External exposure dose estimation by electron spin resonance technique for wild Japanese macaque captured in Fukushima Prefecture

Oka, Toshitaka; Takahashi, Atsushi*; Koarai, Kazuma; Mitsuyasu, Yusuke*; Kino, Yasushi*; Sekine, Tsutomu*; Shimizu, Yoshinaka*; Chiba, Mirei*; Suzuki, Toshihiko*; Osaka, Ken*; et al.

Radiation Measurements, 134, p.106315_1 - 106315_4, 2020/06

https://doi.org/10.1016/j.radmeas.2020.106315

The relationship between the CO radical intensity and the absorbed dose (dose response curve) of tooth enamel of Japanese macaque was observed by electron spin resonance and the detection limit of our system was estimated to be 33.5 mGy, which is comparable to the detection limit for human molar teeth. Using the dose response curve, external exposure dose for seven wild Japanese macaques captured in Fukushima prefecture were examined. The results suggest that the external exposure dose for the wild Japanese macaques were ranged between 45 mGy to 300 mGy.

Applications of He neutron spin filters on the small-angle neutron scattering spectrometer SANS-J-II

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Aizawa, Kazuya; Arai, Masatoshi; Noda, Yohei; et al.

Journal of Physics; Conference Series, 294(1), p.012017_1 - 012017_7, 2011/06

https://doi.org/10.1088/1742-6596/294/1/012017

Structure of glasses for He neutron spin filter cells

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.

Journal of Physics; Conference Series, 294(1), p.012004_1 - 012004_7, 2011/06

https://doi.org/10.1088/1742-6596/294/1/012004

Research on glass cells for He neutron spin filters

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.

Physica B; Condensed Matter, 406(12), p.2443 - 2447, 2011/06

https://doi.org/10.1016/j.physb.2010.12.020

Visit report; Analytical Sciences group, Institute of life sciences innovation, AJINOMOTO Co., Inc.

Endo, Masatoshi*; Surugaya, Naoki

Bunseki, 2011(4), p.231 - 233, 2011/04

http://www.jsac.or.jp/bunseki/pdf/bunseki2011/201104konnichiwa.pdf

This article describes a visit report of the Institute of life sciences innovation Analytical sciences group in AJINOMOTO Co., Inc. We report on a trend of the research and development and the latest information about the analystical chemistry in the research institute. This article is published in the bulletin of the Japan Society for Analytical Chemistry "BUNSEKI".

Measurement of the radioactive concentration in consumer's goods containing natural uranium and thorium and evaluation of the exposure by their utilization

Yoshida, Masahiro*; Endo, Akira; Sato, Shigero*; Ohata, Tsutomu*; Watanabe, Masatoshi*; Oyama, Ryutaro*; Furuya, Hirotaka*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 4(3), p.213 - 218, 2005/09

https://doi.org/10.3327/taesj2002.4.213

no abstracts in English

Development and application of an in-situ SEOP He neutron spin filter at J-PARC/MLF

Oku, Takayuki; Kira, Hiroshi*; Hayashida, Hirotoshi; Sakai, Kenji; Shinohara, Takenao; Sakaguchi, Yoshifumi*; Ino, Takashi*; Arimoto, Yasushi*; Oyama, Kenji*; Hiraka, Haruhiro*; et al.

no journal, , 

The He based neutron polarizer is useful in experiments such as polarized neutron scattering experiments in a wide q-range, etc., since it is effective for neutrons in a wide energy range. To introduce the in-situ SEOP polarized He neutron spin filter into the instruments of the pulsed neutron facility such as J-PARC/MLF, it is important to make the system compact and stable, because the system is located inside thick and bulky radiation shields for high energy ray and neutrons. In this study, we have developed a compact laser optics with a volume holographic grating element, and composed an in-situ SEOP He neutron spin filter. We have started to apply the He spin filer as an analyzer to polarized neutron small angle scattering and reflection measurements. In this paper, we report the design of our SEOP He neutron spin filter system and some results of the related polarized neutron beam experiments.

Current status and perspectives in the development of an in-situ spin-exchange optical pumping He neutron spin filter at J-PARC

Oku, Takayuki; Kira, Hiroshi*; Hayashida, Hirotoshi*; Sakai, Kenji; Hiroi, Kosuke; Shinohara, Takenao; Sakaguchi, Yoshifumi*; Ino, Takashi*; Oyama, Kenji*; Nakamura, Mitsutaka; et al.

no journal, , 

We have been developing a He neutron spin filter (NSF) for the efficient utilization of pulsed neutrons, since it can polarize neutrons effectively in a wide energy range. The He NSF is effective even for neutrons with energy higher than several-tens-meV, so that it will be useful for the study of high-energy magnetic excitation. Since the He NSF can also cover a large solid angle and polarize neutrons without deflecting them from their original course, it is suitable for the analyzer for SANS instruments and reflectometers. In addition, the He NSF will be a key device in the application of recently developed magnetic field imaging technique by using polarized pulsed neutrons. In order to apply the He NSF to such experiments at a pulsed neutron experimental facility such as the J-PARC, we have developed compact laser optics with a volume holographic grating (VHG) element for a spin-exchange optical pumping (SEOP) system, and composed an in-situ SEOP He NSF. Current status in the development and application of the in-situ SEOP He NSF at J-PARC will be presented, and perspectives will be discussed.

Influence on the oxidative stress status in liver and bladder of wild Japanese macaques in response to radiation exposure in the ex-evacuation zone of the Fukushima Daiichi Nuclear Power Plant accident

Ishikawa, Ryoya*; Suzuki, Masatoshi*; Kino, Yasushi*; Endo, Satoru*; Nakajima, Hiroo*; Oka, Toshitaka; Takahashi, Atsushi*; Shimizu, Yoshinaka*; Suzuki, Toshihiko*; Shinoda, Hisashi*; et al.

no journal, , 

In order to investigate the influence on the oxidative stress status by the long-term exposure after the Fukushima Daiichi Nuclear power plant (FNPP) accident, we analyzed oxidative stress markers in liver and bladder of wild Japanese macaques in the ex-evacuation zone. In liver, the concentration of malondialdehyde (MDA) in approximately 70% of the exposed group exceeded the average and SOD activity of the exposed group shifted toward lower within the range indicated in the control group. By contrast, alteration of MDA concentration and SOD activity in bladder was opposite to that shown in liver. We also found that oxidative stress markers changed in the same manner by external and internal exposure. Our data suggested that exposure to low dose/low dose-rate radiation following the FNPP accident may affect the sensitivity to oxidative stress by changing the activity of antioxidant enzymes.

Development of polarized He neutron spin filters, 3

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu; Wakimoto, Shuichi; et al.

no journal, , 

Polarized neutron scattering is a powerful technique in order to clarify the magnetic structure of materials. The technique is often used in JRR-3 nowadays. However, the available energy has been limited below 100 meV as long as we use the conventional polarizing method. To realize polarized neutron scattering experiments above the energy, the use of He spin filters is the best solution. In addition, in the new pulsed neutron facility, J-PARC, the neutron source has wide energy spectrum. To polarize all the neutrons, it is desired to use the He spin filters. Taking these backgrounds into account, we are now planning to introduce He neutron spin filters to polarized neutron experiments at JRR-3 and J-PARC. In our oral presentation, we report the detailed plan of the experiments and the present status of the preparation.