Exposure and Risk

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Radiation related health effects (e.g., cancer) have been observed in humans only at doses in excess of  20,000 mrem in a single exposure to the whole body. Risk estimates used to predict health effects in exposed individuals come from epidemiological studies of populations exposed to high doses in short periods of time (e.g., medical patients and atomic bomb survivors). Epidemiological studies have not shown adverse health effects for individuals exposed to doses less than 20,000 mrem delivered over a period of several years. However, the possibility of adverse health effects from doses less than 20,000 mrem can't be entirely ruled out.


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