| 释义 |
Becquerel|ˈbɛkrəl|
[The name of a French physicist, Antoine Henri Becquerel (1852–1908).]
1. Used attrib. in Becquerel('s) rays, formerly a general term for the radiation from radioactive substances.
1896S. P. Thompson in Phil. Mag. July 105 While agreeing with the Röntgen rays in the property of penetrating aluminium [etc.], the Becquerel rays differ in the circumstance that they can be refracted and polarized. 1897― Light Visible & Invis. 279 Becquerel's rays possess..the property of diselectrifying charged bodies. 1898Physical Rev. Apr. 239 Becquerel rays, or uranium rays, as Becquerel himself called them. 1931Discovery July 212/2 When X-rays and the Becquerel rays from uranium were discovered it was demonstrated that these rays could make air into a conductor.
2. (Written becquerel.) The SI unit of radioactivity, equal to one disintegration per second (superseding the curie, equal to 3·7 × 1010 becquerels). Symbol Bq.
1975Physics Bull. Mar. 105/1 The CIPM will recommend to the CGPM that the SI unit of activity should be given the name ‘becquerel’, symbol Bq. 1976Sci. Amer. Mar. 60a/2 Among the SI's derived units with special names are those for..radioactivity (the becquerel, or spontaneous nuclear transitions per second) and absorbed dose of radiation (the gray, or joules per kilogram). 1986Times 7 May 7 The Agriculture Minister insisted that his official figures for iodine radiation in milk showed levels up to 60 becquerels a litre, ‘miles below’ the safe limit of 1,000. |