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本文介绍用 NaI(Tl)γ谱仪测量环境γ照射量率的总谱能量法。谱仪用标准镭源刻度,刻度系数 K_r 为17.82(GeV/20min)/(μR/h),环境γ照射量率测量值的总不确定度约为±9.5%,在玉泉路高能所内外20多个测量点上的测量结果表明,γ谱仪与高气压电离室的测量值较好符合。文中还讨论了用总谱能量法测量环境γ照射量率时的几个有关问题。
In this paper, the total energy method for measuring the environmental γ-irradiation rate using NaI (Tl) γ spectrometer is introduced. The standard laser source scale with K_r of 17.82 (GeV / 20min) / (μR / h), the total uncertainty of measurement of ambient γ dose rate is about ± 9.5% The measurement results at several measurement points show that the γ spectrometer and the high pressure ionization chamber better fit the measured values. The paper also discusses several issues related to the measurement of ambient gamma exposure using the total energy spectrum method.