Monte Carlo simulation of in situ LaBr gamma-ray spectrometer for marine environmental monitoring.
Monte Carlo simulation of in situ LaBr gamma-ray spectrometer for marine environmental monitoring.
复制标题
用于海洋环境监测的原位 LaBr 伽马射线能谱仪的蒙特卡罗模拟。
DOI：
10.1093/rpd/ncr122
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发表时间：
2011
影响因子：
1
通讯作者：
Jianping Cheng
中科院分区：
文献类型：
--
作者：
Genghua Su;Z. Zeng;Jianping Cheng
利用MCNPX代码和MATLAB程序，对浸入均质海水中的原位LaBr伽马射线能谱仪进行了海水中天然/人造放射性核素伽马射线能量响应函数的蒙特卡罗模拟以及LaBr晶体自活动能谱的模拟。以人工放射性核素(137)Cs的有效探测距离、探测效率和最低可探测活度浓度(MDAC)为例进行了计算。 NaI探测器也进行了类似的研究以进行比较。结果表明，LaBr 中的自活性使 MDAC 的劣化程度仅是 NaI 探测器的几倍。 LaBr 探测器可用作原位伽马射线光谱仪，用于监测海水中的人造放射性核素。
Monte Carlo simulation of energy-response functions of gamma rays from natural/artificial radionuclides in seawater and simulation of energy spectrum due to self-activity in LaBr crystal were carried out using MCNPX codes and MATLAB programs for the in situ LaBr gamma-ray spectrometer immersed in homogeneous seawater. The effective detection distance, the detection efficiency and the minimum detectable activity concentration (MDAC) for artificial radionuclides (137)Cs were worked out as an instance. Similar researches for NaI detector was also implemented for comparison. The results indicate that the self-activity in LaBr deteriorates the MDAC to merely several times of that of NaI detector. The LaBr detector is possible to be used as in situ gamma-ray spectrometer for monitoring of artificial radionuclides in seawater.