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Q.49

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1237

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Short Answer

137 Cs is a common product of nuclear fission. Suppose an accident spills 550 mCi of 137 Cs in a lab room.

a. What mass of 137 Cs is spilled?

b. If the spill is not cleaned up, how long will it take until the radiation level drops to an acceptable level, for a room this size, of 25 mCi?

Number of atom is,

See the step by step solution

Step by Step Solution

Convert Ci to Bq

1Ci= 3.7x1010 Bq

so,

And final decay rate of 137Cs is calculated as follows,

Substitute 30 year for t1/2 from Appendix C in above final rate equation.

Here is the mass of uranium 6.32x10-6kg

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