A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the exposure value received by the worker while standing for 2 hr near the source. The isotop half-life is 271.8 days.

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3. A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the exposure value
received by the worker while standing for 2 hr near the source. The isotop half-life is 271.8 days.

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