基于闪烁体探测器的高时空分辨率X射线与伽马射线成像
High Temporal and Spatial Resolution X-Ray and Gamma-Ray Imaging using an Event-Mode Scintillator-Based Detector
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中文总结 AI 辅助
本研究将用于中子成像的LumaCam探测器改进后用于X射线与伽马射线成像，测试显示其空间分辨率达50 μm、时间分辨率低至15 ns，具备能量选择成像潜力，适用于快速过程的高分辨率成像。
中文摘要 AI 辅助
LumaCam探测器是一种新型事件模式成像探测器，基于闪烁体屏开发，最初用于中子成像应用。其以事件模式运行，可在空间和时间维度上重建入射粒子与闪烁体屏的单个相互作用，同时提供高空间与时间分辨率。本研究证明了LumaCam探测器适用于X射线和伽马射线成像。采用120 kV加速电压的X射线源进行的首次测试显示，探测器空间分辨率低至50 μm，时间分辨率约为1 μs。这种组合使LumaCam探测器特别适合在有限锥束放大下对具有高空间分辨率的快速过程成像。该探测器从中子检测版本的最显著改进在于闪烁体屏。为进一步探究LumaCam探测器在高能光子应用中的潜力，使用伽马射线源采用不同闪烁体屏材料进行了额外测量，结果显示时间分辨率显著提升，低至约15 ns。此外，部分闪烁体在光子多重性谱中还表现出显著的能量敏感性，凸显了LumaCam探测器在能量选择型X射线和伽马射线成像中的潜力。
英文摘要
LumaCam detectors are a novel type of event-mode imaging detectors based on scintillator screens that have been developed recently for neutron imaging applications. They operate in an event-mode in which individual interactions of the incoming particles with the scintillator screen are reconstructed in both space and time, providing simultaneous high spatial and temporal resolution. In this work, we demonstrate the applicability of LumaCam detectors to X-ray and gamma-ray imaging. First tests with a 120 kV acceleration voltage X-ray source show a spatial detector resolution down to 50 um and the temporal resolution is estimated to be ~1 us. This combination makes LumaCam detectors especially suitable for imaging fast processes with high spatial resolution with limited cone beam magnification. The most significant adaption of the detector from the version for neutron detection is the scintillator screen. To further investigate the potential of LumaCam detectors for high-energy photon applications, additional measurements employing different scintillator screen materials have been carried out using gamma ray sources. The results show significant improvements in the temporal resolution with values as low as ~15 ns. In addition, some scintillators also show significant energy sensitivity in the photon multiplicity spectrum, highlighting the potential of LumaCam detectors for energy-selective X-ray and gamma-ray imaging.
