A semi-empirical method for calculation of true coincidence corrections for the case of a close-in detection in gamma-ray spectrometry


Yucel H., Solmaz A. N. , Kose E. , Bor D.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol.283, no.2, pp.305-312, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 283 Issue: 2
  • Publication Date: 2010
  • Doi Number: 10.1007/s10967-009-0360-8
  • Title of Journal : JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Page Numbers: pp.305-312

Abstract

In this paper, a semi-empirical method is proposed to determine true coincidence-summing (TCS) correction factors for high resolution gamma-ray spectrometry. It needs the knowledge of both full energy peak (FEP) efficiency and total-to-peak (TTP) efficiency curves. The TTP efficiency curve is established from the measurements with a set of coincidence-free point sources. Whereas for a volume source, the coincidence-free FEP efficiency curve is obtained iteratively by using the peaks from almost the coincidence-free nuclides and those from the coincident nuclides in the mixed standard sources. Then the fitting parameters obtained for both TTP and FEP efficiency curves are combined in a freely-available TCS calculation program called TrueCoinc, which yields the TCS correction factors required for any nuclide. As an application, the TCS correction factors were determined for the particular peaks of U-238, Ra-226 and Th-232 in the reference materials, measured in the case of a close-in detection geometry using a well-type Ge detector. The present TCS correction method can be applied without difficulty to all Ge detectors for any coincident nuclide.