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All minerals and raw materials contain radionuclides of natural origin.
However, certain work activities can give rise to significantly enhanced exposures that may need to be controlled by regulation.Material giving rise to these enhanced exposures has become known as naturally occurring radioactive material (NORM).NORM is the acronym for Naturally Occurring Radioactive Material, which potentially includes all radioactive elements found in the environment. Constraining the cause of the end-Guadalupian extinction with coupled records of carbon and calcium isotopes. Contributions to Mineraology & Petrology, 15 Mulcahy, S.