Abstract
The radiation to which the human population is exposed comes from very diverse sources. Some of this sources are natural features of the environment. Significant natural radionuclides in soil, air, water, plant and living organism include isotopes of the 238U and 232Th decay chains and 40K. The concentration of radionuclides in soil which is directly relevant to the outdoor exposure, is largely determined by the activity concentration in the source rock.
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