Radioactivity, Natural
Radioactivity, Natural :
Naturally occurring nuclides which are radioactive. A distinction is drawn between natural radionuclides which are continuously regenerated by nuclear reactions of cosmic radiation, cosmogenic radionuclides (→radionuclides, cosmogenic) and primordial (initial) radionuclides (→radionuclides, primordial), which have existed since the earth was formed and due to their long half-life have not yet decayed and the radionuclides generated from the primordial radionuclides U-238, U-235 and Th-232 of the associated →decay chain
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