True coincidence-summing corrections for the coincident gamma-rays measured with coplanar grid CdZnTe detectors

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

APPLIED RADIATION AND ISOTOPES, vol.68, no.6, pp.1040-1048, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 68 Issue: 6
  • Publication Date: 2010
  • Doi Number: 10.1016/j.apradiso.2010.01.042
  • Journal Name: APPLIED RADIATION AND ISOTOPES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1040-1048
  • Keywords: Coplanar grid (CPG), CdZnTe (CZT) detector, True coincidence summing (TCS), Gamma-ray, Disc source, DETECTION EFFICIENCY, X-RAY, CDTE
  • Ankara University Affiliated: Yes

Abstract

In this study, true coincidence-summing (TCS) correction factors have been measured for the sources (22)Na, (60)Co, (133)Ba and (152)Eu by use of three large volume coplanar grid CdZnTe (acronym: CZT) detectors. In case of a close-in detection geometry, two different TCS calculation algorithms were used to compute the required TCS correction factors. Both of the algorithms are based on the measured total-to-peak (TTP) ratio and full-energy peak (FEP) efficiency values that were obtained using almost "single" energy and coincidence-free nuclides. The results for TCS correction factors obtained by two different algorithms were agreeable to each other. The obtained TCS factors were ranged from about 7% to 30.5% in a 2250 mm(3) CZT detector when a close counting geometry was used. For other two detectors with a volume of 1000 and 1687.5 mm(3), the resulted TCS correction factors were relatively smaller and varied between about 0.1% and 20% at the close counting geometry condition. Therefore, the results indicate that there is a need for the estimation of TCS corrections in CZT detectors, especially when their crystal volumes are greater than 1 cm(3) and these detectors are used in the case of a close-in detection geometry. (C) 2010 Elsevier Ltd. All rights reserved.