A freshly isolated sample of 90Y was found to have an activity of 9.8 105 disintegrations

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A freshly isolated sample of 90Y was found to have an activity of 9.8 × 105 disintegrations per minute at 1:00 p.m. on December 3, 2003. At 2:15 p.m. on December 17, 2003, its activity was redetermined and found to be 2.6 × 104 disintegrations per minute. Calculate the half-life of 90Y.
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Chemistry

ISBN: 978-0077274313

10th edition

Authors: Raymond Chang

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