Nuclear Engineering and Technology

  • 제50권6호
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  • Pages.923-928
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  • 2018
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Investigation of nuclear material using a compact modified uniformly redundant array gamma camera

  • Lee, Taewoong (Health Science Research Center, Korea University) ;
  • Kwak, Sung-Woo (Korea Institute of Nuclear Non-proliferation and Control) ;
  • Lee, Wonho (School of Health and Environmental Science)
  • 투고 : 2017.09.01
  • 심사 : 2018.04.04
  • 발행 : 2018.08.25
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초록

We developed a compact gamma camera based on a modified uniformly redundant array coded aperture to investigate the position of a $UO_2$ pellet emitting characteristic X-rays (98.4 keV) and ${\gamma}-rays$ (185.7 keV). Experiments using an only-mask method and an antimask subtractive method were conducted, and the maximum-likelihood expectation maximization algorithm was used for image reconstruction. The images obtained via the antimask subtractive method were compared with those obtained using the only-mask method with regard to the signal-to-noise ratio. The reconstructed images of the antimask subtractive method were superior. The reconstructed images of the characteristic X-rays and the ${\gamma}-rays$ were combined with the obtained image using the optical camera. The combined images showed the precise position of the $UO_2$ pellet. According to the self-absorption ratios of the nuclear material and the minimum number of effective events for image reconstruction, we estimated the minimum detection time depending on the amount of nuclear material.

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