissolving radium carbonate in nitric acid. As the concentration of nitric acid increases, the solubility of radium nitrate decreases, an important property for the chemical purification of radium.[25]

Radium forms much the same insoluble salts as its lighter congener barium: it forms the insoluble sulfate (RaSO4, the most insoluble known sulfate), chromate (RaCrO4), carbonate (RaCO3), iodate (Ra(IO3)2), tetrafluoroberyllate (RaBeF4), and nitrate (Ra(NO3)2). With the exception of the carbonate, all of these are less soluble in water than the corresponding barium salts, but they are all isostructural to their barium counterparts. Additionally, radium phosphate, oxalate, and sulfite are probably also insoluble, as they coprecipitate with the corresponding insoluble barium salts.[26] The great insolubility of radium sulfate (at 20 °C, only 2.1 mg will dissolve in 1 kg of water) means that it is one of the less biologically dangerous radium compounds.[27] The large ionic radius of Ra2+ (148 pm) results in weak ability to form coordination complexes and poor extraction of radium from aqueous solutions when not at high pH.[28]

Occurrence

All isotopes of radium have half-lives much shorter than the age of the Earth, so that any primordial radium would have decayed long ago. Radium nevertheless still occurs in the environment, as the isotopes 223Ra, 224Ra, 226Ra, and 228Ra are part of the decay chains of natural thorium and uranium isotopes; since thorium and uranium have very long half-lives,[2] these daughters are continually being regenerated by their decay.[11] Of these four isotopes, the longest-lived is 226Ra (half-life 1600 years), a decay product of natural uranium. Because of its relative longevity, 226Ra is the most common isotope of the element, making up about one part per trillion of the Earth's crust; essentially all natural radium is 226Ra.[29] Thus, radium is found in tiny quantities in the uranium ore uraninite and various other uranium minerals, and in even tinier quantities in thorium minerals. One ton of pitchblende typically yields about one seventh of a gram of radium.[30] One kilogram of the Earth's crust contains about 900 picograms of radium, and one liter of sea water contains about 89 femtograms of radium.[31]

History

Further information: Marie Curie § New elements
 
Marie and Pierre Curie experimenting with radium, a drawing by André Castaigne
 
Glass tube of radium chloride kept by the US Bureau of Standards that served as the primary standard of radioactivity for the United States in 1927.

Radium was discovered by Marie Skłodowska-Curie and her husband Pierre Curie on 21 December 1898 in a uraninite (pitchblende) sample from Jáchymov.[32] While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive. In July 1898, while studying pitchblende, they isolated an element similar to bismuth which turned out to be polonium. They then isolated a radioactive mixture consisting of two components: compounds of barium, which gave a brilliant green flame color, and unknown radioactive compounds which gave carmine spectral lines that had never been documented before. The Curies found the radioactive compounds to be very similar to the barium compounds, except they were less soluble. This discovery made it possible for the Curies to isolate the radioactive compounds and discover a new element in them. The Curies announced their discovery to the French Academy of Sciences on 26 December 1898.[33] The naming of radium dates to about 1899, from the French word radium, formed in Modern Latin from radius (ray): this was in recognition of radium's emission of energy in the form of rays.[34] The gaseous emissions of radium, radon, were recognized and studied extensively by Friedrich Ernst Dorn in the early 1900s, though at the time they were characterized as "radium emanations".[35]

In September 1910, Marie Curie and André-Louis Debierne announced that they had isolated radium as a pure metal through the electrolysis of pure radium chloride (RaCl2) solution using a mercury cathode, producing radium–mercury amalgam.[36] This amalgam was then heated in an atmosphere of hydrogen gas to remove the mercury, leaving pure radium metal.[37] Later that same year, E. Ebler isolated radium metal by thermal decomposition of its azide, Ra(N3)2.[38][39] Radium metal was first industrially produced at the beginning of the 20th century by Biraco, a subsidiary company of Union Minière du Haut Katanga (UMHK) in its Olen plant in Belgium.[40] The metal became an important export of Belgium from 1922 up until World War II.[41]

The general historical unit for radioactivity, the curie, is based on the radioactivity of 226Ra. it was originally defined as the radioactivity of one gram of radium-226,[42] but the definition was later refined to be 3.7×1010 disintegrations per second.[43]

Historical applications

Luminescent paint

 
Watch hands coated with radium paint under ultraviolet light

Radium was formerly used in self-luminous paints for watches, aircraft switches, clocks, and instrument dials and panels. A typical self-luminous watch that uses radium paint contains around 1 microgram of radium.[44] In the mid-1920s, a lawsuit was filed against the United States Radium Corporation by five dying "Radium Girls" – dial painters who had painted radium-based luminous paint on the components of watches and clocks.[45] The dial painters were instructed to lick their brushes to give them a fine point, thereby ingesting radium.[46] Their exposure to radium caused serious health effects which included sores, anemia, and bone cancer.[14]

During the litigation, it was determined that the company's scientists and management had taken considerable precautions to protect themselves from the effects of radiation, but it did not seem to protect their employees. Additionally, for several years the companies had attempted to cover up the effects and avoid liability by insisting that the Radium Girls were instead suffering from syphilis.[47]

As a result of the lawsuit, and an extensive study by the U.S. Public Health Service, the adverse effects of radioactivity became widely known, and radium-dial painters were instructed in proper safety precautions and provided with protective gear. Radium continued to be used in dials, especially in manufacturing during World War II, but from 1925 onward there were no further injuries to dial painters. [45]

From the 1960s the use of radium paint was discontinued. In many cases luminous dials were implemented with non-radioactive fluorescent materials excited by light; such devices glow in the dark after exposure to light, but the glow fades.[14] Where long-lasting self-luminosity in darkness was required, safer radioactive promethium-147 (half-life 2.6 years) or tritium (half-life 12 years) paint was used; both continue to be used as of 2018.[48] These had the added advantage of not degrading the phosphor over time, unlike radium.[49] Tritium as it is used in these applications is considered safer than radium,[50] as it emits very low-energy beta radiation[51] (even lower-energy than the beta radiation emitted by promethium)[52] which cannot penetrate the skin,[53] unlike the gamma radiation emitted by radium isotopes.[50]

 
A zeppelin altimeter from World War I. The dial, previously painted with a luminescent radium paint, has turned yellow due to the degradation of the fluorescent zinc sulfide medium.

Clocks, watches, and instruments dating from the first half of the 20th century, often in military applications, may have been painted with radioactive luminous paint. They are usually no longer luminous; this is not due to radioactive decay of the radium (which has a half-life of 1600 years) but to the fluorescence of the zinc sulfide fluorescent medium being worn out by the radiation from the radium.[54] Originally appearing as white, most radium paint from before the 1960s has tarnished to yellow over time. The radiation dose from an intact device is usually only a hazard when many devices are grouped together or if the device is disassembled or tampered with.[55]

Quackery

Main articles: Radioactive quackery and Radium fad
 
1918 ad for Radior, one of several cosmetic products claiming to contain radium for its purported curative properties[56]

Radium was once an additive in products such as cosmetics, soap, razor blades, and even beverages due to its supposed curative powers. Many contemporary products were falsely advertised as being radioactive.[57] Such products soon fell out of vogue and were prohibited by authorities in many countries after it was discovered they could have serious adverse health effects. (See, for instance, Radithor or Revigator types of "radium water" or "Standard Radium Solution for Drinking".)[54] Spas featuring radium-rich water are still occasionally touted as beneficial, such as those in Misasa, Tottori, Japan,[58] though the sources of radioactivity in these spas vary and may be attributed to radon and other radioisotopes.[59]

Medical and research uses

Radium (usually in the form of radium chloride or radium bromide) was used in medicine to produce radon gas, which in turn was used as a cancer treatment.[6] Several of these radon sources were used in Canada in the 1920s and 1930s.[60] However, many treatments that were used in the early 1900s are not used anymore because of the harmful effects radium bromide exposure caused. Some examples of these effects are anaemia, cancer, and genetic mutations.[61] As of 2011, safer gamma emitters such as 60Co, which is less costly and available in larger quantities, were usually used to replace the historical use of radium in this application,[28] but factors including increasing costs of cobalt and risks of keeping radioactive sources on site have led to an increase in the use of linear particle accelerators for the same applications.[62]

In the U.S., from 1940 through the 1960s, radium was used in nasopharyngeal radium irradiation, a treatment that was administered to children to treat hearing loss and chronic otitis. The procedure was also administered to airmen and submarine crew to treat barotrauma.[63][64]

Early in the 1900s, biologists used radium to induce mutations and study genetics. As early as 1904, Daniel MacDougal used radium in an attempt to determine whether it could provoke sudden large mutations and cause major evolutionary shifts. Thomas Hunt Morgan used radium to induce changes resulting in white-eyed fruit flies. Nobel-winning biologist Hermann Muller briefly studied the effects of radium on fruit fly mutations before turning to more affordable x-ray experiments.[65]

Production

 
Monument to the Discovery of Radium in Jáchymov

Uranium had no large scale application in the late 19th century and therefore no large uranium mines existed. In the beginning, the silver mines in Jáchymov, Austria-Hungary (now Czech Republic) were the only large sources for uranium ore.[32] The uranium ore was only a byproduct of the mining activities.[66]

In the first extraction of radium, Curie used the residues after extraction of uranium from pitchblende. The uranium had been extracted by dissolution in sulfuric acid leaving radium sulfate, which is similar to barium sulfate but even less soluble in the residues. The residues also contained rather substantial amounts of barium sulfate which thus acted as a carrier for the radium sulfate. The first steps of the radium extraction process involved boiling with sodium hydroxide, followed by hydrochloric acid treatment to minimize impurities of other compounds. The remaining residue was then treated with sodium carbonate to convert the barium sulfate into barium carbonate (carrying the radium), thus making it soluble in hydrochloric acid. After dissolution, the barium and radium were reprecipitated as sulfates; this was then repeated to further purify the mixed sulfate. Some impurities that form insoluble sulfides were removed by treating the chloride solution with hydrogen sulfide, followed by filtering. When the mixed sulfates were pure enough, they were once more converted to mixed chlorides; barium and radium thereafter were separated by fractional crystallisation while monitoring the progress using a spectroscope (radium gives characteristic red lines in contrast to the green barium lines), and the electroscope.[67]

After the isolation of radium by Marie and Pierre Curie from uranium ore from Jáchymov, several scientists started to isolate radium in small quantities. Later, small companies purchased mine tailings from Jáchymov mines and started isolating radium. In 1904, the Austrian government nationalised the mines and stopped exporting raw ore. Until 1912, when radium production increased, radium availability was low.[66]

The formation of an Austrian monopoly and the strong urge of other countries to have access to radium led to a worldwide search for uranium ores. The United States took over as leading producer in the early 1910s,[32] producing 70 g total from 1913 to 1920 in Pittsburgh alone.[68]

The Curies' process was still used for industrial radium extraction in 1940, but mixed bromides were then used for the fractionation. If the barium content of the uranium ore is not high enough, additional barium can be added to carry the radium. These processes were applied to high grade uranium ores but may not have worked well with low grade ores.[69] Small amounts of radium were still extracted from uranium ore by this method of mixed precipitation and ion exchange as late as the 1990s,[29] but as of 2011, it is extracted only from spent nuclear fuel.[70] Pure radium metal is isolated by reducing radium oxide with aluminium metal in a vacuum at 1,200 °C.[28]

In 1954, the total worldwide supply of purified radium amounted to about 5 pounds (2.3 kg).[44] Zaire and Canada were briefly the largest producers of radium in the late 1970s.[68] As of 1997. the chief radium-producing countries were Belgium, Canada, the Czech Republic, Slovakia, the United Kingdom, and Russia.[29] The annual production of radium compounds was only about 100 g in total as of 1984;[29] annual production of radium had reduced to less than 100 g by 2018.[71]

Modern applications

Radium is seeing increasing use in the field of atomic, molecular, and optical physics.[72][20] Symmetry breaking forces scale proportional to  [73] which makes radium, the heaviest alkaline earth element, well suited for constraining new physics beyond the standard model. Some radium isotopes, such as radium-225, have octupole deformed parity doublets that enhance sensitivity to charge parity violating new physics by two to three orders of magnitude compared to 199Hg.[74]

Radium is also a promising candidate for trapped ion optical clocks. The radium ion has two subhertz-linewidth transitions from the   ground state that could serve as the clock transition in an optical clock.[75] A 226Ra+ trapped ion atomic clock has been demonstrated on the   to   transition, which has been considered for the creation of a transportable optical clock as all transitions necessary for clock operation can be addressed with direct diode lasers at common wavelengths.[76]

Some of the few practical uses of radium are derived from its radioactive properties. More recently discovered radioisotopes, such as cobalt-60 and caesium-137, are replacing radium in even these limited uses because several of these isotopes are more powerful emitters, safer to handle, and available in more concentrated form.[77]

The isotope 223Ra was approved by the United States Food and Drug Administration in 2013 for use in medicine as a cancer treatment of bone metastasis in the form of a solution[78] including radium-223 chloride.[79] The main indication of treatment is the therapy of bony metastases from castration-resistant prostate cancer.[80] 225Ra has also been used in experiments concerning therapeutic irradiation, as it is the only reasonably long-lived radium isotope which does not have radon as one of its daughters.[81]

Radium was still used in 2007 as a radiation source in some industrial radiography devices to check for flawed metallic parts, similarly to X-ray imaging.[14] When mixed with beryllium, radium acts as a neutron source.[54][82] Up until at least 2004, radium-beryllium neutron sources were still sometimes used,[14][83] but other materials such as polonium and americium have become more common for use in neutron sources. RaBeF4-based (α, n) neutron sources have been deprecated despite the high number of neutrons they emit (1.84×106 neutrons per second) in favour of 241Am–Be sources.[84] As of 2011, the isotope 226Ra is mainly used to form 227Ac by neutron irradiation in a nuclear reactor.[28]

Hazards

Radium is highly radioactive, as is its immediate decay product, radon gas. When ingested, 80% of the ingested radium leaves the body through the feces, while the other 20% goes into the bloodstream, mostly accumulating in the bones. This is because the body treats radium as calcium and deposits it in the bones, where radioactivity degrades marrow and can mutate bone cells. Exposure to radium, internal or external, can cause cancer and other disorders, because radium and radon emit alpha and gamma rays upon their decay, which kill and mutate cells.[14] Radium is generally considered the most toxic of the radioactive elements.[84]

Some of the biological effects of radium include the first case of "radium-dermatitis", reported in 1900, two years after the element's discovery. The French physicist Antoine Becquerel carried a small ampoule of radium in his waistcoat pocket for six hours and reported that his skin became ulcerated. Pierre Curie attached a tube filled with radium to his arm for ten hours, which resulted in the appearance of a skin lesion, suggesting the use of radium to attack cancerous tissue as it had attacked healthy tissue.[85] Handling of radium has been blamed for Marie Curie's death, due to aplastic anemia,[86] though analysis of her levels of radium exposure done after her death find them within accepted safe levels and attribute her illness and death to her use of radiography.[87] A significant amount of radium's danger comes from its daughter radon, which as a gas can enter the body far more readily than can its parent radium.[14]

Regulation

Further information: History of radiation protection

The first published recommendations for protection against radium and radiation in general were made by the British X-ray and Radium Protection Committee and were adopted internationally in 1928 at the first meeting of the International Commission on Radiological Protection (ICRP), following preliminary guidance written by the Röntgen Society.[88] This meeting led to further developments of radiation protection programs[89] coordinated across all countries represented by the commission.[90]

Exposure to radium is still regulated internationally by the ICRP, alongside the World Health Organization.[91] The International Atomic Energy Agency (IAEA) publishes safety standards and provides recommendations for the handling of and exposure to radium in its works on naturally occurring radioactive materials and the broader International Basic Safety Standards,[92] which are not enforced by the IAEA but are available for adoption by members of the organization.[93] In addition, in efforts to reduce the quantity of old radiotherapy devices that contain radium, the IAEA has worked since 2022[94] to manage and recycle disused 226Ra sources.[95][96]

In several countries, further regulations exist and are applied beyond those recommended by the IAEA and ICRP. For example, in the United States, the Environmental Protection Agency-defined Maximum Contaminant Level for radium is 5 pCi/L for drinking water;[97] at the time of the Manhattan Project in the 1940s, the "tolerance level" for workers was set at 0.1 micrograms of ingested radium.[98] The Occupational Safety and Health Administration does not specifically set exposure limits for radium, and instead limits ionizing radiation exposure in units of roentgen equivalent man based on the exposed area of the body. Radium sources themselves, rather than worker exposures, are regulated more closely by the Nuclear Regulatory Commission,[99] which requires licensing for anyone possessing 226Ra with activity of more than 0.01 μCi.[100] The particular governing bodies that regulate radioactive materials and nuclear energy are documented by the Nuclear Energy Agency for member countries[101] – for instance, in the Republic of Korea, the nation's radiation safety standards are managed by the Korea Radioisotope Institute, established in 1985, and the Korea Institute of Nuclear Safety, established in 1990[102] – and the IAEA leads efforts in establishing governing bodies in locations that do not have government regulations on radioactive materials.[103][104]

Notes

  1. ^ Both values are encountered in sources and there is no agreement among scientists as to the true value of the melting point of radium.[5]
  2. ^ See radon mitigation.

References

  1. ^ Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
  2. ^ a b c d e f Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  3. ^ Liang, C. F.; Paris, P.; Sheline, R. K. (19 September 2000). "α decay of 225Ra". Physical Review C. 62 (4). American Physical Society (APS): 047303. Bibcode:2000PhRvC..62d7303L. doi:10.1103/physrevc.62.047303. ISSN 0556-2813.
  4. ^ a b Greenwood & Earnshaw 1997, p. 112.
  5. ^ a b c d e f Kirby & Salutsky 1964, p. 4.
  6. ^ a b Timothy P. Hanusa, Radium at the Encyclopædia Britannica
  7. ^ Lide, D.R.; et al., eds. (2004). CRC Handbook of Chemistry and Physics (84th ed.). Boca Raton, FL: CRC Press. ISBN 978-0-8493-0484-2.
  8. ^ Weigel, F.; Trinkl, A. (1968). "Zur Kristallchemie des Radiums" [On radium's chemical chrystalography]. Radiochim. Acta (in German). 10 (1–2): 78. doi:10.1524/ract.1968.10.12.78. S2CID 100313675.
  9. ^ Young, David A. (1991). "Radium". Phase Diagrams of the Elements. University of California Press. p. 85. ISBN 978-0-520-91148-2.
  10. ^ "Crystal structures of the chemical elements at 1 bar". uni-bielefeld.de. Archived from the original on 26 August 2014.
  11. ^ a b Kirby & Salutsky 1964, p. 3.
  12. ^ Peppard, D.F.; Mason, G.W.; Gray, P.R.; Mech, J.F (1952). "Occurrence of the (4n + 1) series in nature". Journal of the American Chemical Society. 74 (23): 6081–6084. doi:10.1021/ja01143a074. Archived from the original on 28 July 2019. Retrieved 6 July 2019.
  13. ^ Tretyak, V.I.; Zdesenko, Yu.G. (2002). "Tables of Double Beta Decay Data — An Update". At. Data Nucl. Data Tables. 80 (1): 83–116. Bibcode:2002ADNDT..80...83T. doi:10.1006/adnd.2001.0873.
  14. ^ a b c d e f g Radiation protection. Radium. epa.gov (Report). Radiation / Radionuclides. United States Environmental Protection Agency. Archived from the original on 11 February 2015.
  15. ^ Soddy, Frederick (25 August 2004). The Interpretation of Radium. Courier Corporation. p. 139 ff. ISBN 978-0-486-43877-1. Archived from the original on 5 September 2015. Retrieved 27 June 2015 – via Google Books.
  16. ^ Malley, Marjorie C. (2011). Radioactivity. Oxford University Press. p. 115 ff. ISBN 978-0-19-983178-4. Retrieved 27 June 2015 – via Internet Archive (archive.org).
  17. ^ Strutt, R.J. (7 September 2004). The Becquerel Rays and the Properties of Radium. Courier Corporation. p. 133. ISBN 978-0-486-43875-7. Archived from the original on 5 September 2015. Retrieved 27 June 2015.
  18. ^ Butler, P. A. (2020). "Pear-shaped atomic nuclei". Proceedings of the Royal Society A. 476 (2239): 20200202. Bibcode:2020RSPSA.47600202B. doi:10.1098/rspa.2020.0202. PMC 7426035. PMID 32821242..
  19. ^ "First observations of short-lived pear-shaped atomic nuclei – CERN". home.cern. Archived from the original on 12 June 2018. Retrieved 8 June 2018.
  20. ^ a b Gaffney, L. P.; Butler, P. A.; Scheck, M.; et al. (2013). "Studies of pear-shaped nuclei using accelerated radioactive beams". Nature. 497 (7448): 199–204. Bibcode:2013Natur.497..199G. doi:10.1038/nature12073. PMID 23657348. S2CID 4380776.
  21. ^ Thayer, John S. (2010). "Relativistic Effects and the Chemistry of the Heavier Main Group Elements". Relativistic Methods for Chemists. Challenges and Advances in Computational Chemistry and Physics. Vol. 10. Dordrecht: Springer. p. 81. doi:10.1007/978-1-4020-9975-5_2. ISBN 978-1-4020-9974-8.
  22. ^ a b Greenwood & Earnshaw 1997, p. 111.
  23. ^ Kirby & Salutsky 1964, p. 8.
  24. ^ Tyler, Paul McIntosh (1930). Radium. U.S. Department of Commerce, Bureau of Mines.
  25. ^ a b c d e f g Kirby & Salutsky 1964, pp. 4–8.
  26. ^ Kirby & Salutsky 1964, pp. 8–9.
  27. ^ Kirby & Salutsky 1964, p. 12.
  28. ^ a b c d Keller, Wolf & Shani 2011, pp. 97–98.
  29. ^ a b c d Greenwood & Earnshaw 1997, pp. 109–110.
  30. ^ "Radium" Archived 15 November 2012 at the Wayback Machine, Los Alamos National Laboratory. Retrieved 5 August 2009.
  31. ^ Section 14, Geophysics, Astronomy, and Acoustics; Abundance of Elements in the Earth's Crust and in the Sea, in Lide, David R. (ed.), CRC Handbook of Chemistry and Physics, 85th Edition. CRC Press. Boca Raton, Florida (2005).
  32. ^ a b c Hammond, C. R. "Radium" in Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. ISBN 1-4398-5511-0.
  33. ^
  34. ^
  35. ^ Stwertka, Albert (1998). A Guide to the Elements (revised ed.). Oxford University Press. p. 194. ISBN 978-0-19-508083-4.
  36. ^ Frank Moore Colby; Allen Leon Churchill (1911). New International Yearbook: A Compendium of the World's Progress. Dodd, Mead and Co. p. 152 ff.
  37. ^ Curie, Marie & Debierne, André (1910). "Sur le radium métallique" [On metallic radium]. Comptes Rendus (in French). 151: 523–525. Archived from the original on 20 July 2011. Retrieved 1 August 2009.
  38. ^ Mellor, J. W. (1929). A Comprehensive Treatise on Inorganic and Theoretical Chemistry (PDF). Longmans, Green and Co. Ltd. p. 64.
  39. ^ Fair, H. D.; Walker, R. F. (1977). Energetic Materials. New York, NY: Springer. pp. 41–42. ISBN 978-1-4899-5009-3.
  40. ^ Ronneau, C.; Bitchaeva, O. (1997). Biotechnology for waste management and site restoration: Technological, educational, business, political aspects. Scientific Affairs Division, North Atlantic Treaty Organization. p. 206. ISBN 978-0-7923-4769-9. Archived from the original on 5 September 2015. Retrieved 27 June 2015.
  41. ^ Adams, A (January 1993). "The origin and early development of the Belgian radium industry". Environment International. 19 (5): 491–501. doi:10.1016/0160-4120(93)90274-l. ISSN 0160-4120.
  42. ^ Frame, Paul W. (October–November 1996). "How the Curie came to be". Health Physics Society Newsletter. Archived from the original on 20 March 2012. Retrieved 9 May 2023 – via Oak Ridge Associated Universities (orau.org).{{cite magazine}}: CS1 maint: unfit URL (link)
  43. ^ National Research Council (US) Committee on Evaluation of EPA Guidelines for Exposure to Naturally Occurring Radioactive Materials (1999). "Appendix, Radiation Quantities and Units, Definitions, Acronyms". Evaluation of Guidelines for Exposures to Technologically Enhanced Naturally Occurring Radioactive Materials. Washington (DC): National Academies Press (US).
  44. ^ a b Terrill, J.G. Jr.; Ingraham, S.C., 2nd; Moeller, D.W. (1954). "Radium in the healing arts and in industry: Radiation exposure in the United States". Public Health Reports. 69 (3): 255–262. doi:10.2307/4588736. JSTOR 4588736. PMC 2024184. PMID 13134440.{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
  45. ^ a b
  46. ^ Frame, Paul (1999). "Radioluminescent paint". Museum of Radiation and Radioactivity. Oak Ridge Associated Universities. Archived from the original on 31 July 2014.
  47. ^ "Environmental history timeline – Radium Girls". 20 July 2012. Archived from the original on 2 September 2018. Retrieved 1 September 2018.
  48. ^
  49. ^ Lavrukhina, Avgusta Konstantinovna; Pozdnyakov, Aleksandr Aleksandrovich (1966). Аналитическая химия технеция, прометия, астатина и франция [Analytical Chemistry of Technetium, Promethium, Astatine, and Francium] (in Russian). Nauka. p. 118.
  50. ^ a b Zerriffi, Hisham (January 1996). "Tritium: The environmental, health, budgetary, and strategic effects of the Department of Energy's decision to produce tritium". Institute for Energy and Environmental Research. Archived from the original on 13 July 2010. Retrieved 15 September 2010.
  51. ^ "Physical and Chemical Properties of Tritium" (PDF). Nuclear Regulatory Commission. Retrieved 25 October 2024.
  52. ^ Hinderer, James Howard (2010). Radioisotopic Impurities in Promethium-147 Produced at the ORNL High Flux Isotope Reactor (Master's thesis). University of Tennessee.
  53. ^ Hydrogen-3 (PDF) (Report). Nuclide safety data sheet. Environmental Health & Safety Office, Emory University. Archived from the original (PDF) on 20 May 2013 – via ehso.emory.edu.
  54. ^ a b c Emsley 2003, p. 351.
  55. ^ "Could your collectible item contain radium?". Canadian Nuclear Safety Commission. 27 May 2024. Retrieved 22 October 2024.
  56. ^ Díaz Díaz, R.M.; Garrido Gutiérrez, C.; Maldonado Cid, P. (December 2020). "Radioactive Cosmetics and Radiant Beauty". Actas Dermo-Sifiliográficas (English Edition). 111 (10): 863–865. doi:10.1016/j.adengl.2020.09.014.
  57. ^ Prisco, Jacopo (3 March 2020). "When beauty products were radioactive". CNN. Retrieved 13 October 2024.
  58. ^ Morinaga, H.; Mifune, M.; Furuno, K. (1984). "Radioactivity of water and air in Misasa Spa, Japan". Radiation Protection Dosimetry. 7 (1–4): 295–297. doi:10.1093/oxfordjournals.rpd.a083014. ISSN 0144-8420 – via International Nuclear Information System.
  59. ^
  60. ^ Hayter, Charles (2005). "The politics of radon therapy in the 1930s". An Element of Hope: Radium and the response to cancer in Canada, 1900–1940. McGill-Queen's Press. ISBN 978-0-7735-2869-7 – via Google Books.
  61. ^ Harvie, David I. (1999). "The radium century". Endeavour. 23 (3): 100–105. doi:10.1016/S0160-9327(99)01201-6. PMID 10589294.
  62. ^ Van Dyk, J.; Battista, J. J.; Almond, P. R. (2020). "A RETROSPECTIVE OF COBALT-60 RADIATION THERAPY: "THE ATOM BOMB THAT SAVES LIVES"" (PDF). Medical Physics International.
  63. ^ Ronckers, Cécile M; Land, Charles E; Hayes, Richard B; Verduijn, Pieter G; Stovall, Marilyn; van Leeuwen, Flora E (December 2002). "Late Health Effects of Childhood Nasopharyngeal Radium Irradiation: Nonmelanoma Skin Cancers, Benign Tumors, and Hormonal Disorders". Pediatric Research. 52 (6): 850–858. doi:10.1203/00006450-200212000-00007. ISSN 0031-3998.
  64. ^ CDC (20 February 2024). "Facts About Nasopharyngeal Radium Irradiation (NRI)". Radiation and Your Health. Retrieved 13 October 2024.
  65. ^ Hamilton, Vivien (2016). "The Secrets of Life: Historian Luis Campos resurrects radium's role in early genetics research". Distillations. 2 (2): 44–45. Archived from the original on 23 March 2018. Retrieved 22 March 2018.
  66. ^ a b Ceranski, Beate (2008). "Tauschwirtschaft, Reputationsökonomie, Bürokratie". NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin (in German). 16 (4): 413–443. doi:10.1007/s00048-008-0308-z.
  67. ^ Hon. R. J. Strutt (1904). The Becquerel rays and the properties of radium. London: Edward Arnold. – via "Lateral Science" Archived 2 April 2015 at the Wayback Machine. lateralscience.blogspot.se. November 2012
  68. ^ a b "Production, Import, Use and Disposal". Toxicological Profile for Radium. Atlanta (GA): Agency for Toxic Substances and Disease Registry (US). 4 December 1990.
  69. ^ Kuebel, A. (1940). "Extraction of radium from Canadian pitchblende". Journal of Chemical Education. 17 (9): 417. Bibcode:1940JChEd..17..417K. doi:10.1021/ed017p417.
  70. ^ Emsley 2003, p. 437.
  71. ^ Cantrill, Vikki (20 July 2018). "The realities of radium". Nature Chemistry. 10 (8): 898. doi:10.1038/s41557-018-0114-8. ISSN 1755-4330.
  72. ^
  73. ^
  74. ^
  75. ^ Nuñez Portela, M.; Dijck, E.A.; Mohanty, A.; Bekker, H.; van den Berg, J.E.; Giri, G.S.; et al. (1 January 2014). "Ra+ ion trapping: toward an atomic parity violation measurement and an optical clock". Applied Physics B. 114 (1): 173–182. Bibcode:2014ApPhB.114..173N. doi:10.1007/s00340-013-5603-2. S2CID 119948902 – via Springer Link.
  76. ^ Holliman, C.A.; Fan, M.; Contractor, A.; Brewer, S.M.; Jayich, A.M. (20 January 2022). "Radium ion optical clock". Physical Review Letters. 128 (3): 033202. arXiv:2201.07330. Bibcode:2022PhRvL.128c3202H. doi:10.1103/PhysRevLett.128.033202. PMID 35119894. S2CID 246035333 – via APS.
  77. ^
  78. ^ "Xofigo Summary of Product Characteristics" (PDF). European Medicines Authority. Bayer. 11 October 2018. Retrieved 9 October 2019.
  79. ^
  80. ^ Maffioli, L.; Florimonte, L.; Costa, D.C.; Correia Castanheira, J.; Grana, C.; Luster, M.; et al. (2015). "New radiopharmaceutical agents for the treatment of castration-resistant prostate cancer". Q J Nucl Med Mol Imaging. 59 (4): 420–438. PMID 26222274.
  81. ^ Stoll, Wolfgang (2005). "Thorium and Thorium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH. p. 717. doi:10.1002/14356007.a27_001. ISBN 978-3-527-31097-5.
  82. ^ l'Annunziata, Michael F. (2007). "Alpha particle induced nuclear reactions". Radioactivity: Introduction and history. Elsevier. pp. 260–261. ISBN 978-0-444-52715-8.
  83. ^ Holden, N.E.; Reciniello, R.N.; Hu, J.P.; Rorer, David C. (2004). "Radiation dosimetry of a graphite moderated radium-beryllium source" (PDF). Health Physics. 86 (5 Supplement): S110–S112. Bibcode:2003rdtc.conf..484H. doi:10.1142/9789812705563_0060. PMID 15069300. Archived (PDF) from the original on 23 July 2018. Retrieved 25 October 2017.
  84. ^ a b Keller, Wolf & Shani 2011, pp. 96–98.
  85. ^ Redniss, Lauren (2011). Radioactive: Marie & Pierre Curie: A tale of love and fallout. New York, NY: HarperCollins. p. 70. ISBN 978-0-06-135132-7.
  86. ^ "Aplastic Anemia". National Stem Cell Foundation. Archived from the original on 27 May 2022. Retrieved 25 October 2024.
  87. ^ Butler, D. (14 September 1995). "X-rays, not radium, may have killed Curie". Nature. 377 (6545): 96. Bibcode:1995Natur.377...96.. doi:10.1038/377096b0. PMID 7675094. S2CID 186242763.
  88. ^ Coppes-Zantinga, Arty R.; Coppes, Max J. (1 December 1998). "The early years of radiation protection: a tribute to Madame Curie" (PDF). CMAJ. 159 (11).
  89. ^ Gottfried, KLD; Penn, G, eds. (1996). "History of Radiation Regulation in Medicine". Radiation In Medicine: A Need For Regulatory Reform. Washington (DC): National Academies Press (US).
  90. ^ Clarke, R.H.; Valentin, J. (2009). "The History of ICRP and the Evolution of its Policies" (PDF). Annals of the ICRP.
  91. ^ "7. Regulations and Advisories". Toxicological Profile for Radium. Atlanta (GA): Agency for Toxic Substances and Disease Registry (US). 7 December 1990.
  92. ^ "Naturally-Occurring Radioactive Materials (NORM)". World Nuclear Association. 29 April 2024.
  93. ^ "International Basic Safety Standards: General Safety Requirements Part 3" (PDF), Radiation Protection and Safety of Radiation Sources, IAEA, July 2014, doi:10.61092/iaea.u2pu-60vm
  94. ^ "ARAO successfully exports Ra-226 to Canada". ARAO Radioactive Waste Management. 29 July 2024.
  95. ^ "Canada to turn radioactive sources from Thailand into cancer treatments". World Nuclear News. 24 July 2024.
  96. ^ Evans, Melissa; Dahse, Zoe (5 April 2024). "IAEA Enables Safe Management of Radium-226 Legacy Sources". IAEA.
  97. ^ EPA Facts about Radium (PDF). semspub.epa.gov (Report). U.S. Environmental Protection Agency. Retrieved 6 March 2023.
  98. ^
  99. ^ "Ionizing Radiation". Occupational Safety and Health Administration. Retrieved 13 August 2024.
  100. ^ "Frequently Asked Questions (FAQs) Regarding Radium-226" (PDF). U.S. Nuclear Regulatory Commission. October 2008. Retrieved 12 October 2024.
  101. ^ "Legal frameworks for nuclear activities". Nuclear Energy Agency (NEA). Retrieved 22 October 2024.
  102. ^ Kang, Keon Wook (February 2016). "History and Organizations for Radiological Protection". Journal of Korean Medical Science. 31 Suppl 1 (Suppl 1): S4–5. doi:10.3346/jkms.2016.31.S1.S4. ISSN 1598-6357. PMC 4756341. PMID 26908987.
  103. ^ Al Khatibeh, Ahmad; Dojcanova, Lenka (31 July 2017). "IAEA Supports African Countries to Strengthen Regulatory Infrastructure". www.iaea.org. Retrieved 22 October 2024.
  104. ^ Aksenova, Nataliia; Troubat, Alix (12 August 2024). "Enhancing the Nuclear Legal Framework of the Republic of the Congo". www.iaea.org. Retrieved 22 October 2024.

Bibliography

Further reading

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