In human blood introduced a small amount of solution

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In human blood introduced a small amount of solution containing the isotope 24Na activity with 2 * 103 Bq. Activity 1 cm3 of blood after 5 hours was found to be 0.267 Bq. Find the volume of human blood. What amount of 24Na has been introduced into the blood and how long its concentration in the blood drop 100 times?

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Task 60394. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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