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radioactive tracer
chem.	tracer; sporingsstof; sporstof
environ.	radioaktivt sporstof
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.	radioaktivt sporstof
radioactive tracers
environ.	radioaktive sporstoffer

radioactive tracer: 4 phrases in 3 subjects

Chemistry	1
Environment	2
Medical	1