本文介绍了一台就地测量环境γ照射量率的 NaI(Tl)谱仪。并介绍了测量陆地总γ照射量率的谱能法和测量单个核素或天然衰变系γ照射量率的峰面积法及其有关刻度因子与参数的确定方法。在原子能所建筑物内外做了一些现场测量,有的测量结果和高压电离室或 PTB-7201型剂量仪的测量值作了比较,二者在±5%范围内是吻合的。 This paper presents a NaI (Tl) spectrometer that measures the gamma radiation in situ. The spectral energy method for measuring the total γ radiation on the land and the method for determining the peak area of ​​the γ radiation dose rate of a single nuclear or natural decay system as well as the related scale factors and parameters are introduced. Some measurements have been done inside and outside the building of IAEA. Some measurements are compared with the measured values ​​of high pressure ionization chambers or PTB-7201 dosimeters, and both agree within ± 5%.