Sensitivity and linearity of optical fiber-based neutron detectors using small 6Li-based scintillators

被引:12
作者
Ishikawa, Akihisa [1 ]
Yamazaki, Atsushi [1 ]
Watanabe, Kenichi [1 ]
Yoshihashi, Sachiko [1 ]
Uritani, Akira [1 ]
Fukuda, Kentaro [2 ]
Koike, Akifumi [3 ]
Ogawara, Ryo [4 ]
Suda, Mitsuru [4 ]
Hamano, Tsuyoshi [4 ]
机构
[1] Nagoya Univ, Dept Appl Energy Engn, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648603, Japan
[2] Tokuyama Corp, 1-1 Harumi Cho, Shunan, Yamaguchi 7450024, Japan
[3] ANSeeN Inc, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328011, Japan
[4] Natl Inst Radiol Sci, Dept Accelerator & Med Phys, Inage Ku, 4-9-1 Anagawa, Chiba 2638555, Japan
关键词
Optical fiber-based neutron detector; Li-6-based scintillator; Eu:LiCaAlF6 crystal; LiF/Eu:CaF2 eutectic crystal; Real-time measurement; CAPTURE THERAPY;
D O I
10.1016/j.nima.2018.11.120
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We developed optical fiber-based neutron detectors that use small pieces of Li-6-based scintillators, namely, Eu:LiCaAlF6 crystals and LiF/Eu:CaF2 eutectics. Considering that these elements have high light yields (more than 10,000 photons/neutron), they can produce pulse height spectra with clear peaks even when using optical fiber light guides. To adjust the neutron sensitivity, we controlled the amount of Li-6 in the scintillator. We fabricated three different detectors using Eu:LiCaAlF6 and LiF/Eu:CaF2 with various amounts of Li-6 and then evaluated the neutron sensitivity of each detector. This approach confirmed that there was a linear relationship between the neutron sensitivity and amount of Li-6, thus implying that the Li-6 mass measured by a high-precision balance could be a good metric of neutron sensitivity. We also checked the linearity of the output of the detector at relatively high neutron fluxes by using an accelerator-based neutron source. Although the detectors showed saturation behavior at high count rate, we were able to cover a relatively wide dynamic range by combining multiple detectors using different amounts of Li-6. After correcting for the pulse height distortion and count loss due to pile-up events, we were able to confirm the linearity of the detectors up to a count rates of 100 kcps.
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页数:5
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