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β-активный источник stresses
радиоакт.	beta emitter; beta-emitting nuclide; beta-emitting radionuclide; ß-emitter; ß-emitting nuclide; ß-emitting radionuclide; beta decay radionuclide (radioisotope); ß-decay radionuclide (radioisotope); beta-active nuclide; ß-active nuclide; beta-radioactive nuclide; ß-radioactive nuclide; beta-radiator; ß-radiator
γ-активный источник
радиоакт.	gamma emitter; γ emitter; γ-emitter; gamma-radioactive nucleus; γ-radioactive nucleus; gamma-active nucleus; γ-active nucleus; gamma-emitting nucleus; gamma-ray-emitting nucleus; γ-emitting nucleus; gamma radiator; γ-radiator; gamma-ray emitter; γ-ray emitter
α-активный источник
радиоакт.	alpha emitter; alpha-radioactive nucleus; alpha-active nucleus; alpha-emitting nucleus; α emitter; α-emitter; α-radioactive nucleus; α-active nucleus; α-emitting nucleus; alpha radiator; alpha-particle emitter; alpha-ray emitter
активный источник
automat.	active source (напр., излучения)
telecom.	functional source (помех)

активный источник: 57 phrases in 10 subjects

Astronomy	1
Automated equipment	1
Business	1
Electronics	4
General	1
Information technology	2
Lasers	1
Mining	1
Programming	5
Радиоактивное излучение	40