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Area Radiology and radiological physics / Ionizing radiations : quantities and units

IEV ref881-04-41

Symbol
λ

en
decay constant
disintegration constant
for a radionuclide, the probability per unit time for the spontaneous decay if one of its nuclei. It is given by:

λ= 1 N dN dt MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabeU7aSjabg2da9iabgkHiTmaalaaabaGaaGymaaqaaiaad6eaaaGaeyyXIC9aaSaaaeaacaqGKbGaamOtaaqaaiaabsgacaWG0baaaaaa@4087@

in which N is the number of nuclei of concern existing at time t


fr
constante de désintégration, f
constante radioactive, f
probabilité par unité de temps pour que le noyau d'un radionucléide se désintègre spontanément. Elle est donnée par:

λ= 1 N dN dt MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabeU7aSjabg2da9iabgkHiTmaalaaabaGaaGymaaqaaiaad6eaaaGaeyyXIC9aaSaaaeaacaqGKbGaamOtaaqaaiaabsgacaWG0baaaaaa@4087@

N est le nombre de noyaux existant à l'instant t


ar
ثابت الاضمحلال

es
constante de desintegración

it
costante di decadimento

ko
붕괴 상수

ja
崩壊定数
減衰定数

pl
stała rozpadu
stała zaniku promieniowania

pt
constante de declínio
constante de desintegração

sv
sönderfallskonstant

Publication date: 1983-01
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