The specific activity of a preparation consisting of radioactive Co58 as and non-radioactive Co59 ao is equal

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The specific activity of a preparation consisting of radioactive Co58 as and non-radioactive Co59 ao is equal to 2.2.1012 dis /(s ∙ g). The half-life of Co58 as is 71.3 days. Find the ratio of the mass of radio active cobalt in that preparation to the total mass of the preparation (in per cent).
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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