海洋环境监测用LaBr3：Ce原位Gamma-Ray光谱仪样机
A Prototype of LaBr3:Ce in situ Gamma-Ray Spectrometer for Marine Environmental Monitoring
摘要：
研制了一台用于海洋环境监测的LaBr 3：Ce现场γ谱仪样机，并进行了现场测量。探测器采用3英寸LaBr_3：Ce闪烁体，脉冲高度分析器采用数字脉冲处理电子学。该谱仪的能量响应是线性的，662 keV的能量分辨率为2.6%（远优于NaI）。在装有~（137）Cs的水槽中对样机进行了测量，得到了~（137）Cs的探测效率为（0.288 ± 0.01）cps/（Bq/L），与蒙特卡罗模拟的结果0.283 cps/（Bq/L）接近。用此方法计算出137 Cs在1小时内的MDAC为0.78Bq/L，优于NaI（Tl）原位γ谱仪的~1.0Bq/L。
英文摘要：
A prototype of LaBr3:Ce in situ gamma-ray spectrometer for marine environmental monitoring is developed and applied for in situ measurement. A 3-inch LaBr3:Ce scintillator is used in the detector, and a digital pulse process electronics is chosen as the pulse height analyzer. For this prototype, the energy response of the spectrometer is linear and the energy resolution of 662keV is 2.6% (much better than NaI). With the measurement of the prototype in a water tank filled with 137Cs, the detect efficiency for 137Cs is (0.288 0.01)cps/(Bq/L), which is close to the result of Monte Carlo simulation, 0.283cps/(Bq/L). With this measurement, the MDAC for 137Cs in one hour has been calculated to 0.78Bq/L, better than that of NaI(Tl) in-situ gamma spectrometer, which is ~1.0Bq/L.
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