If a vial were labeled "29 mCi at 1pm June 3," the activity in the vial at 1am June 6 is: 29 mCi e‐.693 (2.5/8.0) =23 mCi Alternatively, if n is the number of elapsed half‐lives, then: At = A0 (1/2)n 29

The half‐life is characteristic of the radioisotope, and cannot be inferred. The half‐life is included with the description of the decay scheme.

Decay constant (λ) The number of decay events in a sample per unit time, or activity A, is proportional to the number of radioactive parent atoms N in the sample; A = ‐λ N.

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