Effects of the photocathode non-uniformity on radon measurements by plastic scintillation spectrometry

This work shows a study of the effect of the non-uniformity of photocathode response on the energy resolution of plastic scintillators optimized for pulse-shape discrimination. The studies were performed with Hamamatsu R7600U-200 and R9779 photomultiplier tubes. The pulse-height and pulse-shape spec...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2022-08, Vol.331 (8), p.3249-3258
Main Authors: Todorov, Vladislav T., Dutsov, Chavdar Ch, Cassette, Philippe, Mitev, Krasimir K.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Energy resolution
Hadrons
Heavy Ions
Inorganic Chemistry
Nonuniformity
Normal distribution
Nuclear Chemistry
Nuclear Physics
Photocathodes
Photomultiplier tubes
Physical Chemistry
Radon
Scintillation
Scintillation counters
Spectra
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Summary:This work shows a study of the effect of the non-uniformity of photocathode response on the energy resolution of plastic scintillators optimized for pulse-shape discrimination. The studies were performed with Hamamatsu R7600U-200 and R9779 photomultiplier tubes. The pulse-height and pulse-shape spectra were obtained for a small piece of radon-222 loaded plastic scintillator positioned at different places on the photocathode. We show that alpha spectra can be approximated well with a normal distribution if the non-uniformity of the photon response of the photocathode is minimized. In the cases when the non-uniformity cannot be minimized, we propose an analytical function which describes the shape of the alpha peaks well under a variety of conditions. A possible effect of the non-uniformity of the photocathode response on the primary activity measurements by liquid scintillation counting is highlighted.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-022-08362-6