2. Caesium-137 decays via β - emission with a half-life of 30.17 years. A sample is initially measured to have an activity of 400 Bq. You may use 1 year = 31,556,952 s. a. Write the β - decay reaction. _________________________________ b. What is the initial number of Cs-137 atoms in the sample? ________________________ c. How long will it take for the sample to have an activity of 100 Bq? ________________________

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