Carbon 14 useful radioactive dating not nuclear medicine
The two most important chains providing nuclides of significance in NORM are the thorium series and the uranium series: Another major source of terrestrial NORM is potassium 40 (K-40).The long half-life of K-40 (1.25 billion years) means that it still exists in measurable quantities today.
NORM is the acronym for Naturally Occurring Radioactive Material, which potentially includes all radioactive elements found in the environment.
Over time, as potential NORM hazards have been identified, these industries have increasingly become subject to monitoring and regulation.
However, there is as yet little consistency in NORM regulations among industries and countries.
For most human activities involving minerals and raw materials, the levels of exposure to these radionuclides are not significantly greater than normal background levels and are not of concern for radiation protection.
However, certain work activities can give rise to significantly enhanced exposures that may need to be controlled by regulation.
The term NORM exists also to distinguish ‘natural radioactive material’ from anthropogenic sources of radioactive material, such as those produced by nuclear power and used in nuclear medicine, where incidentally the radioactive properties of a material maybe what make it useful.