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单词 half-life period
释义

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half-life period
half-life period n. the time taken for the quantity or value of something (esp. radioactivity) to fall to half its original value; cf. sense A. 2.
Π
1907 Jrnl. Chem. Soc. 91 ii. 1281 Rutherford and others have shown that whilst radium A, B, and C have a life-period of only a few hours, radium D has a half-life-period of forty years.
1942 J. D. Stranathan ‘Particles’ of Mod. Physics viii. 326 The half life period T of a radioactive substance is defined as the time required for one half of the active material present at any time to decay.
2008 Wear 265 627/1 The active species must have a half-life period compatible with the duration of the measurement.
extracted from half-lifen.adj.
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