Plasma and Fusion Research

Volume 13, 2405011 (2018)

Regular Articles

Crystal Growth and Optical Properties of Organic Crystals for Neutron Scintillators
Akihiro YAMAJI1), Shunsuke KUROSAWA2,3), Yuji OHASHI1), Yuui YOKOTA2), Kei KAMADA2) and Akira YOSHIKAWA1,2)
1)
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
2)
New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
3)
Faculty of Science, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata 990-8560, Japan
(Received 31 July 2017 / Accepted 31 October 2017 / Published 26 February 2018)

Abstract

This paper presents the study of prospective organic-based materials, trans-stilbene and p-terphenyl, as their potential application for new neutron scintillators. Growth of their single crystals by the self-seeding vertical Bridgman method is reported. And evaluation of grown crystals concerning the composition, optical and luminescence properties, and scintillation performance at room temperature is discussed. Their photo- and radio-luminesce spectra were peaking at 388 and 408 nm, their quantum yield was of 52.4% and 79.7%, and the light yield were of 0.89 and 1.80 times higher than that of GS-20 standard, respectively. The scintillation decay times of 8.2 ns (trans-stilbene) and 5.8 ns (p-terphenyl) were observed as well.

Keywords

scintillation crystal, melt growth, organic scintillator, neutron scintillator, self-seeding vertical Bridgman method, optical property

DOI: 10.1585/pfr.13.2405011

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