Explore BrainMass
Share

Explore BrainMass

    The radioactive decay of Cesium-137 sample

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    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

    © BrainMass Inc. brainmass.com October 9, 2019, 10:23 pm ad1c9bdddf
    https://brainmass.com/chemistry/environmental-chemistry/radioactive-decay-cesium-sample-218890

    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.

    $2.19