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研制成功一台以φ100×100mm的低钾NaI(T1)晶体和GDB-76F型光电倍加管组合探头为探测器的室内外通用γ谱仪。在铅屏蔽室内,对于γ光子能量在0.05—2MeV范围的本底计数率为1053计数/分。对~(137)Cs源的γ射线能量分辨率<10%,全能峰效率为16.3%,测量1000分钟,置信水平为95%,最小可探测限为3.8计数/分。谱仪系统对~(238)U,~(232)Th,~(226)Ra,~(40)K,~(137)Cs和~(60)Co等核素的探测灵敏度可达到0.4Bq·kg~(-1)左
A universal γ spectrometer with φ100 × 100mm low potassium NaI (T1) crystal and GDB-76F photomultiplier combined probe as detector was successfully developed. In the lead shielded room, the background count rate for gamma photon energy in the range of 0.05-2 MeV is 1053 counts / minute. The γ-ray energy resolution of ~ (137) Cs source is <10%, the all-peak peak efficiency is 16.3%, the measurement is 1000 minutes, the confidence level is 95% and the minimum detectable limit is 3.8 counts / min. The sensitivity of the spectrometer system to the detection of ~ (238) U, ~ (232) Th, ~ (226) Ra, ~ (40) K, ~ (137) Cs and ~ (60) Co can reach 0.4Bq · kg ~ (-1) left