tritium -
a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms
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Wiktionary
Substantiv
tritium -
An atom of this isotope.
Wikipedia
Tritium (symbol T or H, also known as hydrogen-3) is a radioactive isotope of hydrogen. The nucleus of tritium (sometimes called a triton) contains one proton and two neutrons, whereas the nucleus of protium (by far the most abundant hydrogen isotope) contains one proton and no neutrons. Naturally-occurring tritium is extremely rare on Earth, where trace amounts are formed by the interaction of the atmosphere with cosmic rays.
OmegaWiki Dictionary
Ω
tritium The hydrogen isotope having mass number 3; it is one form of heavy hydrogen, the other being deuterium.
