Characteristics of an X-ray imaging detector with double capillary plates
Characteristics of an X-ray imaging detector with double capillary plates
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双毛细管板 X 射线成像探测器的特点
DOI：
10.1016/j.nima.2003.08.048
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
N. Saitoh
中科院分区：
文献类型：
--
作者：
H. Sakurai;S. Gunji;F. Tokanai;T. Maeda;N. Ujiie;N. Saitoh
建立了一种双毛细管板毛细管气体正比计数器（CGPC），用于研究高气体增益下X射线光电子径迹的成像。双CGPC充入1个大气压的Ar+8%CH_4 +2%TMA的潘宁混合气体，气体增益可达4×104。光输出与气体增益成正比。从上毛细管到下毛细管的电子提取率为1.2%。双CGPC的能量分辨率为35%的电荷信号和40%的光信号为5.9 keV的X射线。在气体增益为2× 10 ~ 4时，用双CGPC获得了22 keV X射线光电子径迹的清晰图像。通过对光电子径迹沿着能量存款的分析，指出光电子径迹有两个亮区和一个亮度较低的鞍区。在高气体增益下获得的光电子径迹图像的结构对于成像型X射线偏振计的应用是重要的。
A capillary gas proportional counter (CGPC) with the double capillary plates has been constructed to investigate the image of X-ray photoelectron tracks at high gas gain. The double CGPC filled with a Penning gas mixture of Ar+8%CH4+2%TMA at 1 atm can operate at a gas gain of up to 4×104. The light yield was proportional to the gas gain. The electron extraction rate is 1.2% from the upper capillary to the lower one. The energy resolutions of the double CGPC were 35% for charge signals and 40% for light signals for 5.9 keV X-rays. With the double CGPC, clear images of photoelectron tracks were obtained for 22 keV X-rays at a gas gain of 2×104. From an analysis of the energy deposit along a photoelectron track, it was indicated that the track has two bright portions and a saddle portion with low brightness. The structure of a photoelectron track image obtained at high gas gain is important for application to an imaging type X-ray polarimeter.