IEVref: | 881-04-42 | ID: | |

Language: | en | Status: Standard | |

Term: | activity | ||

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Symbol: | A
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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:$A=\frac{\text{d}N}{\text{d}t}$ NOTE – The SI unit of activity is the reciprocal second (s
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Publication date: | 1983-01 | ||

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$A=\frac{\text{d}N}{\text{d}t}$
^{−1} = 2,703 × 10^{−11} Ci approximately.