Optimization study of a new β +- γ coincidence positron annihilation lifetime spectrometer using Geant4

被引：1

作者：

Xu, W. ^{[1
]}

Li, Y. H. ^{[1
]}

Pan, Z. W. ^{[1
]}

Liu, J. D. ^{[1
]}

Zhang, H. J. ^{[1
]}

Ye, B. J. ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China

来源：

JOURNAL OF INSTRUMENTATION | 2024年 / 19卷 / 06期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Detection of defects; Detector modelling and simulations I (interaction of radiation with matter; interaction of photons with matter; interaction of hadrons with matter; etc); Timing detectors; Photon detectors for UV; visible and IR photons (solid-state) (PIN diodes; APDs; Si-PMTs; G-APDs; CCDs; EBCCDs; EMCCDs; CMOS imagers; BETA(+)-GAMMA COINCIDENCE; ENERGY SELECTION; RESOLUTION; THERMALIZATION; SIMULATION; TIME;

D O I：

10.1088/1748-0221/19/06/P06044

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Positron annihilation lifetime (PAL) spectroscopy is a unique method for characterizing atomic -scale defects and ultramicropores in materials. The conventional PAL spectrometer adopts the y - y coincidence principle, and its performance, especially the coincidence counting rate (CCR), can hardly be further increased. Another coincidence principle, f3 + - y coincidence, has the potential to simultaneously improve the CCR and coincidence time resolution (CTR) of PAL spectrometers. However, early f3 + - y coincidence PAL spectrometers have not been widely applied due to the considerable room for improvement in their performance. In this work, we proposed a new f3 + - y coincidence PAL spectrometer utilizing silicon photomultiplier (SiPM) array as the positron detector and conducted a comprehensive optimization of its structure with the aim of achieving a breakthrough in performance. The effects of start signal threshold and structure parameters on its CTR, CCR, and proportion of source contribution ( P SC ) were studied using Geant4. The simulation results show that, with a 68 Ge positron source of 30 mu Ci, the optimized f3 + - y coincidence PAL spectrometer can achieve an extremely high CCR exceeding 10000 counts per second (cps) and an outstanding CTR below 160 picoseconds (ps) while maintaining a low P SC below 12%. This study provides valuable guidance for constructing high-performance f3 + - y coincidence PAL spectrometers.

引用

页数：20

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