Naturally Occurring Radionuclides 1
Naturally Occurring Radionuclides 1 : Radionuclides that are naturally present in the environment and are two general types: primordial and cosmogenic. Most primordial radionuclides are isotopes of the heavy elements of the three radioactive series headed by uranium-238, thorium-232, and uranium-235. Cosmogenic radionuclides are produced by interactions in the atmosphere or in the earth; three of these [tritium (hydrogen-3), carbon-14, and sodium-22] are isotopes of major elements in the body.
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