基于就地HPGe探测器的放射性热区边界探测技术研究

本文主要针对放射性热区探测技术展开研究，使用铅准直器加就地HPGe探测器这种测量模式在理论和实验方面确定了放射性热区埋深、热区上层边界、热区的厚度等关键参数。该测量系统具体操作过程是先进行扫描测量，确定热区的上层边界位置，然后在上层边界内定点测量确定该点的衰减层厚度，即埋深，去除衰减层再进行准直测量和倾斜测量即可确定每个测量点热区厚度。该技术方法在理论和实验方面均取得了良好结果，且两者符合很好。

Study on Detection Technology of Boundary for Radioactive Hot Area Based on In-situ HPGe Detector

The detection technology of radioactive hot area was studied by using in-situ HPGe detector with lead collimation. The key parameters of upper boundary, the thickness and the cover depth for radioactive hot area were determined by experiment and theory of this measurement model. In the process, the upper boundary of the radioactive hot area was confirmed by scanning measurement at first. Then the attenuation layer thickness of fixed point in the upper boundary of the radioactive hot area was confirmed. The thickness of the hot area was identified by alignment measurement and inclined measurement after the attenuation layer was determined. The technical method has obtained good results both in theory and experiment, and they are in good agreement.