Radionuclides are radioactive isotopes that can occur naturally or result from manmade sources. Natural radiation comes from cosmic rays, naturally-occurring radioactive elements in the earth’s crust, and radioactive decay products. Since these radionuclides are present in soil and rock, they can also be found in groundwater and surface water. Typical radionuclides found in drinking water sources are isotopes of radium, uranium, and radon, among others. Fission products from manmade nuclear reactions are also of concern today, particularly radioactive cesium and iodine.

Water Research Foundation's Radionuclides info

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1. Aldehyde
2. Asbestos
3. Bromide/Bromate
4. Chlorate/Chlorite
5. Coal Ash
6. Disinfection Byproducts (DBP)
7. Endocrine Disrupting Compounds/ Pharmaceuticals and Personal Care Products
8. Fluoride
9. Giardia/ Cryptosporidium
10. Inorganic Contaminants (IOCs), Volatile Organic Contaminants, Synthetic Organic Contaminants
11. Lead and Copper
12. Long Term 2 Enhanced Surface Water Treatment Rule Documents
13. Nitrate
14. Perchlorate
15. Radionuclides
16. Total Organic Carbon/Alkalinity