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radioactive tracer
radioactive waste
radioactivity
radiobiology
radiobroadcasting
radiocarbon
radiocarbon dating
radiochemistry
radioelement
radiogenic
radiogram
radiograph
radioimmunoassay
radioiodine
radioisotope
radiolabel
radiolarian
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radioelement
ra·di·o·el·e·ment [ ràydee ō élləmənt ] (plural ra·di·o·el·e·ments)


noun 
Definition:
 
radioactive element: a chemical element that is radioactive
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