Accession Number : AD0775031

Title :   The Efficiency Extrapolation Method in Coincidence Counting,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PHYSICS

Personal Author(s) : Baerg,A. P.

Report Date : 1973

Pagination or Media Count : 8

Abstract : A variety of nuclear species can now be measured by 4 pi (beta)(gamma)-coincidence methods making use of extrapolation procedures, but without requiring detailed knowledge of decay scheme parameters. By varying the beta-detector efficiency an experimental function is obtained giving the beta-channel counting rate in terms of the coincidence-to-gamma-channel counting ratio, (N sub c)/(N sub gamma). This function is taken to give the source disintegration rate when (N sub c)/(N sub gamma) has unit value. The techniques used in practice are reviewed and the theory examined in some detail to show how valid measures can be achieved experimentally. Since least squares data fitting plays an important role in the extrapolation procedure, methods are outlined which currently appear to be essentially free of major ambiguities. (Author)

Descriptors :   *Coincidence counting, Extrapolation, Gamma rays, Beta decay, Canada

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE