A performance study of an electron-tracking Compton camera with a compact system for environmental gamma-ray observation
A performance study of an electron-tracking Compton camera with a compact system for environmental gamma-ray observation
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用于环境伽马射线观测的电子跟踪康普顿相机和紧凑系统的性能研究
DOI：
10.1088/1748-0221/10/06/c06003
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发表时间：
2015
影响因子：
1.3
通讯作者：
N. Bando and A. Nabetani
中科院分区：
文献类型：
--
作者：
T. Mizumoto;D. Tomono;A. Takada;T. Tanimori;S. Komura;H. Kubo;Y. Matsuoka;Y. Mizumura;K. Nakamura;S. Nakamura;M. Oda;J.D. Parker;T. Sawano;N. Bando and A. Nabetani
电子跟踪康普顿相机(ETCC)是一种探测器，可以在逐个事件的基础上确定入射亚MeV/MeV伽马射线事件的到达方向和能量。它是一种混合探测器，由气体时间投影室(TPC)和位置敏感闪烁相机组成，TPC是康普顿散射靶和反冲电子跟踪器，位置敏感闪烁相机吸收散射伽马射线，以测量环境中受污染土壤的伽马射线。为了测量受放射性铯(Cs)污染的土壤中的环境伽马射线，我们开发了一种便携式电池供电的ETCC系统，该系统具有紧凑的读出电路和数据采集系统，用于SILE-II实验[1，2]。我们在实验室中用几个伽马射线点源检查了伽马射线成像能力和ETCC性能。性能测试表明，该探测器的视场约为1sr，对来自视场中心的662keV伽马射线的探测效率为(9.31±0.95)×10−5，角分辨率为5.9±0.6。此外，在实验室中，该装置可以在137Cs伽马射线源上探测到0.15μSv/h，有效值为5σ。本文介绍了ETCC的技术指标和性能测试结果。此外，我们还讨论了它在环境伽马射线测量中的潜在应用。
An electron-tracking Compton camera (ETCC) is a detector that can determine the arrival direction and energy of incident sub-MeV/MeV gamma-ray events on an event-by-event basis. It is a hybrid detector consisting of a gaseous time projection chamber (TPC), that is the Compton-scattering target and the tracker of recoil electrons, and a position-sensitive scintillation camera that absorbs of the scattered gamma rays, to measure gamma rays in the environment from contaminated soil. To measure of environmental gamma rays from soil contaminated with radioactive cesium (Cs), we developed a portable battery-powered ETCC system with a compact readout circuit and data-acquisition system for the SMILE-II experiment [1, 2]. We checked the gamma-ray imaging ability and ETCC performance in the laboratory by using several gamma-ray point sources. The performance test indicates that the field of view (FoV) of the detector is about 1 sr and that the detection efficiency and angular resolution for 662 keV gamma rays from the center of the FoV is (9.31±0.95)× 10− 5 and 5.9±0.6, respectively. Furthermore, the ETCC can detect 0.15 μSv/h from a 137 Cs gamma-ray source with a significance of 5σ in 13 min in the laboratory. In this paper, we report the specifications of the ETCC and the results of the performance tests. Furthermore, we discuss its potential use for environmental gamma-ray measurements.