Thus, the gamma-ray output is directly proportional to both activity of the source and time, andhence is directly proportional to their product. Analogously to the x-ray exposure, the gamma-rayexposure E may be stated E = Mt, where M is the source activity in curies and t is the exposuretime, the amount of gamma radiation remaining constant so long as the product of source activityand time remains constant. This permits specifying gamma-ray exposures in curie-hours withoutstating specific values for source activity or time.
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