Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (3): 67 doi: 10.1007/s41365-016-0063-0

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Ballistic deficit compensation method for a large-volume HPGe detector at high count rates

Chuan-Yun Xiong 1,2  Ming-Zhe Liu 1,2  Zhuo Zuo 1,2  Xian-Guo Tuo 1   

  1. 1 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
    2 College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China
  • Contact: Ming-Zhe Liu E-mail:liumz@cdut.edu.cn
  • Supported by:

    This work was supported by Natural Science Foundation of China (No. 41274109) and Youth Innovation Team of Sichuan Province (2015TD0020).

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Chuan-Yun Xiong, Ming-Zhe Liu, Zhuo Zuo, Xian-Guo Tuo. Ballistic deficit compensation method for a large-volume HPGe detector at high count rates.Nuclear Science and Techniques, 2016, 27(3): 67     doi: 10.1007/s41365-016-0063-0
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Abstract:

A large-volume HPGe detector normally has a severe ballistic deficit due to its long rise time of the output signals. Despite the trapezoidal shaping algorithm adopted as a remedy to deal with the signals, the algorithm cannot fully eliminate the ballistic deficit in the case of a high counting rate. To resolve the problem, we propose a ballistic deficit compensation method that is based on the measurement of rise time of the signals before shaping. We find that the ballistic deficit after trapezoidal shaping has little relation to the time constant, but shows a quadratic relationship with the rise time and has a negative correlation with the shaping time. In the case of high count rates, the high resolution is handled by fitting the curve to the rise time and the amplitude deficit of the signal after shaping and by compensating for the signal amplitude after trapezoidal shaping. Tests indicate that when the count rate is about 100 kcps, the resolution of Co-60 improves from traditional 2.32 up to 1.91 keV, thus reaching a higher level.

Key words: HPGe detector, Ballistic deficit, Trapezoidal shaping algorithm, Rise time measurement, Amplitude compensation