基于闪烁体阵列的双端读出快中子探测器及其轴向位置校准方法

A Fast Neutron Detector With Dual-Ended Readout Based on Scintillator Array and Its Axial Position Calibration Method

轴向位置的精确测量是快中子探测领域的挑战和难题,对高分辨率的快中子成像具有重要意义。改进位置和时间响应能使快中子成像获得更好的成像分辨率和对比度,而提升时间分辨的困难主要来自相互作用深度(depth of interaction,DOI)的不确定性。针对位置改进的问题,设计了一种基于有机闪烁体阵列的双端读出快中子探测器,提出了一种用于校准DOI的方法。该校准方法基于快中子探测器双端读出的数据来进行系列计算和拟合,最终得到轴向位置校准曲线。研究结果表明,该校准方法解决了快中子探测中轴向定位不准确的问题,提高了快中子探测器的位置分辨率。

To solve the problem of inaccurate axial positioning in fast neutron detection,a dual-ended readout fast neutron detector based on the scintillator array is designed,and a method for calibrating the uncertainty of depth of interaction(DOI)is proposed.This calibration method is to calculate and fit the data read from both ends of the fast neutron detector,and finally get the axial position calibration curve.The simulation is carried out by using the GEANT4 toolkit,and the results calculated by the calibration method show that the detector improves the axial position resolution of fast neutron detection.