![]() Some have very short half-lives and decay away in a few minutes or a few days, like iodine-131, which has a half-life of 8 days. ![]() Some stay in the environment for a long time because they have long half-lives, like cesium-137, which has a half-life of 30.17 years. About Radioactive Fallout From Nuclear Weapons TestingĪbout Radioactive Fallout From Nuclear Weapons Testingįallout typically contains hundreds of different radionuclides. ![]()
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