![]() The legacy of open-air nuclear weapons testing includes a small but significant increase in thyroid cancer, leukemia and certain solid tumors. Cancer investigators have been studying the health effects of radioactive fallout for decades, making radiation one of the best-understood agents of environmental injury. These tests injected radioactive material into the atmosphere, much of which became widely dispersed before being deposited as fallout. Between 19, the U.S., the U.S.S.R, the U.K., France and China carried out more than 500 atmospheric tests of nuclear weapons totaling the explosive equivalent of 440 megatons of TNT.
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