radium

Traductions

• anglais

  Auteur : Office québécois de la langue française, 1987

  Définition

  An element. State: solid; Group: IIA; Atomic No.: 88; Atomic Wt.: 226.0254; Valence: 2. A strongly radioactive metallic element, m.p. 700 °C (1292 °F), occurring in extremely small percentages in uranium ores (pitchblende and carnotite), found in the African Congo, northern Canada, Colorado, and in USSR. It was first isolated in 1898 by the brilliant analytical research of the Curies, Pierre (1859-1906) and Marie (1967-1934), French chemists and physicists, Nobel Prizes 1903 and 1911.

  Notes :

  Detection of the nuclear decay of radium, as indicated by the emanation of alpha, beta, and gamma radiation, was in part responsible for the revolution in physics that occurred between 1895 and 1910, for it had previously been thought that atoms were permanent and indestructible entitles. Radium is a highly dangerous substance and must be kept in heavy lead containers to block off its ionizing radiation. Its major use is in cancer therapy in the form of salts.
  
  By virtue of being an alpha- and gamma-emitter, radium is used as a source of luminescence and as a radiation source in medicine and radiography.

  Termes :

  1. radium
  2. Ra