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The problem in the case of tritium is not external exposure, but harm caused exclusively by internal exposure. Tritium does not only exist as water. It is also incorporated into various biological substances from water, namely proteins, fats, and nucleic acids such as DNA (OBT = Organically Bound Tritium). And then, like a time bomb, it suddenly undergoes nuclear decay and is converted into helium-3. The β rays produced in this process are weak radiation, but they are powerful enough to destroy DNA. Furthermore, once helium is formed, the hydrogen bonds that bind nucleic acids are annihilated and the DNA is severely damaged beyond repair.
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