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The isotopes "Co^57 decays by electron...

The isotopes ` "_Co^57 ` decays by electrons capture to `"^57Fe` with a half - life 272d. The ` "^57Fe` nucleus is produced in an excited state, and it almost instantaneously emits gamma rays. If the activity of a radiation source ` "^57Co`is 2.0 `muCi` now, how many ` "_Co^57` nuclei does the sorce contains?

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