2025年"核理安邦“联合博士生学术论坛

空间应用像素CdZnTe探测器的质子诱导辐射损伤研究

Not scheduled

12m

Location: 清华大学核能与新能源技术研究院

口头报告 核技术与应用、医学物理与工程 核技术与应用、医学物理与工程

Speaker

昊 常 (清华大学)

Abstract

High-performance pixelated CZT detectors that achieve 3D position sensitivity are promising candidates for use in Compton imaging telescopes. We proposed to use pixelated CZT detectors in the MeV Astrophysical Spectroscopic Surveyor(MASS), which is a large area Compton telescope. Nevertheless, the presence of high-energy protons in space can lead to radiation damage in pixelated CZT detectors, causing their performance to degrade gradually. Using non-ionizing energy loss (NIEL), this study develops a method that quantitatively evaluates the radiation damage of detectors in space. To verify the method, this study irradiated two 2 × 2 × 1 cm^3 pixelated CZT detectors with 100 MeV protons at fluences ranging from 3 × 10^7 p+/cm2 to 3 × 10^9 p+/cm2 under two bias sets. When the proton fluence reaches 3 × 10^9 p+/cm2, the energy resolution of the detectors significantly deteriorates to 3.8% at 511 keV (FWHM/E), even after post-correction. Finally, this study provides engineering considerations for their application in space.

摘要

高性能3维位置灵敏的像素CZT探测器在康普顿成像望远镜中具有很大应用前景。我们提出在MeV天体物理光谱仪（MASS）中使用像素CZT探测器，这是一个大面积的康普顿望远镜。然而，空间中高能质子会导致像素CZT探测器的辐射损伤，导致探测器性能逐渐下降。利用非电离能量损失（NIEL）方法，提出了一种定量评估空间探测器辐射损伤的方法。为了验证该方法，本研究用100 MeV质子辐照了两个2×2×1 cm^3像素CZT探测器两种不同的偏压条件下。辐照累计通量范围为3×10^7 p+/cm2到3×10^9 p+/cm2。当质子累计通量为3×10^9p+/cm2时，探测器的能量分辨率在511keV（FWHM/E）时显著下降至3.8%。最后，本研究为其在空间的应用提供了工程考虑。