Part of Body Exposed

Diagnostic and therapeutic radiation involves almost exclusively partial-body exposure, in contradistinction to that received by A-bomb 

That radiation exposure of one part of the body can affect the carcinogenic risk of a distant part (abscopal effect) has not been shown in man, but the possibility of such an effect is suggested by the observation that sterilization of young women may protect against breast cancer, that is, pelvic irradiation sufficient to greatly diminish estrogen levels might have a similar effect. 

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II) The harm caused depends upon the activity of the source (i.e the half-life and mass of the radionuclide), the type of nuclear radiation, the distance of the individual from the source, the health and age of the individual, the area or part of body exposed, the duration of exposure, the degree of protection provided etc. 

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