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radioactive tracer
chem.	traçador radioativo; traçador
environ.	marcador radioativo; traçadores radioativos
radiol.	traçador radioactivo
radioactive tracer A radioactive isotope which, when injected into a biological or physical system, can be traced by radiation detection devices, permitting determination of the distribution or location of the substance to which it is attached
environ.	traçadores radioactivos

radioactive tracer: 4 phrases in 3 subjects

Chemistry	1
Environment	2
Medical	1