Recall that half-life is the time needed for the amount of a reactant to decrease by 50% or one-half.
The half-life of a first-order reaction is given by:
t1/2 = half-life
k = decay constant
Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k = 1.6 10–3 yr–1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of k = 0.011 day–1.
What is the half-life of iodine-125?
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