"Radionuclides are known to be associated with organic materials in nature; therefore, oil, gas, and oil field brines frequently contain radioactive materials. These materials accumulate in piping used to remove and process petroleum and natural gas. The EPA estimates that about 8 million metric tons of NORM waste will be produced by the gas and oil industry over the next 20 years.
NORM have been found in geothermal wells. According to EPA estimates, the geothermal industry may generate up to 1.4 million metric tons over the next 20 years. ..... The EPA estimates that over 6 million metric tons of drinking water purification materials containing NORM will be generated over the next 20 years."
http://www.hps1.org/glossary/norm.htm
NORM (Naturally Occurring Radioactive materials - generally concentrated in mechanical processes) could include: isotopes of uranium, thorium, carbon, potassium, polonium, lead, radon
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