pp. 1447-1453
S&M1438 Research Paper of Special Issue https://doi.org/10.18494/SAM.2017.1625 Published: October 18, 2017 Evaluation of Wavelength-Dependent Detection Efficiency of Neutron-Sensitive Microchannel Plate Detector [PDF] Kenichi Watanabe, Triestino Minniti, Winfried Kockelmann, Robert Dalgliesh, Genoveva Burca, and Anton S. Tremsin (Received April 7, 2017; Accepted August 21, 2017) Keywords: microchannel plate, neutron imaging detector, time-of-flight energy analysis, detection efficiency, detector activation
The microchannel plate (MCP)/Timepix is one of the promising candidates for high-performance neutron imaging detectors. Since it is important to know the detection efficiency to plan experiments, we propose simple procedures to evaluate the wavelength-dependent detection efficiency of the MCP/Timepix detector. The wavelength-dependent efficiency curve can easily be evaluated by comparison with the neutron-induced prompt gamma-ray counts. The efficiency increases with the wavelength up to roughly 5 Å and eventually saturates. All neutrons with a wavelength of more than 5 Å are fully absorbed in the neutron-sensitive MCP. The activation effect in the MCP/Timepix detector is also investigated. We confirmed additional counts originating from the activation effect of aluminum, which was used in the detector entrance window. The contribution of the additional counts due to the detector activation was less than 10−4 compared with the neutron counts.
Corresponding author: Kenich WatanabeCite this article Kenichi Watanabe, Triestino Minniti, Winfried Kockelmann, Robert Dalgliesh, Genoveva Burca, and Anton S. Tremsin, Evaluation of Wavelength-Dependent Detection Efficiency of Neutron-Sensitive Microchannel Plate Detector, Sens. Mater., Vol. 29, No. 10, 2017, p. 1447-1453. |