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An Improved High-Level Whole-Body Counter

Oak Ridge Associated Universities, Oak Ridge, Tennessee

Correspondence: ¹ For reprints contact H. D. Hodges, ORAU Medical Division, P.O. Box 117, Oak Ridge. Tenn. 37830.

ABSTRACT

This whole-body counter is relatively inexpensive to build and provides quantitative whole-body retention values from 0.01 to 100 mCi. Two NaI(Tl) detectors suspended from the ceiling are positioned so that a point source anywhere on the bed gives a uniform counting response (±5%). Subjects are counted on a floor-level pad 1.9 meters under the detectors. The pad is hinged and can be fastened flat against the wall of the counting room when not in service. Optimum-window counting techniques provide a highly quantitative response regardless of the distribution of activity within the subject. A 1-min count of a person with more than 0.1 mCi results in an expected standard deviation of less than ±5%; 10 min are required for similar statistical results in the 0.01–0.1 mCi range.