Jafari M, Jafari H, Dastjerdi M H Choopan, Mokhtari J
Department of Radiation Application, Shahid Beheshti University, Tehran, Iran.
Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute, AEOI, Iran.
Heliyon. 2024 Oct 12;10(20):e39318. doi: 10.1016/j.heliyon.2024.e39318. eCollection 2024 Oct 30.
A radiation shield consists of borated polyethylene (7 % wt of boron) and lead was used for the HPGe detector in Isfahan MNSR's PGNAA facility in order to remove scattered neutrons and gamma rays, respectively. Therefore, the boron peak in gamma spectroscopy is related to both resources in the sample and in the shield, and it has caused a challenge in determination of boron concentration in the samples. In this research, various methods have been investigated to remove the effect of boron in the shield of the detector. For this purpose, Monte Carlo simulations of radiation transportation have been used. The results showed that by covering the detector shield using a cadmium sheet can greatly (99.32 %) reduce the height of the boron peak in prompt gamma spectrum recorded in the detector that come from the shield. The experiments have been done to validate the results obtained from the simulations.
一个由含硼聚乙烯（硼含量为7%重量）和铅组成的辐射屏蔽装置被用于伊斯法罕微型中子源反应堆的PGNAA设施中的高纯锗探测器，目的分别是去除散射中子和伽马射线。因此，伽马能谱中的硼峰与样品和屏蔽装置中的硼源都有关，这给测定样品中的硼浓度带来了挑战。在本研究中，已对各种去除探测器屏蔽装置中硼影响的方法进行了研究。为此，使用了辐射输运的蒙特卡罗模拟。结果表明，用镉片覆盖探测器屏蔽装置可大幅（99.32%）降低探测器记录的瞬发伽马能谱中来自屏蔽装置的硼峰高度。已开展实验以验证模拟得到的结果。
