Pulse pileup correction method for gamma-ray spectroscopy in high radiation fi elds

이민주; 이대희; 박경진; 김준혁; 고길영; Manish Sharma; 조규성

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자료유형: 학술저널

저자정보: 이민주 이대희 박경진 김준혁 고길영 Manish Sharma 조규성

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제5호

발행연도: 2020.1

수록면: 1,029 - 1,035 (7page)

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The detector suffers from pulse pileup by overlapping of the signals when it was used in high radiationfields. The pulse pileup deteriorates the energy spectrum and causes count losses due to random coincidences,which might not resolve within the resolving time of the detection system. In this study, it isaimed to propose a new pulse pileup correction method. The proposed method is to correct the startpoint of the pileup pulse. The parameters are obtained from the fitted exponential curve using the peakpoint of the previous pulse and the start point of the pileup pulse. The amplitude at the corrected startpoint of the pileup pulse can be estimated by the peak time of the pileup pulse. The system is composedof a NaI (Tl) scintillation crystal, a photomultiplier tube, and an oscilloscope. A 61 mCi 137Cs check-sourcewas placed at a distance of 3 cm, 5 cm, and 10 cm, respectively. The gamma energy spectra for theradioisotope of 137Cs were obtained to verify the proposed method. As a result, the correction of the pulsepileup through the proposed method shows a remarkable improvement of FWHM at 662 keV by 29, 39,and 7%, respectively.

참고문헌 (20)

참고문헌 신청

Shultis, K. John / 2007 / Fundamentals of Nuclear Science and Engineering / CRC Press

Daehee Lee / 2017 / A new cross-detection method for improved energy-resolving photon counting under pulse pile-up / Nucl. Instrum. Methods Phys. Res. A 867(21):154~162

D. Lee / 2017 / An innovative method to reduce count loss from pulse pile-up in a photon-counting pixel for high flux X-ray applications / J. Instrum 12:1~15

M. Vencelj / 2009 / Event by event pile-up compensation in digital timestamped calorimetry / Nucl. Instrum. Methods Phys. Res. A 607(3):581~586

Daehee Lee / 2017 / Energy-correction photon counting pixel for photon energy extraction under pulse pile-up / Nucl. Instrum. Methods Phys. Res. A 856(1):36~46

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