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仪器的探头由表面涂ZnS(Ag)的柱形塑料闪烁体(ST401型,φ75×75mm),高增益低噪声光电倍增管(GDB52LD)和铝蔽光套组成。测量电路为直流放大器。为减小光电倍增管暗电流和放大器栅流产生的仪器自身本底,设计了随温度变化的自动补偿电路。仪器的主要技术指标满足IEC标准(草案,SC 45B,C.O.52)的要求。有效测量范围:0.3×10~(-8)Gy·h~(-1)～300×10~(-8)Gy·h~(-1);相对固有误差不大于±3%;能量响应:50keV～1.25MeV,小于 ±10%;对宇宙射线空气吸收剂量率的测值(水面上)与高气压电离室测值在±5％内相符合;整机重量4kg;备有~(241)Am检查源。仪器可测量环境贯穿辐射天然本底剂量率。
The instrument’s probe consists of a surface-coated ZnS (Ag) cylindrical plastic scintillator (ST401, φ75 × 75mm), a high-gain, low-noise photomultiplier tube (GDB52LD) Measurement circuit for the DC amplifier. To reduce the photomultiplier tube dark current and amplifier gate current background of the instrument itself, designed with automatic temperature compensation circuit. The main technical specifications of the instrument meet the requirements of the IEC standard (draft, SC 45B, C.O.52). Effective measurement range: 0.3 × 10 ~ (-8) Gy · h -1 ~ 300 × 10 -8 Gy · h -1; relative intrinsic error less than ± 3%; Energy response: 50keV ~ 1.25MeV, less than ± 10%; The measurement value of the dose rate of cosmic ray absorbed air (above the water surface) is within ± 5% of the measurement value of the high pressure ionization chamber; the weight of the whole machine is 4kg; Am inspection source. The instrument measures the natural dose rate of the environment throughout the radiative background.