介绍了一种便携式就地 Na I( Tl) γ谱仪 ,该系统可用于环境或核事故后就地 γ能谱的测量 ,给出了环境中放射性核素的组成及各自的质量活度 ( Bq/kg)或表面活度 ( Bq/cm2 )和地面 1m高度的周围吸收剂量率 ( Gy/h) A portable on-site NaI (Tl) gamma spectrometer is introduced, which can be used for the measurement of γ spectra in situ after environmental or nuclear accidents. The composition of radionuclides and their mass activities ( Bq / kg) or surface activity (Bq / cm2) and 1m above the ground (Gy / h)