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radium

(ray-diŭm) a radioactive metallic element that emits alpha and gamma rays during its decay into other elements. The gamma radiation was formerly employed in radiotherapy for the ...

radium

radium n.   Quick reference

Concise Medical Dictionary (10 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Clinical Medicine
Length:
65 words

... n. a radioactive metallic element that emits alpha and gamma rays during its decay into other elements. The gamma radiation was formerly employed in radiotherapy for the treatment of cancer. Because radon , a radioactive gas, is released from radium, the metal was enclosed in gas-tight containers during use. Radium is stored in lead-lined containers, which give protection from the radiation. Symbol:...

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A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
82 words

... (Symbol Ra) . A radioactive metallic element belonging to group 2 (formerly IIA) of the periodic table; a.n. 88; r.a.m. 226.0254; r.d. ~5; m.p. 700°C; b.p. 1140°C. It occurs in uranium ores (e.g. pitchblende). The most stable isotope is radium-226 (half-life 1602 years), which decays to radon. It is used as a radioactive source in research and, to some extent, in radiotherapy. The element was isolated from pitchblende in 1898 by Marie and Pierre Curie . https://www.webelements.com/radium/ Information from the WebElements...

radium

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The Oxford Companion to the History of Modern Science

Reference type:
Subject Reference
Subject:
Science and technology, History of Science
Length:
580 words

...Radium took its place in the alkaline earth group above barium. Later it was assigned an atomic number, 88. In 1910 Marie Curie and André-Louis Debierne isolated metallic radium. Several isotopes of radium were identified after isotopy was recognized around 1913 . Radium's strong radioactivity made new experiments possible, which led to further discoveries and insights. Demand increased for this scarce element, which at first could only be obtained from the Curies and from the German chemist Friedrich Giesel , who barely missed discovering it. Radium's...

radium

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A Dictionary of Nursing (7 ed.)

Reference type:
Subject Reference
Current Version:
2017
Subject:
Medicine and health
Length:
36 words

...radium [ ray -diŭm] n. a radioactive metallic element that emits alpha and gamma rays during its decay into other elements. The gamma radiation was formerly employed in radiotherapy for the treatment of cancer. Symbol: Ra....

radium

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World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
79 words

... ( symbol Ra ) White, radioactive, metallic element of the alkaline-earth metals , first discovered ( 1898 ) in pitchblende by French physicists Pierre and Marie Curie ; the metal is present in uranium ores. It is used in radiotherapy to treat tumours. Radium has 16 isotopes, which emit alpha, beta and gamma radiation, as well as heat. Radon gas is a decay product. Properties: at.no. 88; r.a.m. 226.025; r.d. 5.0; m.p. 700°C (1,292°F); b.p. 1,140°C (2,084°F); most stable isotope Ra 226 (half-life 1622 ...

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A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
76 words

...radium Symbol Ra. A radioactive metallic element belonging to group 2 (formerly IIA) of the periodic table; a.n. 88; r.a.m. 226.0254; r.d. ≊5; m.p. 700°C; b.p. 1140°C. It occurs in uranium ores (e.g. pitchblende). The most stable isotope is radium–226 (half-life 1602 years), which decays to radon. It is used as a radioactive source in research and, to some extent, in radiotherapy. The element was isolated from pitchblende in 1898 by Marie and Pierre Curie...

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A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... ( Ra ) A rare radioactive isotope (radium‐266) which occurs in uranium ores, such as pitchblende , and has a half‐life of 1622 ...

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A Dictionary of Public Health (2 ed.)

Reference type:
Subject Reference
Current Version:
2018

...radium ( Ra ) A metallic element with very high density that has several radioactive isotopes with a half-life as long as 1,600 years, used in radiotherapy and to make luminous paint. Workers in radium mines have a high risk of cancer from exposure to ionized radiation, as did workers with radium salts (used to make luminous paint) until protective measures were applied. The properties of radium were investigated by the French physicist Pierre Curie ( 1859–1906 ) and his Polish wife, Marie Sklodowska Curie ( 1867–1934 ). She received two Nobel Prizes...

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The Concise Oxford Dictionary of English Etymology

Reference type:
Subject Reference
Current Version:
2003
Subject:
Language reference, History of English
Length:
8 words

... XIX. f. L. radius RAY 1 ; see -IUM...

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The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

... Symbol: Ra See also periodic table ; nuclide...

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New Oxford Rhyming Dictionary (2 ed.)

Reference type:
Subject Reference
Current Version:
2013
Subject:
Language reference
Length:
211 words

... • columbium • erbium , terbium, ytterbium • scandium • compendium • palladium , radium, stadium, vanadium • medium , tedium • cryptosporidium , cymbidium, idiom, iridium, rubidium • indium • exordium , Gordium, rutherfordium • odeum , odium, plasmodium, podium, sodium • allium , gallium, pallium, thallium, valium • berkelium , epithelium, helium, nobelium, Sealyham • beryllium , cilium, psyllium, trillium • linoleum , petroleum • thulium • cadmium • epithalamium , prothalamium • freemium , gelsemium, premium • chromium ,...

radium

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The New Zealand Oxford Dictionary

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
107 words
radium

radium noun   Reference library

Australian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2004
Subject:
English Dictionaries and Thesauri
Length:
111 words
radium

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New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
63 words
radium

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Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
67 words
radium

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The Canadian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
32 words
radium emanation

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New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
10 words
radium emanation

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Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
10 words
radium therapy

radium therapy noun   Reference library

The Canadian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
14 words
radium

radium  

Reference type:
Overview Page
(ray-diŭm)a radioactive metallic element that emits alpha and gamma rays during its decay into other elements. The gamma radiation was formerly employed in radiotherapy for the treatment of cancer. ...

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