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Terms for subject Радиоактивное излучение containing radioactive element | all forms | in specified order only
| English | Russian |
| naturally occurring radioactive element | естественный радиоактивный элемент |
| naturally occurring radioactive element | природный радиоактивный элемент |
| primordial radioactive element | исходный радиоактивный элемент (natural, of half-life sufficiently long to exist since the formation of earth's crust) |