Monte Carlo based geometrical model for efficiency calculation of an n-type HPGe detector

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• 作者：Fatima Padilla Cabal ; Neivy Lopez-Pino ; Jose Luis Bernal-Castillo ; Yisel Martinez-Palenzuela ; Jimmy Aguilar-Mena ; Katia D’ ; Aless ; ro ; Yuniesky Arbelo ; Yasser Corrales ; Oscar Diaz
• 关键词：Gamma spectrometry ; Efficiency ; Monte Carlo ; MCNPX ; GEANT
• 刊名：Applied Radiation and Isotopes
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：68
• 期：12
• 页码：2403-2408
• 全文大小：723 K

文摘

A procedure to optimize the geometrical model of an n-type detector is described. Sixteen lines from seven point sources (²⁴¹Am, ¹³³Ba, ²²Na, ⁶⁰Co, ⁵⁷Co, ¹³⁷Cs and ¹⁵²Eu) placed at three different source-to-detector distances (10, 20 and 30 cm) were used to calibrate a low-background gamma spectrometer between 26 and 1408 keV. Direct Monte Carlo techniques using the MCNPX 2.6 and GEANT 4 9.2 codes, and a semi-empirical procedure were performed to obtain theoretical efficiency curves. Since discrepancies were found between experimental and calculated data using the manufacturer parameters of the detector, a detail study of the crystal dimensions and the geometrical configuration is carried out. The relative deviation with experimental data decreases from a mean value of 18–4 % , after the parameters were optimized.