Trapezoidal pulse shaping for pile-up pulse identification in X-ray spectrometry

ZHOU Jian-Bin; LIU Yi; HONG Xu; ZHOU Jin; MA Ying-Jie; WANG Min; HU Yun-Chuan; CHEN Bao; YUE Ai-Zhong

doi:10.1088/1674-1137/39/6/068201

Chinese Physics C> 2015, Vol. 39> Issue(6) : 068201 DOI: 10.1088/1674-1137/39/6/068201

Trapezoidal pulse shaping for pile-up pulse identification in X-ray spectrometry

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Abstract：
Energy resolution is affected by the intrinsic energy resolution of the detector, ballistic deficit, pile-up pulses and noise. Pile-up pulses become the dominant factor that degrades energy resolution after the system is established, so pile-up rejection is often applied to obtain good energy resolution by discarding pulses that are expected to be contaminated by pile-up. However, pile-up rejection can reduce count rates and thus lower the measurement precision. In order to improve count rates and maintain energy resolution, a new method of pile-up pulse identification based on trapezoidal pulse shaping is presented. Combined with pulse width discrimination, this method is implemented by recording pulses that are not seriously piled up. Some experimental tests with a Cu-Pb alloy sample are carried out to verify the performance of this method in X-ray spectrometry. The results show that the method can significantly improve count rates without degrading energy resolution.

References

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ZHOU Jian-Bin, LIU Yi, HONG Xu, ZHOU Jin, MA Ying-Jie, WANG Min, HU Yun-Chuan, CHEN Bao and YUE Ai-Zhong. Trapezoidal pulse shaping for pile-up pulse identification in X-ray spectrometry[J]. Chinese Physics C, 2015, 39(6): 068201. doi: 10.1088/1674-1137/39/6/068201

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Received: 2014-09-28
Revised: 2014-12-19

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Trapezoidal pulse shaping for pile-up pulse identification in X-ray spectrometry

Corresponding author: LIU Yi,

Received Date: 2014-09-28

Accepted Date: 2014-12-19

Available Online: 2015-06-05

Abstract: Energy resolution is affected by the intrinsic energy resolution of the detector, ballistic deficit, pile-up pulses and noise. Pile-up pulses become the dominant factor that degrades energy resolution after the system is established, so pile-up rejection is often applied to obtain good energy resolution by discarding pulses that are expected to be contaminated by pile-up. However, pile-up rejection can reduce count rates and thus lower the measurement precision. In order to improve count rates and maintain energy resolution, a new method of pile-up pulse identification based on trapezoidal pulse shaping is presented. Combined with pulse width discrimination, this method is implemented by recording pulses that are not seriously piled up. Some experimental tests with a Cu-Pb alloy sample are carried out to verify the performance of this method in X-ray spectrometry. The results show that the method can significantly improve count rates without degrading energy resolution.

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Trapezoidal pulse shaping for pile-up pulse identification in X-ray spectrometry

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