Source: Produced in nuclear fission reactions, it may emerge as a contaminant from nuclear waste or may occur in the environment as a byproduct of nuclear weapons.

Summary: Strontium-90 is a radioactive isotope of strontium with 52 neutrons. This isotope is formed in nuclear fission reactions, or as a byproduct of nuclear weapons. It may be produced through nuclear reaction for the medical industry. Where nuclear bombs were tested, strontium-90 exists as an environmental contaminant. It may also be discharged from nuclear reactors to the environment. The isotope undergoes beta decay with a half-life of 28.8 years to produce yttrium-90. There is no removal process for strontium-90 from water and soil.