IEVref:881-04-47ID:
Language:enStatus: Standard
Term: mean life
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Symbol: τ
Definition: the average life expectancy of a nucleus of a particular radionuclide which is the time in which the number of nuclei of the radionuclide is reduced to the fraction 1/e (≈ 0,368) of its initial value

NOTE – It is related to the decay constant λ and the half-life T 1 2 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadsfadaWgaaqcba waaSWaaSqaaKGaGfaacaaIXaaabaGaaGOmaaaaaKqaahqaaaaa@397C@ by:

τ= 1 λ = T 1 2 ln2 ≃ T 1 2 0,693 ≃1,433   T 1 2 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaGWaciab=r8a0jabg2da9maalaaabaGaaGymaaqaaiabeU7aSbaacqGH9aqpdaWcaaqaaiaadsfadaWgaaWcbaWaaSqaaWqaaiaaigdaaeaacaaIYaaaaaWcbeaaaOqaaiGacYgacaGGUbGaaGOmaaaacqWIdjYodaWcaaqaaiaadsfadaWgaaWcbaWaaSqaaWqaaiaaigdaaeaacaaIYaaaaaWcbeaaaOqaaiaaicdacaGGSaGaaGOnaiaaiMdacaaIZaaaaiabloKi7iaaigdacaGGSaGaaGinaiaaiodacaaIZaGaaGPaVlaaykW7caWGubWaaSbaaSqaamaaleaameaacaaIXaaabaGaaGOmaaaaaSqabaaaaa@532B@


Publication date:1983-01
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