Neutron imaging detector based on the ￥mu-PIC micro-pixel chamber
Neutron imaging detector based on the ￥mu-PIC micro-pixel chamber
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基于¥mu-PIC微像素室的中子成像探测器
DOI：
10.1016/j.nima.2012.08.036
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Ueno
中科院分区：
文献类型：
--
作者：
J.D. Parker;K. Hattori;H. Fujioka;M. Harada;S. Iwaki;S. Kabuki;Y. Kishimoto;H. Kubo;S. Kurosawa;K. Miuchi;T. Nagae;H. Nishimura;T. Oku;T. Sawano;T. Shinohara;J. Suzuki;A. Takada;T. Tanimori;K. Ueno
我们研制了一种时间分辨中子成像探测器原型，该探测器采用微像元室（μPIC）和基于现场可编程门阵列的数据采集系统，用于高强度中子源的中子照相。原型系统的有效面积为10× 10cm 2，工作气压为2atm，测量了每个中子诱发事件的能量沉积（通过时间超过阈值）和三维径迹，从而提高了中子相互作用点的重建精度。采用简单的位置重建算法，空间分辨率达到349±36μm，并有望进一步提高。详细的跟踪可以很好地抑制背景伽马射线，从而使有效的伽马灵敏度达到10− 12或更低，同时还能稳定、可靠地识别中子。该探测器的时间分辨率为0.6μs。
We have developed a prototype time-resolved neutron imaging detector employing the micro-pixel chamber (μPIC), a micro-pattern gaseous detector, coupled with a field programmable gate array-based data acquisition system for applications in neutron radiography at high-intensity neutron sources. The prototype system, with an active area of 10×10cm2and operated at a gas pressure of 2atm, measures both the energy deposition (via time-over-threshold) and three-dimensional track of each neutron-induced event, allowing the reconstruction of the neutron interaction point with improved accuracy. Using a simple position reconstruction algorithm, a spatial resolution of 349±36μm was achieved, with further improvement expected. The detailed tracking allows strong rejection of background gamma-rays, resulting in an effective gamma sensitivity of 10−12or less, coupled with stable, robust neutron identification. The detector also features a time resolution of 0.6μs.