| 单词 | θ79531 |
| 释义 | the world > matter > physics > atomic nucleus > measurement of ionizing radiation > [noun] > units of radioactivity (11) megacurie1947 curie1954 Originally: a quantity of radon (radon 222, radium emanation) in radioactive equilibrium with one gramme of radium. Later extended to denote an… pico-curie1960 Becquerel1975 (Written becquerel.) The SI unit of radioactivity, equal to one disintegration per second (superseding the curie, equal to 3·7 × 1010 becquerels)… Bq1975 = Becquerel, n. 2. Subcategories:— roentgen unit (2) — as dosage (4) |
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