Use of Iodine-131 To Measure Movements of Small Animals

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Science  12 Oct 1962:
Vol. 138, Issue 3537, pp. 147-148
DOI: 10.1126/science.138.3537.147


A technique utilizing iodine-131 was developed to study the movements of Microtus pennsylvanicus in the field. Iodine-131 (½ mc) was placed in a polyethylene capsule and inserted beneath the animal's skin. Movements of the animal were then followed for periods of up to 2 weeks by means of a Geiger-Müller counter attached to an aluminum pole.