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Journal Articles

Effects of gamma-rays on polymethylmethacrylate plastic optical fiber under low dose-rate irradiation

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko

Proceedings of 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference (2011 NSS/MIC) (DVD-ROM), p.347 - 349, 2011/00

An irradiation test was performed for polymethylmethacrylate (PMMA) plastic optical fibers (POFs) under low dose-rate gamma-ray irradiation in order to use the fiber in low-level radiation environments. Radiation-induced loss that has peaks in the ultraviolet and near infrared wavelength range and improvement in the optical transmission over an entire wavelength range were observed under the irradiation. The peak intensity of the induced loss increases with the absorbed dose, and the intensity saturate at some absorbed doses. The absorbed dose at which the intensity becomes saturated depends on the gamma-ray dose rate. Therefore, it is necessary to take into account the dose rate when the PMMA POF used as a dosimeter in low level gamma-ray irradiation. The improvement in the optical transmission is dependent on the radiation dose rate and become large in lower gamma-ray dose rate.

Journal Articles

Feasibility study on visualization of transient phenomena using high resolution on-line neutron imaging system at J-PARC

Segawa, Mariko; Kai, Tetsuya; Oi, Motoki; Takamine, Jun; Kureta, Masatoshi

Proceedings of 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference (2011 NSS/MIC) (DVD-ROM), p.385 - 392, 2011/00

Journal Articles

Development of wavelength-shifting-fiber neutron image detector with a fiber-optic taper with a high spatial resolution

Nakamura, Tatsuya; Yasuda, Ryo; Katagiri, Masaki*; To, Kentaro; Sakasai, Kaoru; Birumachi, Atsushi; Ebine, Masumi; Soyama, Kazuhiko

Proceedings of 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2011), Vol.1, p.382 - 384, 2011/00

The neutron image detector that was based on wavelength-shifting-fibers (WLS fibres) equipped with the fibre optic taper (FOT) was developed. By inserting the FOT in between the scintillator and WLS fibers the measured neutron image was magnified on the WLS fibres, resulting in better spatial resolution. We have tested two FOTs; a square shaped one in a size of 2.6 $$times$$ 2.6 mm and a round shaped with a diameter of 20 mm. Both FOTs have identical magnification ratios of 3.1. By implementing the larger FOT the detector has the neutron-sensitive area of 314 mm$$^{2}$$ with the effective pixel size of 0.17 $$times$$ 0.17 mm$$^{2}$$ whilst the light transmission rate decreased 20% less compared to that with the small FOT. The detector equipped with the larger FOT exhibited a spatial resolution of 0.26 $$pm$$ 0.07 mm, which was similar to the one with the small FOT.

Oral presentation

Substantiative experiments of distortion correction for novel Si/CdTe Compton camera

Kawachi, Naoki; Yamaguchi, Mitsutaka; Nagao, Yuto; Suzui, Nobuo; Fujimaki, Shu; Kamiya, Tomihiro; Odaka, Hirokazu*; Kokubun, Motohide*; Takeda, Shinichiro*; Ishikawa, Shinnosuke*; et al.

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