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излучатель электронов强调
радиоакт. beta-minus emitter; beta-minus decay radionuclide (radioisotope); β-emitter; β~-decay radionuclide (radioisotope); beta-minus-active nuclide; beta-minus-radioactive nuclide; β~-active nuclide; ß~-radioactive nuclide; negatron emitter
冶金 electron emitter