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    The radioactive decay of Cesium-137 sample

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    1. Following a terrorist release of Cesium-137 (half-life of 30 years) in downtown, clean up efforts were successful in removing all but 100 curies. How long will it take for the contamination to decay to about 5 curies?

    A. 90 years
    B. 130 years
    C. 175 Years
    D. 215 years

    please explain

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    Solution Preview

    Hello and thank you for posting your question to brainmass.

    Every 30 years the amount of CS-137 drops by a factor of two.

    If we start with N0 nuclei, then after 30 years we will have N0/2 ...

    Solution Summary

    The solution shows how to obtain the time needed for the radiation to fall to a certain level.