Definition: A unit of measurement of radioactivity, 3.70 ×1010 disintegrations per second; formerly defined as the radioactivity of the amount of radon in equilibrium with 1 g radium; superseded by the S.I. unit, the becquerel (1 disintegration per second).
[Marie (1867–1934) and Pierre (1859–1906) Curie, French chemists and physicists and Nobel laureates]
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