Funct. Mater. 2021; 28 (4): 758-763

doi:https://doi.org/10.15407/fm28.04.758

Production of large-size polystyrene based plastic scintillators with uniform optical properties

A.Yu.Boyarintsev1, A.V.Kolesnikov1, S.N.Kovalchuk1, I.S.Nevliudov2

1Institute for Scintillation Materials, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
2Kharkiv National University of Radio Electronics, 14 Nauky Ave., 61166 Kharkiv, Ukraine

Abstract: 

The purpose of this work was to determine the nature of the appearance of striae in the volume of plastic scintillators obtained by bulk polymerization. A model was built and the calculation of the expected character of the convective flow of the styrene reaction mass at different widths of ampoules for block polymerization was carried out. The optimal size of the ampoule width for block polymerization was determined. A comparison of the characteristics of plastic scintillators with and without striae was made. For a scintillator without striae, the TAL is 10-25 % better. The minimum detecting activity under irradiation with an Am241 source is 2 times better than that of a scintillator with striae.

Keywords: 
plastic scintillator, striae, convection.

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