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vesiniku teisend massiarvuga 2, mida kasutatakse nt meditsiinis ainevahetuse jälgimiseks, tuumareaktorites neutronite aeglustina
vesiniku stabiilne isotoop, isótopo del hidrógeno cuya masa o peso atómico es de aproximadamente 2, the isotope of hydrogen with proton number 1 but nucleon (mass) number 2