Modes of Exposure
There are two basic types of radiation exposure. Acute exposure is an exposure to a large amount of radiation in a short period of time. Chronic exposure is a long-term exposure to low levels of radiation such as that received from background radiation during the course of one's lifetime. Acute and chronic exposures can result from either external radiation sources or internally deposited radionuclides.
In general, the effects of acute exposures are much greater than those resulting from chronic exposures to the same amount of radiation.
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