Neutron imaging detector based on the muPIC micro-pixel chamber
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

TL;DR
This paper presents a prototype neutron imaging detector using muPIC micro-pixel chambers, achieving high spatial and time resolution, effective gamma-ray rejection, and suitability for high-intensity neutron source applications.
Contribution
The development of a time-resolved neutron imaging detector with detailed tracking and background rejection capabilities using muPIC technology.
Findings
Spatial resolution of 349 microns achieved
Gamma sensitivity of 10^-12 or less demonstrated
Time resolution of 0.6 microseconds achieved
Abstract
We have developed a prototype time-resolved neutron imaging detector employing the micro-pixel chamber (muPIC), 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 10cm x 10cm and operated at a gas pressure of 2 atm, measures both the energy deposition (via time-over-threshold) and 3-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 +/- 36 microns was achieved, with further improvement expected. The detailed tracking allows strong rejection of background gamma-rays, resulting in an effective gamma sensitivity of 10^-12 or less, coupled with stable,…
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