Eastern harvest mice, Reithrodontomys humulis humulis (Audubon and Bachman), were tagged with subcutaneously inserted 20 gauge gold-198 wires 10 mm long and varying in activity from 0.7 to 4.5 mc. None of the tags inserted by this method were lost or had any apparent effect on the animals. The movements of the tagged mice were successfully traced with a portable Geiger counter.
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S.V. Kaye (1960) studied this question.
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