Naqvi A A, Al-Matouq Faris A, Khiari F Z, Isab A A, Raashid M
Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Appl Radiat Isot. 2013 Aug;78:145-50. doi: 10.1016/j.apradiso.2013.04.006. Epub 2013 Apr 15.
Hydrogen, carbon and oxygen concentrations were measured in caffeine, urea, ammonium acetate and melamine bulk samples via 14 MeV neutron inelastic scattering using a LaBr3:Ce detector. The samples tested herein represent drugs, explosives and benign materials, respectively. Despite its intrinsic activity, the LaBr3:Ce detector performed well in detecting the hydrogen, carbon and oxygen elements. Because 5.1 MeV nitrogen gamma rays interfere with silicon and calcium prompt gamma rays from the room background, the nitrogen peak was not detected in the samples. An excellent agreement was observed between the experimental and theoretical yields of 2.22, 4.43 and 6.13 MeV gamma rays from the analyzed samples as a function of H, C and O concentrations, respectively. Within statistical errors, the minimum detectable concentration (MDC) of hydrogen, carbon and oxygen elements in the tested materials were consistent with previously reported MDC values for these elements measured in hydrocarbon samples.
通过使用溴化镧铈（LaBr3:Ce）探测器，利用14兆电子伏特中子非弹性散射，对咖啡因、尿素、醋酸铵和三聚氰胺块状样品中的氢、碳和氧浓度进行了测量。本文测试的样品分别代表药物、爆炸物和良性材料。尽管溴化镧铈探测器具有固有活性，但在检测氢、碳和氧元素方面表现良好。由于5.1兆电子伏特的氮伽马射线会干扰来自房间本底的硅和钙的瞬发伽马射线，因此在样品中未检测到氮峰。分别作为氢、碳和氧浓度的函数，观察到来自分析样品的2.22、4.43和6.13兆电子伏特伽马射线的实验产率与理论产率之间具有良好的一致性。在统计误差范围内，测试材料中氢、碳和氧元素的最小可检测浓度（MDC）与先前报道的在烃类样品中测量的这些元素的MDC值一致。
