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KMID : 0364920140390040199
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Journal of Radiation Protection and Research
2014 Volume.39 No. 4 p.199 ~ p.205
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The development of conductive 10B thin film for neutron monitoring
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Lim Chang-Hwy
Kim Jong-yul
Lee Su-hyun
Jung Yong-ju
Choi Young-Hyeon
Baek Cheol-Ha
Moon Myung-Kook
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Abstract
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In the field of neutron detections, 3He gas, the so-called “the gold standard,” is the most widely used material for neutron detections because of its high efficiency in neutron capturing. However, from variable causes since early 2009, 3He is being depleted, which has maintained an upward pressure on its cost. For this reason, the demands for 3He replacements are rising sharply. Research into neutron converting materials, which has not been used well due to a neutron detection efficiency lower than the efficiency of 3He, although it can be chosen for use in a neutron detector, has been highlighted again. 10B, which is one of the 3He replacements, such as BF3, 6Li, 10B, Gd2O2S, is being researched by various detector development groups owing to a number of advantages such as easy gamma-ray discrimination, non- toxicity, low cost, etc. One of the possible techniques for the detection is an indirect neutron detection method measuring secondary radiation generated by interactions between neutrons and 10B. Because of the mean free path of alpha particle from interactions that are very short in a solid material, the thickness of 10B should be thin. Therefore, to increase the neutron detection efficiency, it is important to make a 10B thin film. In this study, we fabricated a 10B thin film that is about 60 um in thickness for neutron detection using well-known technology for the manufacturing of a thin electrode for use in lithium ion batteries. In addition, by performing simple physical tests on the conductivity, dispersion, adhesion, and flexibility, we confirmed that the physical characteristics of the fabricated 10B thin film are good. Using the fabricated 10B thin film, we made a proportional counter for neutron monitoring and measured the neutron pulse height spectrum at a neutron facility at KAERI. Furthermore, we calculated using the Monte Carlo simulation the change of neutron detection efficiency according to the number of thin film layers. In conclusion, we suggest a fabrication method of a 10B thin film using the technology used in making a thin electrode of lithium ion batteries and made the 10B thin film for neutron detection using suggested method.
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KEYWORD
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10B thin film, Neutron, Proportional counter, MCNP6
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