New source–moderator geometry to improve performance of 252Cf and 241Am–Be source-based PGNAA setups

✍ Scribed by A.A. Naqvi; M.S. Abdelmonem; Ghada Al-Misned; Hanan Al-Ghamdi

• Book ID: 103855483
• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 272 KB
• Volume: 562
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2006.02.004

✦ Synopsis

The gamma ray yield from a 252 Cf and a 241 Am-Be source-based Prompt Gamma Ray Activation Analysis (PGNAA) setup has been observed to increase with enclosing their neutrons sources in a high-density polyethylene moderator. The prompt gamma rays yield from both setups depends upon the moderator length and the source position in it. For both setups, the optimum moderator length is found to be 7 cm. The optimum position of the neutron source inside moderator of the 252 Cf and the 241 Am-Be source-based PGNAA setups was found to be at a distance of 0.5 and 0.75 cm from the moderator-end facing the sample, respectively. Due to enclosure of the source in the moderator, about three-fold increase has been observed in the yield of prompt gamma rays from a Portland cement sample of a 252 Cf and a 241 Am-Be source-based PGNAA setups.