A freshly isolated sample of 90Y was found to have an
Chapter 20, Problem 28QP(choose chapter or problem)
A freshly isolated sample of \({ }^{90} \mathrm{Y}\) was found to have an activity of \(9.8 \times 10^{5}\) disintegrations per minute at 1:00 p.m. on December 3, 2010. At 2:15 p.m. on December 17, 2010, its activity was measured again and found to be \(2.6 \times 10^{4}\) disintegrations per minute. Calculate the half-life of \({ }^{90} \mathrm{Y}\).
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