Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
권호 표지
DOI QR코드

DOI QR Code

Measurement of MDA of Soil Samples Using Unsuppression System and Compton Suppression of Environmental Radioactivity in Processing Technology

환경 방사능 처리기술에서의 Compton suppression 및 Unsuppression system을 이용한 토양시료의 MDA 측정

  • Kang, Suman (Department of Radiological Science, Dongeui University) ;
  • Im, Inchul (Department of Radiological Science, Dongeui University) ;
  • Lee, Jaeseung (Department of Radiological Science, Dongeui University) ;
  • Jang, Eunsung (Department of Radiation Oncology, Kosin University Gospel Hospital) ;
  • Lee, Mihyeon (Department of Radiation Safety Managment, Dong-pusan College) ;
  • Kwon, Kyungtae (Department of Radiological Science, Dongnam Health University) ;
  • Kim, Changtae (Department of Health Care managment, Dongeui University)
  • 강수만 (동의대학교 방사선학과) ;
  • 임인철 (동의대학교 방사선학과) ;
  • 이재승 (동의대학교 방사선학과) ;
  • 장은성 (고신대학교 복음병원 방사선종양학과) ;
  • 이미현 (동부산대학교 방사선 안전관리실) ;
  • 권경태 (동남보건대학교 방사선과) ;
  • 김창태 (동의대학교 의료경영학과)
  • Received : 2014.06.11
  • Accepted : 2014.10.25
  • Published : 2014.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

Compton suppression device is a device by using the Compton scattering reaction and suppress the Compton continuum portion of the spectrum, so can be made more clear analysis of gamma ray peak in the Compton continuum region. Measurements above background occurs or, radioactivity counts of radioactivity concentration value of $^{40}K$ nuclides $^{137}Cs$ and natural radioactivity artificial radioactivity detected from the surface soil sample, unwanted non-target analysis and interference peak who dotted line you know the calibration of the measurement energy is allowed to apply the (Compton suppression) non-suppressed spectrum inhibition spectrum and (Compton Unsuppression) the background to the measured value of the activity concentration value of the standard-ray source is detected relative to the peak of By measuring according to the different distances cause $^{137}Cs$, and comparative analysis of the Monte Carlo simulation, in order to obtain a detection capability for efficient, looking at the Compton inhibitor, as the CSF value increases with increase in the distance, more It was found that the background due to Compton continuum of the measured spectrum suppression mode Compton unrestrained mode can know that the Compton suppression many were made, using a $^{137}Cs$ is reduced.

Compton suppression 장치는 Compton 산란 반응을 이용하여, 스펙트럼의 Compton continuum 부분을 억제함으로써 Compton continuum 영역 내에서의 감마선 피크들의 분석을 보다 명확하게 할 수 있게 해주는 장치이다. 표층토양 시료에서 검출된 인공 방사능인 $^{137}Cs$과 자연 방사능인 $^{40}K$핵종의 방사능 농도 값들에 대한 방사능 계수치가 백그라운드를 상회하는 측정값이 발생되거나, 불필요한 방해피크나 비해석 대상 피크에 대하여 검출된 표준선원의 방사능 농도 값들의 실측치에 대한 background를 비억제 스펙트럼(Compton Unsuppression)과 억제 스펙트럼(Compton suppression)을 적용시켜 측정 에너지에 대한 교정을 알고자 점선원인 $^{137}Cs$을 거리별에 따라 측정하여, 몬테칼로 시뮬레이션과 비교 분석함으로서 효율적인 검출 능력을 얻고자 함이며, Compton 억제 인자를 보면 거리가 멀어짐에 따라 CSF 값이 클수록 더 많은 Compton suppression가 이루어졌음을 알 수 있고, $^{137}Cs$을 이용한 컴프턴 비억제 모드와 억제모드로 측정된 스펙트럼에서 컴프턴 연속에 의한 백그라운드가 감소함을 알 수 있었다.

Keywords

References

  1. Yonggu Im, "Uclear safety and security commission,", Uclear Safety And Security Commission, 1993.
  2. Nuclear safety and security commission, Environmental radioactivity monitoring work shop, 1996.
  3. National environmental radioactivity survey, KINS/AR-409,1997.
  4. Yangsuk Kim, "A Study on the measurement of Radioactivity in Soil and the Determination of relevand Gamma-ray Exposure Rete ", Major in Natural Science Education(physics), Graduate School of Education Chungnam National University Tacjon, korea, 1998.
  5. Sang kyu Hwang, "An analysis of gamma radioactive nuclide contained in soils in Bukbang Myeon Hongchon" Department of physis, Graduate School, Kangwon University, 2000.
  6. uclear Safety And Security Commission, "National environmental radioactivity survey report", 2011, 2012.
  7. uclear Safety And Security Commission, "National environmental radioactivity survey report", Pukyong National University Research Institute of Radiology, 2013.
  8. Salvat. F, Fernandez-Varea J.M, Sempau. J, "A code system for Monte Carlo simulation of electron and photon transport." in: Workshop Proceeding, Issy-les Moulineaux, France, Vol. 7, No. 10, 2003.
  9. Parus J, Kierzek J. Raab W, Donohue D, "A dual purpose Compton suppression spectrometer. Journal of Radioanalytical and Nuclear Chemistry", Vol. 258, No. 1, pp.123-132, 2003. https://doi.org/10.1023/A:1026270428392
  10. Helms H. A, "Low Level Counting/Compton Suppression" Harshaw Chemie B. V, De Meern, Holland,1996
  11. "Compton Suppression. Made Easy", Canberra Application Note, AN-D-8901.
  12. C.S. Park, G. M. Sun and H.D. Choi, "Performance of a Compton Suppression Spectrometer of the SNU-KAERI PGAA facility", J. Korean Nucl. Soc. Vol. 35, pp. 347, 2003.
  13. J. KIERZEK, J. PARUS, "Optimization of the Gamma Spectrometry System at SAL with the Use of Large NaI(Tl) Annulus in the Anticoincidence Mode for Compton Scattered Radiation Suppression" Report IAEA/AL/110, Seibersdorf, Austria, September 1997.
  14. L.L. Kiang et al. "A Study on T-shape Compton Suppression Spectrometer by Monte Carlo Simulation" Nuclear Instruments and Methods in Physics Research A, Vol. 327, p. 427, 1993. https://doi.org/10.1016/0168-9002(93)90708-P