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

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.

Measures of activity (A) The number of disintegrations, or decay events, or nuclear transformations, in a sample per unit time is its activity A.

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