Studies of an X-ray imaging detector based on THGEM and CCD camera
Studies of an X-ray imaging detector based on THGEM and CCD camera
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DOI：
10.1007/s41605-018-0058-y
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发表时间：
2018-05
影响因子：
0.6
通讯作者：
Zhi-yuan Peng;Yun-ting Gu;Yu-guang Xie;Wenqi Yan;Hang Zhao;Geng-lan Li;Jiechen Jiang;H. Feng;Zhi-gang Wang;J. Lv;T. Hu;Li Zhou
中科院分区：
文献类型：
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作者：
Zhi-yuan Peng;Yun-ting Gu;Yu-guang Xie;Wenqi Yan;Hang Zhao;Geng-lan Li;Jiechen Jiang;H. Feng;Zhi-gang Wang;J. Lv;T. Hu;Li Zhou
气体探测器中电子雪崩产生的光子称为二次闪烁光，其光谱范围从紫外到可见光。因此，利用电荷耦合器件（CCD）等光传感器直接采集可见光范围内的雪崩光子成为可能。光学读出是一种基于微图案气体探测器（MPGD）的高空间分辨率二维成像新方法。在某些情况下，例如低帧率的二维成像，光学读出具有更多的优点，如简单，廉价和易于使用。为此，研制了一种基于厚层气体电子倍增器（THGEM）和普通科学CCD相机作为读出器的气体探测器，以实现X射线成像而不是电荷读出，方法和材料采用了具有灵敏面积的THGEM，以达到高增益，并选择了强光发射的混合气体。结果该光学读出THGEM探测器获得了清晰的X射线图像，空间分辨率达到了1000nm。结果表明，这种探测器具有良好的成像性能和巨大的实际应用潜力。
IntroductionThe photons generated by the electron avalanche in gaseous detectors are known as the secondary scintillation light, of which the spectrum range is from ultraviolet to visible. So it is possible to collect directly the avalanche-induced photons in visible range by light sensors, such as charged-couple device (CCD). The optical readout is a new method for 2-D imaging of high spatial resolution based on the micro-pattern gaseous detectors (MPGDs).PurposeThe traditional charge readout method for the MPGDs is complicated, expensive, and strongly depends on the technology of application-specific integrated circuit. In some cases, for example, low-frame-rate 2-D imaging, the optical readout has more advantages, such as simple, cheap and easy to use. Therefore, a gaseous detector was developed based on the thick gaseous electron multiplier (THGEM) and the ordinary scientific CCD camera as readout to realize the X-ray imaging instead of charge readout.Methods and materialsThe THGEMs withsensitive area were developed to reach high gain, and thegas mixture was chosen for strong light emission. And so a general scientific CCD can be used for readout and replacing the intensified CCD, which is more expensive than general CCD.ResultsSome clear X-ray images were obtained by this optical readout THGEM detector, and the spatial resolution achieved is. It is indicated that this kind of detectors have promising imaging capability and great potential for practical application.