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You ingest 822 micrograms of I-131 as part of a radiotherapy program. The half-life of I-131...

You ingest 822 micrograms of I-131 as part of a radiotherapy program. The half-life of I-131 is 8.0207 days and it has a mass of 130.906 u. What is the activity of the sample after 1 hour? Give your answer in 10^12 decays/s.

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Answer #1

Mass of I-131 sample is

Mass of single I-131 nucleus is M=130.906u

Number of moles of I-131 is

Total number of I-131 nuclei

where NA is Avogadro's number.

Half life of I-131 is

The decay constant of I-131 is

The initial activity of the sample is

The activity at time t=1h=3600s is

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