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采用蒙特卡罗(MC)方法和技术,建立了用于环境测量的就地HPGeγ谱仪对点源的全能峰探测效率因子(N_0/φ)和角响应校正因子(N_f/N_0)的MC计算数学模式,进而利用Beck公式,给出了理论计算就地HPGeγ谱仪测量土壤中天然和人工放射性核素的比活度校准系数(N_f/A)及其地面上1m高处的空气吸收剂量率校准系数(N_f/D)的方法。采用自编的MC专用计算软件,计算了两台就地HPGeγ谱仪的(N_0/φ),(N_f/N_0),(N_f/A)的理论值并与它们的实验值进行了比较。在能量129kev～2.62MeV范围内,上述两台就地HPGeγ谱仪,(N_f/A)的计算值与实验值一般在±6％的相对偏差范围内吻合,最大相对偏差小于±9％。
The Monte Carlo (MC) method and technique were used to establish MC measurements of the point-source all-around peak detection efficiency factor (N_0 / φ) and the angular response correction factor (N_f / N_0) using an in-situ HPGe γ spectrometer for environmental measurements Mathematical model, and then use the Beck formula to calculate the calibration coefficient (N_f / A) of specific activity of natural and artificial radionuclides in soil measured by in-situ HPGeγ spectrometer and the air absorption dose rate at 1m above the ground Method of calibration factor (N_f / D). The theoretical values of (N_0 / φ), (N_f / N_0) and (N_f / A) of two in-situ HPGe γ spectrometers were calculated and compared with their experimental values using a dedicated MC calculation software. In the range of 129 keV ~ 2.62 MeV, the calculated values of (N_f / A) of the two in-situ HPGe gamma spectrometers agree well with the experimental values within the relative deviation of ± 6% with the maximum relative deviation less than ± 9%.