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)?
You first try to browse the web ...
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.