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Radium
Radium
is a chemical element with 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) on exposure to air, forming a black surface layer of radium nitride (Ra3N2). All isotopes of radium are highly radioactive, with the most stable isotope being radium-226, which has a half-life of 1600 years and decays into radon gas (specifically the isotope radon-222). When radium decays, ionizing radiation is a product, which can excite fluorescent chemicals and cause radioluminescence. Radium, in the form of radium chloride, was discovered by Marie and Pierre Curie
Pierre Curie
in 1898. They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later. Radium
Radium
was isolated in its metallic state by Marie Curie
Marie Curie
and André-Louis Debierne through the electrolysis of radium chloride in 1911.[1] In nature, radium is found in uranium and (to a lesser extent) thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite. Radium
Radium
is not necessary for living organisms, and adverse health effects are likely when it is incorporated into biochemical processes because of its radioactivity and chemical reactivity. Currently, other than its use in nuclear medicine, radium has no commercial applications; formerly, it was used as a radioactive source for radioluminescent devices and also in radioactive quackery for its supposed curative powers. Today, these former applications are no longer in vogue because radium's toxicity has since become known, and less dangerous isotopes are used instead in radioluminescent devices.

Contents

1 Bulk properties 2 Isotopes 3 Chemistry

3.1 Compounds

4 Occurrence 5 History

5.1 Historical applications

5.1.1 Luminescent paint 5.1.2 Commercial use 5.1.3 Medical use

6 Production 7 Modern applications 8 Hazards 9 See also 10 Notes 11 References 12 Bibliography 13 Further reading 14 External links

Bulk properties[edit] Radium
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.[2] Pure radium is a volatile silvery-white metal, although its lighter congeners calcium, strontium, and barium have a slight yellow tint.[2] Its color rapidly vanishes in air, yielding a black layer of radium nitride (Ra3N2).[3] 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). Both of these values are slightly lower than those of barium, confirming periodic trends down the group 2 elements.[4] 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.[5] Radium
Radium
has a density of 5.5 g/cm3, higher than that of barium, again confirming periodic trends; the radium-barium density ratio is comparable to the radium-barium atomic mass ratio,[6] due to the two elements' similar crystal structures.[6][7] Isotopes[edit] Main article: Isotopes of radium

Decay chain
Decay chain
of 238U, the primordial progenitor of 226Ra

Radium
Radium
has 33 known isotopes, with mass numbers from 202 to 234: all of them are radioactive.[8] 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.[9] Together with the artificial 225Ra (15 d), these are the five most stable isotopes of radium.[9] All other known radium isotopes have half-lives under two hours, and the majority have half-lives under a minute.[8] At least 12 nuclear isomers have been reported; the most stable of them is radium-205m, with a half-life of between 130 and 230 milliseconds, which is still shorter than twenty-four ground-state radium isotopes.[8] In the early history of the study of radioactivity, the different natural isotopes of radium were given different names. In this scheme, 223Ra was named actinium X (AcX), 224Ra thorium X (ThX), 226Ra radium (Ra), and 228Ra mesothorium 1 (MsTh1).[9] When it was realized that all of these are isotopes of the same element, many of these names fell out of use, and "radium" came to refer to all isotopes, not just 226Ra.[9] Some of radium-226's decay products received historical names including "radium", ranging from radium A to radium G, with the letter indicating approximately how far they were down the chain from their parent 226Ra.[9] 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, which is responsible for much of the danger of environmental radium.[10] 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.[11][12] A sample of radium metal maintains itself at a higher temperature than its surroundings because of the radiation it emits – alpha particles, beta particles, and gamma rays. More specifically, 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.[13] Chemistry[edit] Radium, like barium, is a highly reactive metal and always exhibits its group oxidation state of +2.[3] It forms the colorless Ra2+ cation in aqueous solution, which is highly basic and does not form complexes readily.[3] Most radium compounds are therefore simple ionic compounds,[3] 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.[14] 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).[15] The values for barium and radium are almost exactly the same as those of the heavier alkali metals potassium, rubidium, and caesium.[15] Compounds[edit] Solid
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.[3] Insoluble radium compounds coprecipitate with all barium, most strontium, and most lead compounds.[16] Radium
Radium
oxide (RaO) has not been characterized well past its existence, despite oxides being common compounds for the other alkaline earth metals. Radium
Radium
hydroxide (Ra(OH)2) is the most readily soluble among the alkaline earth hydroxides and is a stronger base than its barium congener, barium hydroxide.[17] It is also more soluble than actinium hydroxide and thorium hydroxide: these three adjacent hydroxides may be separated by precipitating them with ammonia.[17] Radium chloride
Radium chloride
(RaCl2) is a colorless, luminous 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.[17] 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.[17] Radium bromide
Radium bromide
(RaBr2) is also a colorless, luminous compound.[17] 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, with builds up inside and weakens radium bromide crystals. This effect sometimes causes the crystals to break or even explode.[17] Radium
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.[17] Radium
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.[18] 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.[19] The large ionic radius of Ra2+ (148 pm) results in weak complexation and poor extraction of radium from aqueous solutions when not at high pH.[20] Occurrence[edit] 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
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, these daughters are continually being regenerated by their decay.[9] 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.[21] 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.[22] One kilogram of the Earth's crust
Earth's crust
contains about 900 picograms of radium, and one liter of sea water contains about 89 femtograms of radium.[23] History[edit]

Marie and Pierre Curie
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.

Further information: Marie Curie
Marie Curie
§ New elements Radium
Radium
was discovered by Marie Sklodowska- Curie and her husband Pierre Curie on 21 December 1898, in a uraninite (pitchblende) sample.[24] While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive. They separated out an element similar to bismuth from pitchblende in July 1898, that turned out to be polonium. They then separated out a radioactive mixture consisting mostly 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 that they were more insoluble. This made it possible for the Curies to separate out the radioactive compounds and discover a new element in them. The Curies announced their discovery to the French Academy of Sciences
French Academy of Sciences
on 26 December 1898.[25][26] 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 power of emitting energy in the form of rays.[27][28][29] In 1910, radium was isolated as a pure metal by Marie Curie
Marie Curie
and André-Louis Debierne through the electrolysis of a pure radium chloride (RaCl2) solution using a mercury cathode, producing a radium–mercury amalgam. This amalgam was then heated in an atmosphere of hydrogen gas to remove the mercury, leaving pure radium metal.[30] The same year, E. Eoler isolated radium by thermal decomposition of its azide, Ra(N3)2.[9] Radium
Radium
metal was first industrially produced in the beginning of the 20th century by Biraco, a subsidiary company of Union Minière du Haut Katanga
Union Minière du Haut Katanga
(UMHK) in its Olen plant in Belgium.[31] The common historical unit for radioactivity, the curie, is based on the radioactivity of 226Ra.[32] Historical applications[edit] Luminescent paint[edit]

Self-luminous white paint which contains radium on the face and hand of an old clock.

Radium
Radium
watch hands under ultraviolet light

Radium
Radium
was formerly used in self-luminous paints for watches, nuclear panels, aircraft switches, clocks, and instrument dials. A typical self-luminous watch that uses radium paint contains around 1 microgram of radium.[33] In the mid-1920s, a lawsuit was filed against the United States Radium Corporation
United States Radium Corporation
by five dying " Radium
Radium
Girls" dial painters who had painted radium-based luminous paint on the dials of watches and clocks. The dial painters routinely licked their brushes to give them a fine point, thereby ingesting radium.[34] Their exposure to radium caused serious health effects which included sores, anemia, and bone cancer. This is because radium is treated as calcium by the body, and deposited in the bones, where radioactivity degrades marrow and can mutate bone cells.[35] 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, yet had not seen fit 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
Radium Girls
were instead suffering from syphilis. This complete disregard for employee welfare had a significant impact on the formulation of occupational disease labor law.[36] As a result of the lawsuit, the adverse effects of radioactivity became widely known, and radium-dial painters were instructed in proper safety precautions and provided with protective gear. In particular, dial painters no longer licked paint brushes to shape them (which caused some ingestion of radium salts). Radium
Radium
was still used in dials as late as the 1960s, but there were no further injuries to dial painters. This highlighted that the harm to the Radium
Radium
Girls could easily have been avoided.[37] 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.[35] 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 today.[38] These had the added advantage of not degrading the phosphor over time, unlike radium.[39] Tritium
Tritium
emits very low-energy beta radiation (even lower-energy than the beta radiation emitted by promethium)[8] which cannot penetrate the skin,[40] rather than the penetrating gamma radiation of radium and is regarded as safer.[41] 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; however, 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.[42] The appearance of an often thick layer of green or yellowish brown paint in devices from this period suggests a radioactive hazard. The radiation dose from an intact device is relatively low and usually not an acute risk; but the paint is dangerous if released and inhaled or ingested.[43][44] Commercial use[edit]

Hotel postcard advertising radium baths, c.1940s

Main article: Radioactive
Radioactive
quackery Radium
Radium
was once an additive in products such as toothpaste, hair creams, and even food items due to its supposed curative powers.[45] 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
Radithor
or Revigator
Revigator
types of " Radium
Radium
water" or "Standard Radium
Radium
Solution for Drinking".)[42] Spas featuring radium-rich water are still occasionally touted as beneficial, such as those in Misasa, Tottori, Japan. In the U.S., nasal radium irradiation was also administered to children to prevent middle-ear problems or enlarged tonsils from the late 1940s through the early 1970s.[46] Medical use[edit] Radium
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; for example, several of these radon sources were used in Canada in the 1920s and 1930s.[43][47] 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.[48] Safer gamma emitters such as 60Co, which is less costly and available in larger quantities, are usually used today to replace the historical use of radium in this application.[20] 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
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.[49] Howard Atwood Kelly, one of the founding physicians of Johns Hopkins Hospital, was a major pioneer in the medical use of radium to treat cancer.[50] His first patient was his own aunt in 1904, who died shortly after surgery.[51] Kelly was known to use excessive amounts of radium to treat various cancers and tumors. As a result, some of his patients died from radium exposure.[52] His method of radium application was inserting a radium capsule near the affected area, then sewing the radium "points" directly to the tumor.[52] This was the same method used to treat Henrietta Lacks, the host of the original HeLa cells, for cervical cancer.[53] Currently, safer and more available radioisotopes are used instead.[35] Production[edit] Uranium
Uranium
had no large scale application in the late 19th century and therefore no large uranium mines existed. In the beginning the only large source for uranium ore was the silver mines in Joachimsthal, Austria-Hungary
Austria-Hungary
(now Jáchymov, Czech Republic).[24] The uranium ore was only a byproduct of the mining activities.[54] 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 remove as much as possible 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 are reprecipitated as sulfates and this was repeated one or few times, for further purification of 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 sulfate were pure enough they were once more converted to mixed chloride and barium and radium 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.[55] After the isolation of radium by Marie and Pierre Curie
Pierre Curie
from uranium ore from Joachimsthal several scientists started to isolate radium in small quantities. Later small companies purchased mine tailings from Joachimsthal mines and started isolating radium. In 1904 the Austrian government nationalised the mines and stopped exporting raw ore. For some time the radium availability was low.[54] 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. The Carnotite
Carnotite
sands in Colorado
Colorado
provide some of the element, but richer ores are found in the Congo and the area of the Great Bear Lake
Great Bear Lake
and the Great Slave Lake
Great Slave Lake
of northwestern Canada.[24][56] Neither of the deposits is mined for radium but the uranium content makes mining profitable. The Curies' process was still used for industrial radium extraction in 1940, but mixed bromides were then used for the fractionation.[57] If the barium content of the uranium ore is not high enough it is easy to add some to carry the radium. These processes were applied to high grade uranium ores but may not work well with low grade ores. Small amounts of radium were still extracted from uranium ore by this method of mixed precipitation and ion exchange as late as the 1990s,[21] but today they are extracted only from spent nuclear fuel.[58] In 1954, the total worldwide supply of purified radium amounted to about 5 pounds (2.3 kg)[33] and it is still in this range today, while the annual production of pure radium compounds is only about 100 g in total today.[21] The chief radium-producing countries are Belgium, Canada, the Czech Republic, Slovakia, the United Kingdom, and Russia.[21] The amounts of radium produced were and are always relatively small; for example, in 1918, 13.6 g of radium were produced in the United States. [59] The metal is isolated by reducing radium oxide with aluminium metal in a vacuum at 1200 °C.[20] Modern applications[edit] 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.[60][61] The isotope 223Ra (under the trade name Xofigo) was approved by the United States Food and Drug Administration
Food and Drug Administration
in 2013 for use in medicine as a cancer treatment of bone metastasis.[62][63] The main indication of treatment with Xofigo
Xofigo
is the therapy of bony metastases from castration-resistant prostate cancer due to the favourable characteristics of this alpha-emitter radiopharmaceutical.[64] 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.[65] Radium
Radium
is still used today as a radiation source in some industrial radiography devices to check for flawed metallic parts, similarly to X-ray imaging.[35] When mixed with beryllium, radium acts as a neutron source.[42][66] Radium-beryllium neutron sources are still sometimes used even today,[35][67] but other materials such as polonium are now more common: about 1500 polonium-beryllium neutron sources, with an individual activity of 1,850 Ci (68 TBq), have been used annually in Russia.[68] These 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.[20] Today, the isotope 226Ra is mainly used to form 227Ac by neutron irradiation in a nuclear reactor.[20] Hazards[edit] Radium
Radium
is highly radioactive and its immediate daughter, radon gas, is also radioactive. 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.[35] 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.[35] At the time of the Manhattan Project
Manhattan Project
in 1944, the "tolerance dose" for workers was set at 0.1 micrograms of ingested radium.[69][70] Some of the biological effects of radium were apparent from the start. The first case of so-called "radium-dermatitis" was reported in 1900, only 2 years after the element's discovery. The French physicist Antoine Becquerel
Antoine Becquerel
carried a small ampoule of radium in his waistcoat pocket for 6 hours and reported that his skin became ulcerated. Pierre and Marie Curie
Marie Curie
were so intrigued by radiation that they sacrificed their own health to learn more about it. Pierre Curie
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.[71] Handling of radium has been blamed for Marie Curie's death due to aplastic anemia. A significant amount of radium's danger comes from its daughter radon: being a gas, it can enter the body far more readily than can its parent radium.[35] Today, 226Ra is considered to be the most toxic of the quantity radioelements, and it must be handled in tight glove boxes with significant airstream circulation that is then treated to avoid escape of its daughter 222Rn to the environment. Old ampoules containing radium solutions must be opened with care because radiolytic decomposition of water can produce an overpressure of hydrogen and oxygen gas.[20] See also[edit]

Books View or order collections of articles

Radium Period 7 elements Alkaline earth metals Chemical elements (sorted alphabetically) Chemical elements (sorted by number)

Portals Access related topics

Chemistry portal Medicine
Medicine
portal

Notes[edit]

^ Both values are encountered in sources and there is no agreement among scientists as to the true value of the melting point of radium.

References[edit]

^ "Radium". Royal Society of Chemistry.  ^ a b Greenwood and Earnshaw, p. 112 ^ a b c d e Kirby et al., p. 4 ^ Lide, D. R. (2004). CRC Handbook of Chemistry and Physics
CRC Handbook of Chemistry and Physics
(84th ed.). Boca Raton (FL): CRC Press. ISBN 978-0-8493-0484-2.  ^ Weigel, F.; Trinkl, A. (1968). "Zur Kristallchemie des Radiums". Radiochim. Acta. 10: 78. doi:10.1524/ract.1968.10.12.78.  ^ a b Young, David A. (1991). "Radium". Phase Diagrams of the Elements. University of California Press. p. 85. ISBN 0-520-91148-2.  ^ "Crystal Structures of the Chemical Elements at 1 bar". uni-bielefeld.de. ^ a b c d G. Audi; A. H. Wapstra; C. Thibault; J. Blachot & O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.  ^ a b c d e f g Kirby et al., p. 3 ^ Radium
Radium
– Radiation Protection. United States Environmental Protection Agency. ^ Soddy, Frederick (25 August 2004). The Interpretation of Radium. pp. 139–. ISBN 978-0-486-43877-1.  ^ Malley, Marjorie C. (2011). Radioactivity. Oxford University Press. pp. 115–. ISBN 978-0-19-983178-4.  ^ Strutt, R. J. (7 September 2004). The Becquerel Rays and the Properties of Radium. pp. 133–. ISBN 978-0-486-43875-7.  ^ Thayer, John S. (2010). "Relativistic Effects and the Chemistry of the Heavier Main Group Elements": 81. doi:10.1007/978-1-4020-9975-5_2.  ^ a b Greenwood and Earnshaw, p. 111 ^ Kirby et al., p. 8 ^ a b c d e f g Kirby et al., pp. 4–8 ^ Kirby et al., pp. 8–9 ^ Kirby et al., p. 12 ^ a b c d e f Ullmann, pp. 97–98 ^ a b c d Greenwood and Earnshaw, pp. 109–110 ^ "Radium", Los Alamos National Laboratory. Retrieved 5 August 2009. ^ 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). ^ 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 1439855110.  ^ Curie, Pierre; Curie, Marie & Bémont, Gustave (1898). "Sur une nouvelle substance fortement radio-active, contenue dans la pechblende (On a new, strongly radioactive substance contained in pitchblende)". Comptes Rendus. 127: 1215–1217. Retrieved 1 August 2009.  ^ Weeks, Mary Elvira (1933). "The discovery of the elements. XIX. The radioactive elements". Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.  ^ Ball, David W. (1985). "Elemental etymology: What's in a name?" (PDF). Journal of Chemical Education. 62: 787–788. Bibcode:1985JChEd..62..787B. doi:10.1021/ed062p787.  ^ Carvalho, Fernando P. (2011). " Marie Curie
Marie Curie
and the Discovery of Radium": 3–13. doi:10.1007/978-3-642-22122-4_1.  ^ Weeks, Mary Elvira (1933). "The discovery of the elements. XIX. The radioactive elements". Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.  ^ Curie, Marie & Debierne, André (1910). "Sur le radium métallique" (On metallic radium)". Comptes Rendus (in French). 151: 523–525. Retrieved 1 August 2009.  ^ 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.  ^ Frame, Paul W. "How the Curie Came to Be". Retrieved 30 April 2008.  ^ a b Terrill Jr, J. G.; Ingraham Sc, 2nd; Moeller, D. W. (1954). " Radium
Radium
in the healing arts and in industry: Radiation exposure in the United States". Public Health Reports. 69 (3): 255–62. doi:10.2307/4588736. PMC 2024184 . PMID 13134440.  ^ Frame, Paul. Radioluminescent
Radioluminescent
Paint, Oak Ridge Associated Universities. Retrieved September 17, 2007. ^ a b c d e f g h Radium: Radiation Protection – US EPA ^ "Environmental history timeline – Radium
Radium
Girls". Retrieved 29 December 2014.  ^ Rowland, R. E. (1995) Radium
Radium
in humans: a review of U.S. studies. Argonne National Laboratory. p. 22 ^ Tykva, Richard; Berg, Dieter (2004). Man-made and natural radioactivity in environmental pollution and radiochronology. Springer. p. 78. ISBN 1-4020-1860-6.  ^ Lavrukhina, A. K.; Pozdnyakov, A. A. (1966). Аналитическая химия технеция, прометия, астатина и франция [Analytical Chemistry of Technetium, Promethium, Astatine, and Francium] (in Russian). Nauka. p. 118.  ^ Nuclide safety data sheet: Hydrogen-3. ehso.emory.edu ^ 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. Retrieved 15 September 2010.  ^ a b c Emsley, John (2003). Nature's building blocks: an A-Z guide to the elements. Oxford University Press. pp. 351–. ISBN 978-0-19-850340-8.  ^ a b radium. Encyclopædia Britannica ^ Luminous Radium
Radium
Paint. vintagewatchstraps.com ^ "French Web site featuring products (medicines, mineral water, even underwear) containing radium". Retrieved 1 August 2009.  ^ Cherbonnier, Alice (1 October 1997). "Nasal Radium
Radium
Irradiation of Children Has Health Fallout". Baltimore Chronicle. Retrieved 1 August 2009.  ^ Hayter, Charles (2005). "The Politics of Radon
Radon
Therapy in the 1930s". An Element of Hope: Radium
Radium
and the Response to Cancer
Cancer
in Canada, 1900–1940. McGill-Queen's Press. ISBN 978-0-7735-2869-7.  ^ Harvie, David I. (1999). "The radium century". Endeavour. 23 (3): 100–5. doi:10.1016/S0160-9327(99)01201-6. PMID 10589294.  ^ Hamilton, Vivien (2016). "The Secrets of Life: Historian Luis Campos resurrects radium's role in early genetics research". Distillations. 2 (2): 44–45. Retrieved 22 March 2018.  ^ "The Four Founding Physicians". Retrieved 10 April 2013.  ^ Dastur, Adi E.; Tank, P. D. (2011). "Howard Atwood Kelly: much beyond the stitch". The Journal of Obstetrics and Gynecology of India. 60 (5): 392–394. doi:10.1007/s13224-010-0064-6. PMC 3394615 .  ^ a b Aronowitz, Jesse N.; Robison, Roger F. (2010). "Howard Kelly establishes gynecologic brachytherapy in the United States". Brachytherapy. 9 (2): 178–184. doi:10.1016/j.brachy.2009.10.001. PMID 20022564.  ^ Rebecca Skloot (2 February 2010). The Immortal Life of Henrietta Lacks. Random House Digital, Inc. ISBN 978-0-307-58938-5. Retrieved 8 April 2013.  ^ a b Ceranski, Beate (2008). "Tauschwirtschaft, Reputationsökonomie, Bürokratie". NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin. 16 (4): 413–443. doi:10.1007/s00048-008-0308-z.  ^ "Lateral Science". lateralscience.blogspot.se. November 2012 ^ Just, Evan; Swain, Philip W. & Kerr, William A. (1952). "Peacetíme Impact of Atomíc Energy". Financial Analysts Journal. 8 (1): 85–93. doi:10.2469/faj.v8.n1.85. JSTOR 40796935.  ^ Kuebel, A. (1940). "Extraction of radium from Canadian pitchblende". Journal of Chemical Education. 17 (9): 417. Bibcode:1940JChEd..17..417K. doi:10.1021/ed017p417.  ^ Emsley, John (2011). Nature's building blocks: an A-Z guide to the elements. Oxford University Press. p. 437. ISBN 9780199605637.  ^ Viol, C. H. (1919). " Radium
Radium
Production". Science. 49 (1262): 227–8. Bibcode:1919Sci....49..227V. doi:10.1126/science.49.1262.227. PMID 17809659.  ^ Committee On Radiation Source Use And Replacement, National Research Council (U.S.); Nuclear And Radiation Studies Board, National Research Council (U.S.) (January 2008). Radiation source use and replacement: Abbreviated version. p. 24. ISBN 978-0-309-11014-3.  ^ Bentel, Gunilla Carleson (1996). Radiation therapy planning. p. 8. ISBN 978-0-07-005115-7.  ^ "FDA OKs pinpoint prostate cancer radiation drug Xofigo
Xofigo
from Bayer, Algeta". Archived from the original on 2013-05-15.  ^ "FDA Approves Xofigo
Xofigo
for Advanced Prostate Cancer". cancer.org. (2013-05-15) ^ Maffioli, L.; Florimonte, L.; Costa, D. C.; Correia Castanheira, J.; Grana, C.; Luster, M.; Bodei, L.; Chinol, M. (2015). "New radiopharmaceutical agents for the treatment of castration-resistant prostate cancer". Q J Nucl Med Mol Imaging. 59: 420–38. PMID 26222274.  ^ Stoll, Wolfgang (2005). " Thorium
Thorium
and Thorium
Thorium
Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH. p. 717. doi:10.1002/14356007.a27_001. ISBN 978-3-527-31097-5.  ^ l'Annunziata, Michael F. (2007). " Alpha particle
Alpha particle
induced nuclear reactions". Radioactivity: Introduction and history. Elsevier. pp. 260–261. ISBN 978-0-444-52715-8.  ^ 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 Suppl): S110–2. Bibcode:2003rdtc.conf..484H. doi:10.1142/9789812705563_0060. PMID 15069300.  ^ Красивая версия "самоубийства" Литвиненко вследствие криворукости (in Russian). stringer.ru (2006-11-26). ^ Weisgall, Jonathan M. (1994). Operation crossroads: the atomic tests at Bikini Atoll. Naval Institute Press. p. 238. ISBN 978-1-55750-919-2. Retrieved 20 August 2011.  ^ Fry, Shirley A. (1998). "Supplement: Madame Curie's Discovery of Radium
Radium
(1898): A Commemoration by Women in Radiation Sciences". Radiation Research. 150 (5): S21–S29. doi:10.2307/3579805. PMID 9806606.  ^ 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. 

Bibliography[edit]

Kirby, H. W.; Salutsky, Murrell L. (1964). The Radiochemistry of Radium
Radium
(PDF). National Academies Press.  Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.  Keller, Cornelius; Wolf, Walter; Shani, Jashovam (2005), "Radionuclides, 2. Radioactive
Radioactive
Elements and Artificial Radionuclides", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.o22_o15 

Further reading[edit]

Albert Stwertka (1998). Guide to the Elements – Revised Edition. Oxford University Press. ISBN 0-19-508083-1.  Denise Grady (6 October 1998). "A Glow in the Dark, and a Lesson in Scientific Peril". The New York Times. Retrieved 25 December 2007.  Nanny Fröman (1 December 1996). "Marie and Pierre Curie
Pierre Curie
and the Discovery of Polonium
Polonium
and Radium". Nobel Foundation. Retrieved 25 December 2007.  Macklis, R. M. (1993). "The great radium scandal". Scientific American. 269 (2): 94–99. Bibcode:1993SciAm.269b..94M. doi:10.1038/scientificamerican0893-94. PMID 8351514.  Clark, Claudia (1987). Radium
Radium
Girls: Women and Industrial Health Reform, 1910–1935. University of North Carolina Press. ISBN 0-8078-4640-6.  Curie, Marie (1921). The Discovery of Radium. Poughkeepsie: Vassar College. 

External links[edit]

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Definitions from Wiktionary Media from Wikimedia Commons Learning resources from Wikiversity

"Lateral Science: The Discovery of Radium". July 8, 2012. Archived from the original on March 9, 2016. Retrieved 13 May 2017.  Photos of Radium
Radium
Water Bath in Oklahoma NLM Hazardous Substances Databank – Radium, Radioactive Annotated bibliography for radium from the Alsos Digital Library for Nuclear Issues The Poisoner Next Door – Japan Today, 10/20/2001 Radium
Radium
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Periodic table
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4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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2 Li Be

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3 Na Mg

Al Si P S Cl Ar

4 K Ca Sc

Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

5 Rb Sr Y

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6 Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

7 Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og

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