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Symposium on Atomic Energy in Animal Science. I. The Illinois Animal Science Counter: Performance Characteristics and Animal Radioactivity Measurement Procedures^{1, 2, 3,}

University of Illinois, Urbana

Abstract

A large-volume liquid scintillation detector capable of measuring radioactivity in human beings and animals as large as cattle is described. The performance characteristics of the instrument are described, including short- and long-term electronic stability, energy resolution, detection efficiency calibration and the use of instrument standards. Methods are discussed for preparing animals for K⁴⁰ measurements so as to reduce interference by radiocontaminants, and for loading and positioning animals in the detector so as to minimize errors caused by positioning and subject movement.

¹ Presented at the 56th Annual Meeting of the American Society of Animal Science, Knoxville, Tennessee.

² Supported in part by U.S.A.E.C. Grant No. AT(11-1) 1339.

³ The assistance of W. G. Crackel and D. B. Hartman is gratefully acknowledged.

⁴ Department of Veterinary Physiology and Pharmacology.

⁵ Department of Animal Science.