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What is the exposure to a beam of rays (in roentgens)?

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A beam of rays passes through 4.0e-3 kg of dry air and generates 1.6e12 ions, each with a charge of +e. What is the exposure (in roentgens)?

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Solution Summary

First try to browse the web site http://www.hbcumi.cau.edu/tqp/451/451%20Module%20I/451-10/451-10.html. Check that 1 R = 2.58 x 10-4 coul/kg.

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