New method to eliminate single photon in liquid scintillation counting

Ziyang Wei; Deyuan Li; Yan Ma; Xiaodong Zhang; Xiongxin Dai

doi:10.1117/12.2625189

27 March 2022 New method to eliminate single photon in liquid scintillation counting

Ziyang Wei, Deyuan Li, Yan Ma, Xiaodong Zhang, Xiongxin Dai

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121698W (2022) https://doi.org/10.1117/12.2625189
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Liquid Scintillation Counting (LSC) is widely used in measurement of α- and β-emitting. Single photons generated by chemiluminescence affects the accuracy in low-energy β activity measurement. A novel method based on the fall time analysis of Photomultiplier Tube(PMT) output signals was developed to discriminate the single photons. A liquid scintillation measuring system made of a Hamamatsu R9420 Photomultiplier Tube and a Paul Scherrer Institut (PSI) digitizer was used to collect the light emitting from the cocktails. Ultima Gold liquid scintillation cocktails with different concentration of 14C standard solution were measured to verify the feasibility of the method. Effects of the Analog-to-Digital Converter (ADC) sampling frequency on the discrimination of single photons were analyzed. The results show that the signals of single photons and low-energy β emitted from ¹⁴C were discriminated at a fall time threshold of 6ns above the ADC sampling frequency of 500MHz.

Citation Download Citation

Ziyang Wei, Deyuan Li, Yan Ma, Xiaodong Zhang, and Xiongxin Dai "New method to eliminate single photon in liquid scintillation counting", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121698W (27 March 2022); https://doi.org/10.1117/12.2625189

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