Flexible composite scintillators based on ZnWO4 micro- and nanopowders

V. Tinkova; A. Yakubovskaya; I. Tupitsyna; S. Abashin; A. Puzan; S. Tretyak

doi:10.15222/TKEA2019.1-2.40

V. Tinkova Institute for Scintillation Materials NAS of Ukraine, Kharkiv, Ukraine
A. Yakubovskaya Institute for Scintillation Materials NAS of Ukraine, Kharkiv, Ukraine
I. Tupitsyna Institute for Scintillation Materials NAS of Ukraine, Kharkiv, Ukraine
S. Abashin National Aerospace University “Kharkiv Aviation Institute”, Kharkiv, Ukraine
A. Puzan SSI “Institute for Single Crystals” NAS of Ukraine, Kharkiv, Ukraine
S. Tretyak Institute for Scintillation Materials NAS of Ukraine, Kharkiv, Ukraine

DOI: https://doi.org/10.15222/TKEA2019.1-2.40

Keywords: zinc tungstate, nano-sized crystals, micro-sized powders, composite scintillators, light output, afterglow

Abstract

Nano-sized and micro-sized ZnWO₄ powders were obtained by different methods: hydrothermal synthesis with microwave heating, molten salt method, solid-state synthesis and сrushing of bulk crystals. Their morphological features were studied using transmission electron microscope and scanning electron microscope. The obtained nano- and micro-sized powders were used as fillers for flexible composite scintillators. The silicon rubber was used as a binder. The luminescent characteristics and scintillation performance of composite scintillators were measured. The dependence of scintillation performance of flexible scintillators on the morphological features of ZnWO₄ nanocrystallites was demonstrated. The flexible composite scintillator based on zinc tungstate obtained by solid-state synthesis with lithium nitrate addition was obtained and investigated. Its scintillation performance was close to that of a ZnWO₄ single crystal.

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