Study of the energy resolution by analyzing the pulse shape from the gas proportional counter

通过分析气体正比计数器的脉冲形状研究能量分辨率

• 批准号: 06452023
• 负责人: TSUNEMI Hiroshi
• 金额: $ 2.37万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452023/
• 关键词: Gas proprtional Counter; Energy resolution; Pulse shape; 半導体検出器; X線偏光; 信号波形; 比例計数管; 信号波形解析; ディジタルフィルター

The basic priciple for the X-ray detection id the same both to the gas proportional counter and to the solid state detector. The former has electron avalanche process while the latter has not. Therefore, the behavior of the primary electron cloud can be easily studied in the solid state detector. We studied the signal shape of the solid state detector and found the electron cloud loss through the absorption at the entrance window as well as the non-linearity at the Si-K edge energy. We obtained the detailed understanding of the behavior of the primary electron cloud. The detailed study of the pulse shape from the gas proportional counter revealed that the pulse shape depends on the X-ray polarization. This is quite an unexpected result. The gas proportional counter surely functions as an X-ray polarimeter by employing the detailed study of the pulse shape. We got a template of the X-ray pulse shape by summing up many X-ray induced signals. Our new approach is to extract the energy information by comparing the template with the unknown pulse. This surely enables us to get more information on the incident X-ray than that used in the conventional method which only measures the maximum pulse height. We got the energy resolution of 17.0% which is statistically equal to that of 17.4% by using the conventional method. The gas avalancheinside the gas proportional counter improves the signal to noise ratio so that an extra technique does not needed.

气体正比计数管和固体探测器的X射线探测基本原理相同。前者有电子雪崩过程，后者没有。因此，初级电子云的行为可以很容易地在固态探测器中进行研究。我们研究了固态探测器的信号形状，发现了电子云在入射窗处的吸收损失以及在Si-K边缘能量处的非线性。我们对原电子云的行为有了详细的了解。对气体正比计数器的脉冲波形的详细研究表明，脉冲波形取决于X射线的偏振。这是一个相当出乎意料的结果。通过对脉冲形状的详细研究，确定了气体正比计数管作为X射线偏振计的功能。通过对多个X射线诱导信号的叠加，得到了一个X射线脉冲波形的模板。我们的新方法是通过比较模板和未知脉冲来提取能量信息。这无疑使我们能够获得更多的信息，入射X射线比传统的方法，只测量最大脉冲高度。我们得到的能量分辨率为17.0%，这与使用常规方法的17.4%在统计学上相当。气体正比计数器内部的气体雪崩提高了信噪比，因此不需要额外的技术。

项目成果

Kiyoshi Hayashida, Noriyuki Miura, Hiroshi Tsunemi, Kenichi Torii, Hiroyuki Murakami, Yoshiaki Ohno: "X-ray Polarimetry with a Conventional Gas Proportional Counter through Rise-Time Analysis" Nucl.Instrum and Meth.(to be subucitted. (1996)

Kiyoshi Hayashida、Noriyuki Miura、Hiroshi Tsunemi、Kenichi Torii、Hiroyuki Murakami、Yoshiaki Ohno：“通过上升时间分析使用传统气体比例计数器进行 X 射线偏振测量”Nucl.Instrum 和 Meth.（待subucited。（1996 年）

K. Torii,H. Tsunemi,E. Miyata,and K. Hayashida: "Some characteristics of a solid state detector in the soft X-ray region" Nucl. Instrum. and Meth.A361. 364-371 (1995)

K.鸟居，H.

K. Hayashida,N. miura,H. Tsunemi,K. Torii,H. Murakami,T. Ohno: "X-ray Polarimetry with a Comentional Gas Proportional Counter through Rise-Time Analysis" Nucl. Instrum. and Meth.(1996)

K.林田，N.

K.Torii, H.Tsunemi, E.Miyata and K.Hayashida: "Some characteristics of a solid state detector in the soft X-ray region" Nucl.Instrum and Meth.A361. 364-371 (1995)

K.Torii、H.Tsunemi、E.Miyata 和 K.Hayashida：“软 X 射线区域固态探测器的一些特性”Nucl.Instrum 和 Meth.A361。

K.TRII: "Some characteristics of a Solid State Deteceor in the Soft X-ray regiou" Nucleav Inserament and Methods. (in press). (1995)

K.TRII：“软 X 射线区域固态探测器的一些特性”核切割插入和方法。