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Nuclear Fission

The cesium is...

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The cesium isotope $137^{C s}$ is present in the fallout from aboveground detonations of nuclear bombs. Because it decays with a slow (30.2 y) half-life into $ 137^{Ba} . releasing considerable energy in the process, it is of environmental concern. The atomic masses of the Cs and Ba are 136.9071 and 136.9058 u, respectively; calculate the total energy released in such a decay.

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