DOI QR코드

DOI QR Code

Fundamental approach to development of plastic scintillator system for in situ groundwater beta monitoring

  • Lee, UkJae (Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Choi, Woo Nyun (Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Bae, Jun Woo (Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Hee Reyoung (Nuclear Engineering, Ulsan National Institute of Science and Technology)
  • 투고 : 2018.12.18
  • 심사 : 2019.05.03
  • 발행 : 2019.10.25

초록

The performance of a plastic scintillator for use in an in situ measurement system was analyzed using simulation and experimental methods. The experimental results of four major pure beta-emitting radionuclides, namely $^3H$, $^{14}C$, $^{32}P$, and $^{90}Sr/^{90}Y$, were compared with those obtained using a Monte Carlo N-particle (MCNP) code simulation. The MCNP simulation and experimental results demonstrated good agreement for $^{32}P$ and $^{90}Sr/^{90}Y$, with a relative difference of 1.95% and 0.43% between experimental and simulation efficiencies for $^{32}P$ and $^{90}Sr/^{90}Y$, respectively. However, owing to the short range of beta particles in water, the efficiency for $^{14}C$ was extremely low, and $^3H$ could not be detected. To directly measure the low-energy beta radionuclides considering their short range, a system where the source could flow directly to the scintillator was developed. The optimal thickness of the plastic scintillator was determined based on the suggested diameter. Results showed that the detection efficiency decreases with an increase in the depth of the water. The detection efficiency decreased drastically to approximately 10 cm, and the tendency was gradually constant.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea

참고문헌

  1. S.W. DUCE, et al., In situ radiation detection demonstration, in: WM'00 Conference, Tucson, AZ, February 27, March 2 2000.
  2. S.J. Ko, et al., Radiation Detection & Measurement, 2001.
  3. J.W. Coltman, F.H. Marshall, Photomultiplier radiation detector, Nucleonics 1 (3) (1947) 58-64.
  4. B.K. Seo, Z.H. Woo, G.H. Kim, K.W. Lee, D.G. Lee, Development of ZnS (Ag)/plastic dual scintillator sheet for simultaneous alpha-and beta-ray counting, Anal. Sci. Technol. 21 (2) (2008) 117-122.
  5. HAMAMATSU, Photomultiplier Tube R878". www.hamamatsu.com.
  6. Saint-Gobain Crystals, Organic Scintillation Materials, 2014.
  7. L.A. Eriksson, C.M. Tsai, Z.H. Cho, C.R. Hurlbut, Comparative studies on plastic scintillators-applications to low energy high rate photon detection, Nucl. Instrum. Methods 122 (1974) 373-376. https://doi.org/10.1016/0029-554X(74)90503-5
  8. American Society for Testing and Materials, Standard Practice for the Measurement of Radioactivity.
  9. H. Cember, T.E. Johnson, "INTRODUCTION TO Health Physics", Medical, 2009.
  10. Ortec Inc. "Model 556H High Voltage Power Supply Operating and Service Manual".
  11. Ortec Inc. "Model 855 Dual Spectroscopy Amplifier Operating and Service Manual".
  12. Ortec Inc. "Model 551 Timing Single-Channel Analyzer Operating and Service Manual".
  13. Ortec Inc. "EASY-MCA-8KTM EASY-MCA-2ktm Digital Gamma-Ray Spectrometer User's Manual".
  14. Ortec Inc, Experiment 13, Gamma-Gamma Coincidence with Angular Correlation. www.ortec-online.com.
  15. T. Goorley, M. James, T. Booth, F. Brown, J. Bull, L.J. Cox, J. Durkee, J. Elson, M. Fensin, R.A. Forster, J. Hendricks, Initial MCNP6 release overview, Nucl. Technol. 180 (3) (2012) 298-315. https://doi.org/10.13182/NT11-135
  16. R.G. Williams, C.J. Gesh, R.T. Pagh, Compendium of Material Composition Data for Radiation Transport Modeling, Pacific Northwest National Lab.(PNNL), Richland, WA (United States), 2006 Oct 31.
  17. Ministry of Education, Science and Technology, "Radionuclide information", 2008.
  18. ALAEI, Parham, Introduction to health physics, Med. Phys. 35 (12) (2018), 5959-5959. https://doi.org/10.1118/1.3021454
  19. Korea Research Institute of Standards and Science, Instruction for Expressing Measurement Uncertainty, 2010.
  20. W.G. Cross, C.G. Soares, S. Vynckier, K. Weaver, Dosimetry of beta rays and low-energy photons for brachytherapy with sealed sources, ICRU report 72, J. ICRU 4 (2004). J ICRU.

피인용 문헌

  1. The Simulation of In-Situ Groundwater Detector Response as a Means of Identifying Beta Emitting Radionuclides by Linear Regression Analysis vol.21, pp.17, 2019, https://doi.org/10.3390/s21175732
  2. Fluorescent organic particle doped polymer-based gel dosimeter for neutron detection vol.180, 2019, https://doi.org/10.1016/j.apradiso.2021.110067