IEVref:881-04-42ID:
Language:enStatus: Standard
Term: activity
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Symbol: A
Definition: of an amount of a radionuclide in a particular energy state at a given time, the quotient of dN by dt, where dN is the expectation value of the number of spontaneous nuclear transitions from that energy state in the time interval dt:

A= dN dt MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadgeacqGH9aqpdaWcaaqaaiaabsgacaWGobaabaGaaeizaiaadshaaaaaaa@3AC4@

NOTE – The SI unit of activity is the reciprocal second (s−1) and is given the special name becquerel (Bq). The earlier special unit of activity, still in temporary use, was the curie (Ci). 1 Bq = 1 s−1 = 2,703 × 10−11 Ci approximately.




Publication date:1983-01
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