Digital pulse deconvolution method for current tails of NaI(Tl) detectors

Guo-Qiang Zeng; Jian Yang; Ming-Fu Yu; Kai-Qi Zhang; Qing Ge; Liang-Quan Ge

doi:10.1088/1674-1137/41/1/016102

Chinese Physics C> 2017, Vol. 41> Issue(1) : 016102 DOI: 10.1088/1674-1137/41/1/016102

Digital pulse deconvolution method for current tails of NaI(Tl) detectors

1.
Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan, Chengdu University of Technology, Chengdu 610059, China

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Abstract：
To overcome the problem of pulse pile-up at high count rates, a digital deconvolution algorithm is used to remove the exponential current tails of NaI(Tl) detectors, so as to obtain a current unit impulse. Then a narrow pulse can be obtained through pulse shaping. The pulse deconvolution technique can thoroughly eliminate the influences of ballistic deficit and improve traditional pulse shaping systems in both pulse throughput and energy resolution. To demonstrate this method, the energy spectrum of a ¹³⁷Cs radioactive source was measured. When the shaping time constant is 1.5μs, traditional pulse shaping systems yielded a 6.99% energy resolution and 68 kcps count rate, while the new pulse deconvolution technique, used to improve traditional pulse shaping systems, yielded a 6.37% energy resolution and 102 kcps count rate.
- deconvolution ,
- pulse shaping ,
- digital pulse processing ,
- decay time ,
- ballistic deficit

References

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Guo-Qiang Zeng, Jian Yang, Ming-Fu Yu, Kai-Qi Zhang, Qing Ge and Liang-Quan Ge. Digital pulse deconvolution method for current tails of NaI(Tl) detectors[J]. Chinese Physics C, 2017, 41(1): 016102. doi: 10.1088/1674-1137/41/1/016102

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Received: 2016-09-03

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Supported by National Natural Science Foundation of China (41474159), Sichuan Youth Science Technology Foundation (2015JQ0035) and Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan (gnzds2014006)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Digital pulse deconvolution method for current tails of NaI(Tl) detectors

Corresponding author: Guo-Qiang Zeng,

Corresponding author: Jian Yang,

1. Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2016-09-03

Available Online: 2017-01-05

Fund Project: Supported by National Natural Science Foundation of China (41474159), Sichuan Youth Science Technology Foundation (2015JQ0035) and Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan (gnzds2014006)

Abstract: To overcome the problem of pulse pile-up at high count rates, a digital deconvolution algorithm is used to remove the exponential current tails of NaI(Tl) detectors, so as to obtain a current unit impulse. Then a narrow pulse can be obtained through pulse shaping. The pulse deconvolution technique can thoroughly eliminate the influences of ballistic deficit and improve traditional pulse shaping systems in both pulse throughput and energy resolution. To demonstrate this method, the energy spectrum of a ¹³⁷Cs radioactive source was measured. When the shaping time constant is 1.5μs, traditional pulse shaping systems yielded a 6.99% energy resolution and 68 kcps count rate, while the new pulse deconvolution technique, used to improve traditional pulse shaping systems, yielded a 6.37% energy resolution and 102 kcps count rate.

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Digital pulse deconvolution method for current tails of NaI(Tl) detectors

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