title: Optimized mounting of a polyethylene naphthalate scintillation material in a radiation detector.
abstract: Polyethylene naphthalate (PEN) has great potential as a scintillation material for radiation detection. Here the optimum mounting conditions to maximize the light collection efficiency from PEN in a radiation detector are discussed. To this end, we have determined light yields emitted from irradiated PEN for various optical couplings between the substrate and the photodetector, and for various substrate surface treatments. The results demonstrate that light extraction from PEN is more sensitive to the optical couplings due to its high refractive index. We also assessed the extent of radioactive impurities in PEN as background sources and found that the impurities are equivalent to the environmental background level.
authors.affiliation: Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan. hidehito@rri.kyoto-u.ac.jp
authors.forename: Hidehito
authors.initials: H
authors.lastname: Nakamura
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Yamada
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Shirakawa
authors.forename: Hisashi
authors.initials: H
authors.lastname: Kitamura
authors.forename: Zenichiro
authors.initials: Z
authors.lastname: Shidara
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yokozuka
authors.forename: Philip
authors.initials: P
authors.lastname: Nguyen
authors.forename: Masaya
authors.initials: M
authors.lastname: Kanayama
authors.forename: Sentaro
authors.initials: S
authors.lastname: Takahashi
keywords: Light yield; Mounting condition; Polyethylene naphthalate; Radioactive impurity; Refractive index