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Off-center Fun Facts: Thermonuclear Explosion Fallout Edition
From the Environmental Protection Agency:
How does cesium-137 get into the environment?
Cesium-137 in the environment came from a variety of sources. The largest single source was fallout from atmospheric nuclear weapons tests in the 1950s and 1960s, which dispersed and deposited cesium-137 world-wide. However much of the cesium-137 from testing has now decayed.
http://www.epa.gov/rpdweb00/radionuclides/cesium.html#environment
Fortunately, cesium-137 isn’t all by its lonesome. It’s joined by its nuclear compatriots iodine-129, americum-241, strontium-90, and others! Wee! LOL!