An avergae 70-kg adult human contains 170g of potassium, Ask an Expert

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An avergae 70-kg adult human contains 170g of potassium. 0.0118% of naturally occuring potassium is potassium-40, which is a beta emitter with a half life of 1.28x109 years. What is the total activity (in counts per minute) of a human being, due solely to potassium-40?

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