(Answered) Strontium-90 has a half-life of 288 years the first atomic

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Strontium-90 has a half-life of 28.8 years. The first atomic explosion at Trinity Site in New Mexico in 1945 generated significant amounts of strontium-90. It has been 73 years since this detonation. What fraction of the strontium-90 originally present still remains?

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