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KMID : 1151820170110030171
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Journal of the Korean Society of Radiology
2017 Volume.11 No. 3 p.171 ~ p.175
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The Study on Design of Semiconductor Detector for Checking the Position of a Radioactive Source in an NDT
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Kim Kyo-Tae
Kim Joo-Hee
Han Moo-Jae
Heo Ye-Ji
Ahn Ki-Jung
Park Sung-Kwang
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Abstract
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In the non-destructive inspection field, we invest a lot of time and resources in developing the radiation source system to ensure the safety of the workers. However, the probability of accidents is still high. In order to prevent potential radiation accidents in advance, it is necessary to directly verify the position of the radiation source, but the research is still insufficient. In this study, we developed a monitoring system that can detect the position of the radiation source in the source guide tube in the gamma-ray irradiator. The characteristics of the radiation detector are estimated by monte carlo simulation. As a result, the radiation detector for Ir-192 gamma-ray energy was analyzed to have secondary electron equilibrium at 150 μm regardless of the semiconductor material. Also, it is expected that the gamma ray response characteristic is the best in HgI2. These results are expected to be used as a basis for determining the optimal thickness of the radiation detector located in the detection part of the future monitoring system. In addition, when developing a monitoring system based on this, radiation workers can easily recognize the danger and secure safety, as well as prevent and preemptively respond to potential radiation accidents.
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KEYWORD
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Non-destructive inspection, Gamma-ray projector, Radioactive source, Solid-state detector, Semiconductor materials
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