论文标题
GEANT4模拟研究对银河宇宙射线中微型辐射探测器的响应和航天器内部的响应
GEANT4 simulation study of the response of a miniature radiation detector in Galactic Cosmic Rays and inside a spacecraft
论文作者
论文摘要
用于在空间中应用的小型检测器（MIDAS）是一种紧凑的设备，具有5 x 5 x 1 cm3的尺寸，结合了位置敏感的SI检测器和快速中子光谱仪。 MIDA的开发是为了充当带电颗粒的线性能传递（LET）光谱仪，并测量与带电颗粒和中子的剂量和剂量相等的剂量和剂量。它基于用于带电的轨道和能量沉积测量值的完全消耗的单片活性Si像素传感器，而硅光电层状读取的塑料闪烁体用于确定快速中子的能量沉积。借助Geant4进行了银河宇宙射线（GCR）辐射场中检测器反应的仿真研究。能量沉积和HIT像素地址已用于重建轨道并计算LET Spectra。从测得的LET中计算出$ LET \ Infty $的方法已被详细阐述。已经计算出水和剂量等效率的剂量率。已经确定了GCR与航天器模型的Al壁相互作用产生的辐射场的能量和颗粒组成，并研究了MIDAS在此辐射场中的响应。
The Miniaturized Detector for Application in Space (MIDAS) is a compact device with dimensions 5 x 5 x 1 cm3 which combines position sensitive Si detectors and a fast neutrons spectrometer. MIDAS is developed with purpose to act as a linear energy transfer (LET) spectrometer for the charged particles and measure dose and dose equivalent from both charged particles and neutrons. It is based on fully depleted monolithic active Si pixel sensors for the charged track and energy deposition measurements, while a plastic scintillator read out by a silicon photomultiplier is used to determine energy depositions from fast neutrons. A simulation study of the detector response in galactic cosmic ray (GCR) radiation fields with the aid of GEANT4 has been performed. Energy depositions and hit pixel addresses have been used to reconstruct tracks and calculate LET spectra. A method to calculate $LET\infty$ in water from the measured LET has been elaborated. Dose rate in water and dose equivalent rate have been calculated. The energy and particle composition of the radiation field produced by the interaction of GCR with the Al walls of a spacecraft model has been determined and the response of MIDAS in this radiation field has been investigated.
