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A source has a half-life of 12 hours and an initial

1. A source has a half-life of 12 hours and an initial activity of 10mCi. After 4 days what is its activity?

2. Calculate the % of activity remaining in a source after 10 half lives.

3. a. A radionuclide decays 1% in one day. Calculate the half life.

b. A radionuclide decays 70% in one day. Calculate the half life.

4. A sample of 10.0 mCi of radioisotope decays 1.2 % in a single day

a. What is the activity after one day?

b After 30 days?

5. A sample of Cs- 137 initially contains 1000 atoms. How many Cs- 137 atoms does the sample contain after 2 years?

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