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蒙特卡罗(Monte Carlo,MC)模拟方法被广泛应用于γ能谱分析参数的获取,但因探测高度较高带来的深穿透问题限制了其在航空γ能谱中的应用。研究发现,探测器距离地层边界大于可探测半径时,MC模拟得到地层上空相同高度所有航空γ能谱仪响应规律均相同。根据这一规律,本文提出一种球壳型地层、航空γ探测器的MC模拟模型,通过对4个航空γ能谱仪刻度模型的模拟发现,MC模拟谱与多次实测平均谱吻合较好。同时利用该模型模拟了芬兰Vesivehmaa地区4种典型核素于100 m高空的刻度系数,结果显示模拟值与取样实测值及Allyson自编软件模拟值在±20%内符合,证明该模型能很好地应用于航空γ能谱仪地层信息反演计算参数的快速获取。
The Monte Carlo (MC) simulation method is widely used in the acquisition of γ-ray spectrum analysis parameters. However, the deep penetration due to the high detection height limits its application in the airborne γ-ray spectrum. The study found that when the detector is more than the detectable radius from the boundary of the formation, all the aeronautical γ-ray spectrometers have the same response rules when the MC simulation results in the same height above the formation. According to this law, this paper presents a MC shell model and aero-γ detector MC simulation model. Through the simulation of four airborne gamma spectrometer scale models, it is found that the MC simulation spectrum is in good agreement with the real measured average spectrum . At the same time, the model was used to simulate the calibration coefficients of four typical radionuclides in the Vesivehmaa region of Finland at 100 m altitude. The results show that the simulated values agree well with the measured values and the simulated values of Allyson’s own software within ± 20% It is applied to the rapid acquisition of the parameters of inversion of formation information of aeronautical γ spectrometer.