disintegrations per unit time dN/dt for an atomic nucleus divided by the number of nuclei N existing at the same time t
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.
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