Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., geiger counter. Compounds containing tracers are often said to be tagged or labelled. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
Radioactive elements incorporated into insecticides or other chemicals to aid in tracing the metabolism of the compound in the living, moribund, or dead organisms.
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http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.
