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How would I calculate the initial activity of the bone-assimilated of Sr-90 if 2.79 pCi of Sr-90 per gram of Ca out of approximately 1

How would I calculate the initial activity of the bone-assimilated of Sr-90 if 2.79 pCi of Sr-90 per gram of Ca out of approximately 1 kg of total Ca contained in an average persons bones. What would the activity be in Bq and the number of nuclides present at the time of exposure and the mass of strontium in picograms. The half-life of Sr-90 is 29.12 years.

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