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продолжительное облучение stresses
el.	long continued exposure; long exposure
med.	protracted irradiation; long-term irradiation; long-continued irradiation
nucl.phys., OHS	long term exposure; long-time irradiation
радиогр.	chronic irradiation; continuous irradiation; permanent irradiation; chronic exposure; continuous exposure; permanent exposure

продолжительное облучение: 4 phrases in 2 subjects

Electronics	3
Energy industry	1