Elements used in radioactive dating


18-Oct-2017 10:50

NORM levels are typically expressed in one of two ways: Becquerels per kilogram (or gram) indicates level of radioactivity generally or due to a particular isotope, while parts per million (ppm) indicates the concentration of a specific radioisotope in the material.Terrestrial NORM consists of radioactive material that comes out of the Earth’s crust and mantle, and where human activity results in increased radiological exposure.The most important for the purposes of radiation protection are the radionuclides in the U-238 and Th-232 decay series.

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Material giving rise to these enhanced exposures has become known as naturally occurring radioactive material (NORM).

The long half-life of K-40 (1.25 billion years) means that it still exists in measurable quantities today.



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