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A freshly isolated sample of 90Y was found to have an activity of 1.9 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 5.0 x 103 disintegrations per minute. Calculate the half-life of 90Y. Enter your answer in scientific notation.
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