// definition
Half-life
Physical radioactive half-life
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Short definition
The time required for a radionuclide’s activity to fall by half through nuclear decay. Physical half-life differs from a medicine’s shelf life and does not, by itself, determine the longest permitted delivery time.
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Intuition
Decay continues during preparation and transport.
Formula
A(t) = A(0) × 2^(−t/T½), with t and T½ expressed in the same time unit