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90- Q3: ''Sr decays to 90Y by decay with a half-life of 28 years. 9y decays by B decay to 9Zr with a half-life of

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90- Q3: ''Sr decays to 90Y by decay with a half-life of 28 years. 9y decays by B decay to 9Zr with a half-life of 64 h. A pure sample of 9Sr is allowed to decay. What is the composition after (a) 1 h (b) after 10 years ? (12M)

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