Journal of Radiation Protection and Research

  • 제47권4호
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  • Pages.214-225
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  • 2022
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  • 2508-1888(pISSN)
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  • 2466-2461(eISSN)
대한방사선방어학회 (The Korean Association for Radiation Protection)
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Comparison of Characteristics of Gamma-Ray Imager Based on Coded Aperture by Varying the Thickness of the BGO Scintillator

  • Seoryeong Park (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Mark D. Hammig (Department of Nuclear Engineering & Radiological Sciences, University of Michigan) ;
  • Manhee Jeong (Department of Electrical and Energy Engineering, Jeju National University)
  • 투고 : 2022.08.24
  • 심사 : 2022.11.06
  • 발행 : 2022.12.31
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초록

Background: The conventional cerium-doped Gd2Al2Ga3O12 (GAGG(Ce)) scintillator-based gamma-ray imager has a bulky detector, which can lead to incorrect positioning of the gammaray source if the shielding against background radiation is not appropriately designed. In addition, portability is important in complex environments such as inside nuclear power plants, yet existing gamma-ray imager based on a tungsten mask tends to be weighty and therefore difficult to handle. Motivated by the need to develop a system that is not sensitive to background radiation and is portable, we changed the material of the scintillator and the coded aperture. Materials and Methods: The existing GAGG(Ce) was replaced with Bi4Ge3O12 (BGO), a scintillator with high gamma-ray detection efficiency but low energy resolution, and replaced the tungsten (W) used in the existing coded aperture with lead (Pb). Each BGO scintillator is pixelated with 144 elements (12 × 12), and each pixel has an area of 4 mm × 4 mm and the scintillator thickness ranges from 5 to 20 mm (5, 10, and 20 mm). A coded aperture consisting of Pb with a thickness of 20 mm was applied to the BGO scintillators of all thicknesses. Results and Discussion: Spectroscopic characterization, imaging performance, and image quality evaluation revealed the 10 mm-thick BGO scintillators enabled the portable gamma-ray imager to deliver optimal performance. Although its performance is slightly inferior to that of existing GAGG(Ce)-based gamma-ray imager, the results confirmed that the manufacturing cost and the system's overall weight can be reduced. Conclusion: Despite the spectral characteristics, imaging system performance, and image quality is slightly lower than that of GAGG(Ce), the results show that BGO scintillators are preferable for gamma-ray imaging systems in terms of cost and ease of deployment, and the proposed design is well worth applying to systems intended for use in areas that do not require high precision.

키워드

과제정보

This work is supported by Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KoFONS) using the financial resource granted by the Nuclear Safety and Security Commission (NSSC) of the Republic of Korea (No. 2204019).

참고문헌

  1. International Atomic Energy Agency. PRIS Power Reactor Information System: age distribution [Internet]. Vienna, Austria: International Atomic Energy Agency; 2020 [cited 2022 Dec 20]. Available from: https://pris.iaea.org/pris/worldstatistics/operationalbyage.aspx.
  2. Mladenov A, Stankov D, Nonova T, Krezhov K. Radiation protection, radioactive waste management and site monitoring at the nuclear scientific experimental and educational centre IRTSofia at INRNE-BAS. Radiat Prot Dosimetry. 2014;162(1-2):176-181. https://doi.org/10.1093/rpd/ncu254
  3. Ziock KP, Collins JW, Fabris L, Gallagher S, Horn BK, Lanza RC, et al. Source-search sensitivity of a large-area, coded-aperture, gamma-ray imager. IEEE Trans Nucl Sci. 2006;3(3):1614-1621.
  4. Cieslak MJ, Gamage KA, Glover R. Coded-aperture imaging systems: past, present and future development: a review. Radiat Meas. 2016;92:59-71.
  5. Wahl CG, Kaye WR, Wang W, Zhang F, Jaworski JM, King A, et al. The Polaris-H imaging spectrometer. Nucl Instrum Methods Phys Res A. 2015;784:377-381. https://doi.org/10.1016/j.nima.2014.12.110
  6. Vetter K, Barnowksi R, Haefner A, Joshi TH, Pavlovsky R, Quiter BJ. Gamma-ray imaging for nuclear security and safety: towards 3-D gamma-ray vision. Nucl Instrum Methods Phys Res A. 2018; 878:159-168. https://doi.org/10.1016/j.nima.2017.08.040
  7. Amgarou K, Paradiso V, Patoz A, Bonnet F, Handley J, Couturier P, et al. A comprehensive experimental characterization of the iPIX gamma imager. J Instrum. 2016;11(08):P08012. https://doi.org/10.1088/1748-0221/11/08/P08012
  8. Montemont G, Bohuslav P, Dubosq J, Feret B, Monnet O, Oehling O, et al. NuVISION: a portable multimode gamma camera based on HiSPECT imaging module. Atlanta, GA: Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC); 2017 Oct 21-28; Atlanta. GA. pp. 1-3.
  9. International Atomic Energy Agency. 2016 Technology Demonstration Workshop (TDW) on gamma imaging-external [Internet]. Vienne, Austria: International Atomic Energy Agency; 2017 [cited 2022 Dec 20]. Available from: https://phdsco.com/wpcontent/uploads/2020/04/2016_Technology_Demonstration_Workshop_TDW_on_Gamma_Imaging-External.pdf.
  10. Jeong M, Van B, Wells BT, Lawrence JD, Hammig MD. Comparison between pixelated scintillators: CsI(Tl), LaCl3(Ce) and LYSO(Ce) when coupled to a silicon photomultipliers array. Nucl Instrum Methods Phys Res A. 2018;893:75-83. https://doi.org/10.1016/j.nima.2018.03.024
  11. Epic-Crystal. BGO scintillator [Internet]. Kunshan, China: Epic-Crystal Ltd.; 2021 [cited 2022 Dec 20]. Available from: https://www.epic-crystal.com/download-center/index_2.html.
  12. Joshi S. Coded aperture imaging applied to pixelated CdZnTe detectors [dissertation]. Ann Arbor, MI: University of Michigan; 2014.
  13. Jeong M, Hammig MD. Comparison of gamma ray localization using system matrixes obtained by either MCNP simulations or ray-driven calculations for a coded-aperture imaging system. Nucl Instrum Methods Phys Res A. 2020;954:161353. https://doi.org/10.1016/j.nima.2018.10.031
  14. Semiconductor Components Industries. Silicon potomultipliers (SiPM) [Internet]. Phoenix, AZ: Semiconductor Components Industries; 2021 [cited 2022 Dec 20]. Available from: https://www.onsemi.com/products/sensors/photodetectors-sipmspad/silicon-photomultipliers-sipm.
  15. Jeong M, Van B, Wells BT, D'Aries LJ, Hammig MD. Scalable gamma-ray camera for wide-area search based on silicon photomultipliers array. Rev Sci Instrum. 2018;89(3):033106. https://doi.org/10.1063/1.5016563
  16. Park S, Boo J, Hammig M, Jeong M. Impact of aperture-thickness on the real-time imaging characteristics of coded-aperture gamma cameras. Nuclear Engineering and Technology. 2021;53 (4):1266-1276. https://doi.org/10.1016/j.net.2020.09.012
  17. Yoshino M. Study on a novel Compton-PET hybrid camera using newly developed scintillators for simultaneous imaging of PET/SPECT application [dissertation]. Sendai, Japan: Tohoku University; 2018.
  18. Jeong M, Hammig M. Development of hand-held coded-aperture gamma ray imaging system based on GAGG (Ce) scintillator coupled with SiPM array. Nucl Eng Technol. 2020;52(11): 2572-2580. https://doi.org/10.1016/j.net.2020.04.009
  19. Yan Y, Cao W, Li S. Block-based adaptive image watermarking scheme using just noticeable difference. Proceedings of 2009 IEEE International Workshop on Imaging Systems and Techniques; 2009 May 11-12; Shenzhen, China. pp. 377-380.
  20. Hore A, Ziou D. Image quality metrics: PSNR vs. SSIM. Proceedings of 2010 20th International Conference on Pattern Recognition; 2010 Aug 23-26; Istanbul, Turkey. pp. 2366-2369.
  21. Wang Z, Bovik AC, Sheikh HR, Simoncelli EP. Image quality assessment: from error visibility to structural similarity. IEEE Trans Image Process. 2004;13(4):600-612. https://doi.org/10.1109/TIP.2003.819861