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Experimental and Simulated Efficiency of a HPGe Detector in the Energy Range of $0.06{\\sim}11$ MeV

Journal of the Korean Nuclear Society = 원자력학회지, v.35 no.3, 2003년, pp.234 - 242  

Park Chang Su (Seoul National University) ,  Sun Gwang Min (Seoul National University) ,  Choi H.D. (Seoul National University)

Abstract AI-Helper 아이콘AI-Helper

The full energy peak efficiency of a hyper pure germanium (HPGe) detector was calibrated in a wide energy range from 0.06 to 11 MeV. Both the experimental technique and the Monte Carlo method were used for the efficiency calibration. The measurement was performed using the standard radioisotopes in ...

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제안 방법

  • 1 was written based on the particle transport functions of GEANT. Among the distributed example routines, the optimum one was chosen and modified to include the experimental conditions in this study.
  • 1. First, the efficiency was calculated for the single mode detection before the upgrade in order to tune the geometric parameters of the HPGe detector. The calculated result using the detector geometry supplied by the manufacturer agreed with the measurement in the relative trend of efficiency.
  • This res니It is expected to contribute to improving the accuracy of the efficiency calculation using Monte Carlo method, identifying the sensitive tuning parameters, and understanding the efficiency trend dependent on the y-ray energy. The result will also be a supporting frame for a further calibration study on single and double escape peak efficiencies, which have severer limits on the energy range and the number of data points in the experimental approach. In addition to the absolute efficiency calibration, the physical origin of the characteristic local minimum near 600 keV on the efficiency curve was analyzed.

대상 데이터

  • The n-type HPGe detector in this study is being used in the SNU-KAERI PGAA facility. The /-ray spectroscopy system was initially a single mode system 냐sing a HPGe detector[8], and has recently been upgraded to a multi-mode system, which includes single, Compton suppression and pair modes[9).

이론/모형

  • The calculated efficiency was compared with the measurement. GEANT was chosen as the Monte Carlo code due to its poworhjlness and popularity in simulating the response of a HPGe detector. In addition to the efficiency calculation, the origin of the local minimum near 600 keV on the efficiency curve was explained.
  • In this study, GEANT[12] was chosen for the Monte Carlo simulation code. The GEANT was developed in CERN as a particle transport code and is widely used for simulating the response of a HPGe detector in parall기 with the MCNP and EGS4 codes!1347].
  • In this study, the efficiency of a HPGe detector was calc니lated using the Monte Carlo method for the y-ray spectroscopy system of the SNU-KAERI Prompt Gamma Activation Analysis(PGAA) facility⑻ at HANARO, a research reactor of the Korea Atomic Energy Research Instit나to. The calculation was performed in the wide energy range of 0.
  • The efficiency of a detector is essentially req니ired to determine the radioactivity of an imkmown nuclide, and is also important as the fundamental characteristics of a detector) 1]. The efficiency calibration is mostly performed by the experimental technique with a check by the Monte Carlo simulation method.
  • The efficiency curve of the HPGe detector was measured and calculated using the Monte Carlo method in a wide energy range of 0.06 - 11 MeV. The measurement was performed by the SNU-KAERI PGAA detector upgraded recently to multi-mode spectrometer and the Monte Carlo calculation was done using the GEANT code.
  • 06 - 11 MeV. The measurement was performed by the SNU-KAERI PGAA detector upgraded recently to multi-mode spectrometer and the Monte Carlo calculation was done using the GEANT code. The calculated and the measured efficiencies agreed with each other within 7% in the whole energy range.
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참고문헌 (25)

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  3. S. Raman, C. Yonezawa, H. Matsue, H. Iimura and N. Shinohara, 'Efficiency calibration of a Ge detector in the 0.1-11.0 MeV region', Nucl. Instr. and Meth. A 454, 389 (2000) 

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  9. G.M. Sun, C.S. Park and H.D. Choi, 'lmprovement of the Gamma-ray Spectrometer of SNU-KAERI PGAA FaciIity', Proceedings of the Korean Nuclear Society Autumn Meeting, Yongpyong, Korea, (2002) (in Korean) 

  10. R.B. Firestone, Lawrence Berkeley National Laboratory, USA, private communication 

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  15. M. Korun and T. Vidmar, 'Monte Carlo calculations of the total-to-peak ratio in gamma-ray spectrometry', Appl. Radiat. Isot. 52, 785 (2000) 

  16. J.-M. Laborie, G.Le Petit, D. Abt and M. Girard, 'Monte Carlo calculation of the efficiency calibration curve and coincidence-summing corrections in low-level gamma-ray spectrometry using well-type HPGe detectors', Appl. Radiat. Isot. 53, 57 (2000) 

  17. D. Karamanis, V. Lacoste, S. Andriamonje, G. Barreau and M. Petit, 'Experimental and simulated efficiency of a HPGe detector with point-like and extended sources', Nucl. Instr. and Meth. A 487, 477 (2002) 

  18. C.S. Kim, G.M. Sun, J.Y. Lee, S.H. Byun, M.S. Kim, Y.D. Bae and H.D. Choi, 'Measurement of the HPGe Detector Efficiencies for $gamma$ -rays and a Comparison with Monte Carlo Calculations', Sae Mulli 37, 399 (1997) (in Korean) 

  19. C.S. Park, G.M. Sun, S.H. Byun and H.D. Choi, 'Calculation of Efficiency for HPGe Detector by Using GEANT', Proceedings of the Korean Nuclear Society Autumn Meeting, Yongpyong, Korea, (2002) (in Korean) 

  20. S. Kamboj and B. Kahn, 'Evaluation of Monte Carlo simulation of photon counting efficiency for germanium detectors', Health Phys. 70, 512 (1996) 

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