137cs decays by beta minus emission to an isomeric state in, Ask an Expert

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¹³⁷Cs decays by beta minus emission to an isomeric state in ¹³⁷Ba which then decays by the emission of a gamma-ray. If we start with a 4 mCi of pure ¹³⁷Cs, define what will be the activity of ^137mBa after five minutes? The half-lives of 137Cs as well as 137mBa can be found in a chart of the nuclides.

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