Only laboratory studies on mice at extremely high levels, only achievable in the laboratory, have shown any adverse health effects. Tritium is just assumed to be carcinogenic to humans at extremely high levels, although that claim is only hypothetical since adverse health effects from tritium have never appeared in humans or in the environment. Let’s say that again – no harm has ever come to humans or the environment from tritium, no matter what the concentration or the dose. Tritium is formed naturally by atmospheric processes as well as in nuclear weapons testing and in nuclear power plants. Tritium is the mildly radioactive isotope of hydrogen that has two neutrons and one proton, with radioactivity so low that no environmental or human problems have ever come from it, even though it is a common radioactive element in the environment. Although not intuitive, this is a very good idea.
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