Be sure to answer all parts. A freshly isolated sample of 90y was found to have an activity of 9.7 x 105 disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on December 17, 2006, its activity was measured again and found to be 2.6 x 104 disintegrations per minute. Calculate the half-life of 90Y. Enter your answer in scientific notation. x 10 | minutes

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