Development of the ZnS(Ag)/BC-408 phoswich detector for monitoring radioactive contamination inside pipes

배관 내부 방사능 오염도 측정용 ZnS(Ag)/BC-408 phoswich 검출기 개발

  • Published : 2006.09.30

Abstract

A small radiation detection system is necessary for the direct characterization of alpha/beta-ray contamination inside pipes generated during the decommission of a nuclear facility. In this work, the new type phoswich detector consisting of the ZnS(Ag) and plastic scintillator for ${\alpha}/{\beta}$ simultaneous counting was designed as part of a development of a equipment capable of monitoring radiological contamination inside pipes. The optimum counting conditions in dimensions of scintillator and a detection system were experimentally confirmed and a performance of alpha/beta-ray discrimination was evaluated. As a result, optimum conditions of a detector suitable for monitoring radiological contamination inside pipes and a feasibility of application to pipe-inside were confirmed.

References

  1. U.S. Department of Energy. Pipe Explorer $^{TM}$ Surveying System; INNOVATIVE TECHNOLOGY Summary Report, DOE/EM-0440. 1999
  2. U.S. Department of Energy. Pipe $Crawler{\circledR}$ Internal Piping Characterization System; INNOVATIVE TECHNOLOGY Summary Report, DOE/EM -0355. 1998
  3. Overman RT, Clark HM. Radioisotope Techniques. New York; McGraw-Hill, 1960
  4. Chase GD, Rabinowitz JL. Principles of Radioisotope Methodology. Minneapolis; Burgess Publishing Company, 1967
  5. ASTM; American Society for Testing and Materials, Standard Test Methods for Detector Calibration and Analysis of Radionuclides. ASTM E181-98, 2003:16
  6. Kriss AA and Hamby DM. Beta spectroscopy with a large-area avalanche photodiode module and plastic scintillator. Nucl. Instr. Meth. A. 2004 Feb;525:553-559 https://doi.org/10.1016/j.nima.2004.02.016
  7. Miramonti L. A plastic scintillator detector for beta particles. Radi. Meas. 2002 Aug;35:347-354 https://doi.org/10.1016/S1350-4487(02)00051-3
  8. Tarancon A, Garcia JF and Rauret G. Mixed waste reduction in radioactivity determination by using plastic scintillators. Anal. Chim. Acta. 2002 Jul;463:125-134 https://doi.org/10.1016/S0003-2670(02)00352-5
  9. Thorngate JH and El-Razek MMA. Limits to the applicability of commonly used pulse-¬shape figures of merit and possible alternative measures of performance. Nucl. Instr. Meth. 1977 Jul;144:209-214 https://doi.org/10.1016/0029-554X(77)90110-0
  10. Winyad RA, Lutkin JE and McBeth GW. Pulse shape discrimination in inorganic and organic scintillators. I. Nucl. Instr. Meth. 1971 Aug;95:141-153 https://doi.org/10.1016/0029-554X(71)90054-1