论文部分内容阅读
在天然辐射环境下,无法找到仅含单一天然放射性系列的近似无限大地层用于获取航空γ谱仪的响应谱,这是导致无法利用最小二乘法解析航空γ能谱的关键问题所在。本文基于介质互换原理、地层模块化与分能区多次模拟的思想,通过构建Monte Carlo组合模型,从而获得了含不同放射性物质的任意形状地层上空航空γ谱仪的响应谱。依据航空γ能谱测点上γ辐射来源与石家庄动态带分析,建立了一套可靠的最小二乘法航空γ能谱解析模型。通过对野外10 km测线分析发现,当地层含量大于4×10~(-6)时,该方法与标准方法分析结果相当。同时该方法为人工放射性核素响应谱的剥离提供参考。
In natural radiation environments, an infinitely infinite layer containing only a single natural radioactive series can not be found to obtain the response spectrum of an aero-gamma spectrometer, which is a key issue that renders it impossible to resolve aeronautical gamma spectra using the least square method. Based on the idea of medium exchange, stratigraphic modularization and multiple simulations of sub-energy zones, a Monte Carlo combined model is constructed to obtain the response spectra of aero-gamma spectrometer with arbitrary radioactive material. Based on the sources of gamma radiation at the gamma ray energy spectrum measuring point and the dynamic band analysis of Shijiazhuang, a reliable analytical model of aeronautic γ-ray spectrum of least squares is established. According to the 10 km line survey in the field, it is found that the method is equivalent to the standard method when the formation content is more than 4 × 10 ~ (-6). At the same time, this method provides a reference for the separation of artificial radionuclide response spectrum.