de-cay rate

decay constant

noun Physics.
the reciprocal of the decay time.
Also called decay rate, disintegration constant.


Origin:
1930–35

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Medical Dictionary

decay constant n.

Symbol λ The constant ratio for the number of atoms of a radionuclide that decay in a given period of time compared with the total number of atoms of the same kind present at the beginning of that period. Also called disintegration constant, radioactive constant.

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