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IEVref:395-01-11ID:
Language:enStatus: Standard
Term: decay constant
Synonym1:
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Synonym3:
Symbol: λ
Definition: disintegrations per unit time dN/dt for an atomic nucleus divided by the number of nuclei N existing at the same time t

λ= 1 N × dN dt MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiabeU7aSjabg2da9iabgkHiTmaalaaabaGaaGymaaqaaiaad6eaaaGaey41aq7aaSaaaeaacaqGKbGaamOtaaqaaiaabsgacaWG0baaaaaa@4053@

Note 1 to entry: The decay constant is expressed in reciprocal seconds (s−1).

Note 2 to entry: The decay constant may be considered the total probability of radioactive decay (disintegration and/or nuclear transition).

Note 3 to entry: This entry was numbered 393-14-18 in IEC 60050-393:2003.


Publication date:2014-03
Source:ISO 921:1997, definition 282, modified
Replaces:
Internal notes:2015-05-20: Link added to <a href=IEV113-05-21>atomic nucleus</a>. JGO
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