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本文报道以φ100×100mm的低钾NaI(T1)晶体和GDB-76F型光电倍增管组合探头为探测器的室内外通用γ谱仪。在铅屏蔽室内,γ光子能量从0.05—2MeV范围本底计数率为1053计数/min。对~(137)Cs面源(φ5mm)的γ射线能量分辨率<10％,全能峰效率为16.3％,测量1000min,置信水平为95％,最小可探测下限为0.06Bq。环境就地测量20min可分析出10m半径范围内土壤中U系,Th系、~(40)K和~(137)Cs等核素的比放活度,并可给出距地面1m高处它们各自的γ吸收剂量率及总吸收剂量率值。
In this paper, a universal gamma spectrometer with a φ100 × 100mm low-potassium NaI (T1) crystal and a GDB-76F photomultiplier combined probe as the detector is reported. In the lead shielded room, the gamma photon energy counts from a background count of 0.05-2 MeV to a count of 1053 counts / min. The γ-ray energy resolution of ~ (137) Cs surface source (φ5mm) is less than 10%, the peak energy of all-around peak is 16.3%, the confidence level is 95% and the minimum detectable limit is 0.06Bq after measuring 1000min. Environmental in situ measurements 20min can be analyzed within the radius of 10m U, Th system, ~ (40) K and ~ (137) Cs and other nuclides than the specific activity, and can be given from the ground at a height of 1m Respective gamma absorption dose rate and total absorption dose rate value.