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Detection of voluminous gamma-ray source with a collimation beam geometry and comparison with peak efficiency calculations of EXVol

  • Kang, M.Y. (Seoul National University) ;
  • Sun, G.M. (Korea Atomic Energy Research Institute) ;
  • Choi, H.D. (Seoul National University)
  • Received : 2020.04.18
  • Accepted : 2020.05.06
  • Published : 2020.11.25

Abstract

In this study, we expanded the performance of the existing EXVol code and performed empirical experiments and calculations. A high-resolution gamma spectroscopy system was constructed, and a standard point source and a standard volume source were measured with an HPGe detector with 43.1% relative efficiency. EXVol was verified by quantitative comparison of the detection efficiencies determined by measurements and calculations. To introduce the concept of the detector scanning that occurs in the actual measurement into the EXVol code, a collimator was placed between the source and detector. The detection efficiency was determined in the asymmetric arrangement of the source and detector with a collimator. A collimator made of lead with a diameter of 15 mm and a thickness of 50 mm was installed between the source and the detector to determine the detection efficiency at a specific location. The calculation result was contour plotted so that the distribution of detection efficiency could be visually confirmed. The relative deviation between the measurements and calculations for the coaxial and asymmetric structures was 10%, and that for the collimation structure was 20%. The results of this study can be applied to research using γ-ray measurements.

Keywords

References

  1. Jose Rodenas, Antonio Martinavarro, Vicente Rius, Validation of the MCNP code for the simulation of Ge-detector calibration, Nucl. Instrum. Methods Phys. Res. 450 (2000) 88-97. https://doi.org/10.1016/S0168-9002(00)00253-9
  2. O. Sima, D. Arnold, C. Dovlete, GESPECOR: a versatile tool in gamma-ray spectrometry, J. Radioanal. Nucl. 248 (2001) 359-364. https://doi.org/10.1023/A:1010619806898
  3. M.Y. Kang, G.M. Sun, Junhyuck Kim, H.D. Choi, Determination of HPGe peak efficiency for voluminous gamma-ray sources by using an effective solid angle method, Appl. Radiat. Isot. 116 (2016) 69-76. https://doi.org/10.1016/j.apradiso.2016.07.015
  4. L. Moens, J. De Donder, Xi-lei Lin, F. De Corte, A. De Wiselaere, A. Simonits, J. Hoste, Calculation of the absolute peak efficiency of gamma-ray detectors for different counting geometries, Nucl. Instrum. Methods Phys. Res. 187 (1981) 451-472. https://doi.org/10.1016/0029-554X(81)90374-8
  5. Tien-ko Wang, Wei-yang Mar, Tzung-hua Ying, Chia-lian Tseng, Chihung Liao, Mei-ya Wang, HPGe detector efficiency calibration for extended cylinder and marinelli-beaker sources using the ESOLAN program, Appl. Radiat. Isot. 48 (1997) 83-95. https://doi.org/10.1016/S0969-8043(96)00062-0
  6. M. Bruggeman, R. Carchon, Solidang, a computer code for the computation of the effective solid angle and correction factors for gamma spectroscopy-based waste assay, Appl. Radiat. Isot. 52 (2000) 771-776. https://doi.org/10.1016/S0969-8043(99)00243-2
  7. Maurice Miller, Mitko Voutchkov, Modeling the impact of uncertainty in detector specification on efficiency values of a HPGe detector using ANGLE software, Nucl. Technol. Radiat. 28 (2013) 169-181. https://doi.org/10.2298/NTRP1302169M
  8. K. Abbas, F. Simonelli, F. D'Alberti, M. Forte, M.F. Stroosnijder, Reliability of two calculation codes for efficiency calibrations of HPGe detectros, Appl. Radiat. Isot. 56 (2002) 703-709. https://doi.org/10.1016/S0969-8043(01)00269-X
  9. L. Moens, F. De Corte, A. Simonits, Xilei Lin, A. De Wiselaere, J. De Donder, J. Hoste, Calculation of the absolute peak efficiency of Ge and Ge(Li) detectors for different counting geometries, J. Radioanl. Nucl. Chem. 70 (1982) 539-550. https://doi.org/10.1007/BF02516136
  10. C.S. Park, H.D. Choi, G.M. Sun, J.H. Whang, Status of developing HPGe ${\gamma}$-ray spectrum analysis code HYPERGAM, Prog. Nucl. Energy 50 (2008) 389-393. https://doi.org/10.1016/j.pnucene.2007.11.022