The first atomic explosion was detonated in the desert north of Alamogordo, New Mexico, on July 16,
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The first atomic explosion was detonated in the desert north of Alamogordo, New Mexico, on July 16, 1945. What fraction of the strontium- \(90\left(t_{1 / 2}=28.8 \mathrm{yr}ight)\) originally produced by that explosion still remains as of July 16,2008 ?
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