Title: New method to eliminate single photon in liquid scintillation counting
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 <sup>14</sup>C were discriminated at a fall time threshold of 6ns above the ADC sampling frequency of 500MHz.
Publication Year: 2022
Publication Date: 2022-03-27
Language: en
Type: article
Indexed In: ['crossref']
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