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Natural potassium contains 40K , which has a half-life of 1.277×109 years. What mass of 40K...

Natural potassium contains 40K , which has a half-life of 1.277×109 years. What mass of 40K in a person would have a decay rate of 4140 Bq? (b) What is the fraction of 40K in natural potassium, given that the person has 140 g in his body? (These numbers are typical for a 70-kg adult.)

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