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Journal Articles

Real-time ${{it in vivo}}$ dosimetry system based on an optical fiber-coupled microsized photostimulable phosphor for stereotactic body radiation therapy

Yada, Ryuichi*; Maenaka, Kazusuke*; Miyamoto, Shuji*; Okada, Go*; Sasakura, Aki*; Ashida, Motoi*; Adachi, Masashi*; Sato, Tatsuhiko; Wang, T.*; Akasaka, Hiroaki*; et al.

Medical Physics, 47(10), p.5235 - 5249, 2020/10

 Times Cited Count:4 Percentile:75.79(Radiology, Nuclear Medicine & Medical Imaging)

The ${{it in vivo}}$ dosimeter system is capable of real-time, accurate, and precise measurement under stereotactic body radiation therapy (SBRT) conditions. The probe is smaller than a conventional dosimeter, has excellent spatial resolution, and can be valuable in SBRT with a steep dose distribution over a small field. The developed PSP dosimeter system appears to be suitable for in vivo SBRT dosimetry.

JAEA Reports

Design study for impermeable function of trench disposal facility for very low level waste generated from research, industrial and medical facilities (Joint research)

Sakai, Akihiro; Kurosawa, Ryohei*; Nakata, Hisakazu; Okada, Shota; Izumo, Sari; Sato, Makoto*; Kitamura, Yoichi*; Honda, Yasutake*; Takaoka, Katsuki*; Amazawa, Hiroya

JAEA-Technology 2016-019, 134 Pages, 2016/10

JAEA-Technology-2016-019.pdf:8.25MB

Japan Atomic Energy Agency has been developing to design trench disposal facility with impermeable layers in order to dispose of miscellaneous waste. Geomembrane liners have a function that prevent seepage of leachant and collect the leachant. However, the geomembrane liners do not necessarily provide the expected performance due to damage generated when heavy equipment contacts with the liner. Therefore, we studied the impermeable layers having high performance of preventing seepage of leachant including radioactivity taking into account characteristics of low permeable materials and effect of multiple layer structure. As results, we have evaluated that the composite layers composed by a drainage layer, geomembrane liners and a low permeable layer are most effective structure to prevent seepage of leachant. Taking into account disposal of waste including cesium, we also considered zeolite containing sheets for adsorption of cesium were installed in the impermeable layers.

Journal Articles

Mutational effects of different LET radiations in ${it rpsL}$ transgenic ${it Arabidopsis}$

Yoshihara, Ryohei; Hase, Yoshihiro; Sato, Ryohei*; Takimoto, Koichi*; Narumi, Issei

International Journal of Radiation Biology, 86(2), p.125 - 131, 2010/02

 Times Cited Count:18 Percentile:79.59(Biology)

In an effort to assess the characteristics of mutation induced by different LET radiation in higher plants, the mutational effects of carbon-ion beams and $$gamma$$-rays were investigated in ${it Arabidopsis}$. The ${it rpsL}$ transgenic ${it Arabidopsis}$ (Arabidopsis/rpsL) mutation detection system was adopted. Dry seeds of Arabidopsis/rpsL were irradiated with $$gamma$$-rays and 208-MeV carbon ions (208-MeV $$^{12}$$C$$^{5}$$), and the mutation frequency and mutation spectrum were examined. Our result suggested that 208-MeV $$^{12}$$C$$^{5}$$ and $$gamma$$-rays induced different mutational effects in ${it Arabidopsis}$ dry seed.

Journal Articles

Silencing of CPD photolyase makes ${it Arabidopsis}$ hypersensitive and hypermutable in response to UV-B radiation

Yoshihara, Ryohei; Nakane, Chiyoko*; Sato, Ryohei*; Yasuda, Ai*; Takimoto, Koichi*

Genes and Environment, 30(2), p.53 - 61, 2008/05

We generated a CPD photolyase knock-down in ${it Arabidopsis thaliana}$ by RNAi to investigate the role of CPD photorepair for protection of plants from solar UV. These knock-down lines exhibited hypersensitivity to UV-B and an increased occurrence of mutation induced by UV-B radiation compared with ${it Arabidopsis}$ proficient in CPD photolyase. These results indicate that CPD photoreactivation plays an important role for UV resistance of ${it Arabidopsis}$ and suppression of UV-induced mutagenesis.

Journal Articles

D-T neutron skyshine experiments and the MCNP analysis

Nishitani, Takeo; Ochiai, Kentaro; Yoshida, Shigeo*; Tanaka, Ryohei*; Wakisaka, Masashi*; Nakao, Makoto*; Sato, Satoshi; Yamauchi, Michinori*; Hori, Junichi; Wada, Masayuki*; et al.

Journal of Nuclear Science and Technology, 41(Suppl.4), p.58 - 61, 2004/03

no abstracts in English

Journal Articles

Measurement of radiation skyshine with D-T neutron source

Yoshida, Shigeo*; Nishitani, Takeo; Ochiai, Kentaro; Kaneko, Junichi*; Hori, Junichi; Sato, Satoshi; Yamauchi, Michinori*; Tanaka, Ryohei*; Nakao, Makoto*; Wada, Masayuki*; et al.

Fusion Engineering and Design, 69(1-4), p.637 - 641, 2003/09

 Times Cited Count:7 Percentile:47.54(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Secondary $$gamma$$-ray measurements on the D-T neutron skyshine experiments

Tanaka, Ryohei*; Ochiai, Kentaro; Nakao, Makoto*; Yamauchi, Michinori*; Hori, Junichi; Wada, Masayuki*; Sato, Satoshi; Nishitani, Takeo

JAERI-Tech 2003-063, 62 Pages, 2003/07

JAERI-Tech-2003-063.pdf:3.41MB

no abstracts in English

Journal Articles

D-T neutron skyshine experiments at JAERI/FNS

Nishitani, Takeo; Ochiai, Kentaro; Yoshida, Shigeo*; Tanaka, Ryohei*; Wakisaka, Masashi*; Nakao, Makoto*; Sato, Satoshi; Yamauchi, Michinori*; Hori, Junichi; Takahashi, Akito*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 79(3), p.282 - 289, 2003/03

no abstracts in English

Oral presentation

Mutation analysis using ${it rpsL}$ gene in plant

Yoshihara, Ryohei; Yasuda, Ai*; Sato, Ryohei*; Hase, Yoshihiro; Narumi, Issei; Takimoto, Koichi*

no journal, , 

no abstracts in English

Oral presentation

The Importance of photorepair for plant UV protection and UV induced mutagenesis

Sato, Ryohei*; Yasuda, Ai*; Yoshihara, Ryohei; Takimoto, Koichi*

no journal, , 

no abstracts in English

Oral presentation

Application of in-air micro-PIXE to biological sample

Sakurai, Eiko*; Yanai, Kazuhiko*; Ishii, Keizo*; Oyama, Ryohei*; Sakamaki, Manabu*; Yamanaka, Kentaro*; Yamazaki, Hiromichi*; Matsuyama, Shigeo*; Kamiya, Tomihiro; Sato, Takahiro; et al.

no journal, , 

no abstracts in English

Oral presentation

Expression of mutations in the M2 generation of red pepper "Hirosaki zairai" irradiated with ion beam

Sato, Yusuke*; Maeda, Tomoo*; Honda, Kazushige*; Saga, Koichi*; Ishikawa, Ryuji*; Akita, Yusuke; Yoshihara, Ryohei; Nozawa, Shigeki; Narumi, Issei

no journal, , 

no abstracts in English

Oral presentation

Analyses of structure and dynamics with model chromatin

Tachiwana, Hiroaki*; Arimura, Yasuhiro*; Matsumoto, Ryohei*; Takizawa, Yoshimasa*; Hori, Tetsuya*; Matsumoto, Atsushi; Oda, Takashi*; Sato, Mamoru*; Kono, Hidetoshi; Fukagawa, Tatsuo*; et al.

no journal, , 

Oral presentation

Expansion property of ammonium montmorillonite

Saito, Akito*; Kawakita, Ryohei*; Sakuma, Hiroshi*; Oda, Chie; Honda, Akira; Sato, Tsutomu*

no journal, , 

To understand the swelling behavior of NH$$_{4}$$-montmorillonite (MMT), the expandability of monoionic Na-, K- and NH$$_{4}$$-MMT was investigated by XRD under controlled relative humidity (RH) conditions and molecular dynamics (MD) calculations. XRD results indicate that the expansion properties of NH$$_{4}$$-MMT are similar to that of K-MMT for RH $$>$$ 30%. At RH $$<$$ 30%, however, NH$$_{4}$$-MMT expands further and has a larger basal spacing than both Na- and K-MMT. MD calculation results showed that NH$$_{4}$$-MMT reaches a one-layer hydration state under lower RH conditions than that of Na- and K-MMT, and was entirely consistent with the above observations by XRD. It was also confirmed that an irregular motion of interlayer NH$$_{4}$$$$^{+}$$ could result from bonds between H atoms of the NH$$_{4}$$$$^{+}$$ ion and the base O atoms of MMT. This irregular motion enabled the basal spacing of NH$$_{4}$$-MMT to increase and consequently, to expand further under low RH conditions.

Oral presentation

Design study for impermeable function of trench disposal facility for very low level waste generated from research, industrial and medical facilities

Sakai, Akihiro; Nakata, Hisakazu; Amazawa, Hiroya; Kurosawa, Ryohei*; Sato, Makoto*; Kitamura, Yoichi*

no journal, , 

We consider that very low level waste slightly including chemical toxicity material among radioactive waste generated from research, industrial and medical facilities is disposed of in trench disposal facility which is equipped with impermeable layers. We studied the impermeable system which has high performance to prevent the radioactive material from leaching out of waste layer taking into account the combination of geomembrane liners and low permeable materials.

Oral presentation

Expansion and alteration behavior of NH$$_4$$-montmorillonite

Kawakita, Ryohei*; Saito, Akito*; Sakuma, Hiroshi*; Anraku, Sohtaro; Oda, Chie; Mihara, Morihiro; Sato, Tsutomu*

no journal, , 

no abstracts in English

Oral presentation

Effect of ammonium ion on expandability of montmorillonite

Kawakita, Ryohei*; Saito, Akito*; Sakuma, Hiroshi*; Anraku, Sohtaro; Oda, Chie; Mihara, Morihiro; Sato, Tsutomu*

no journal, , 

no abstracts in English

Oral presentation

Structural analyses of viscosity index improvers in lubricant by means of small-angle X-ray scattering and dynamic light scattering

Takahashi, Ryohei*; Hirayama, Tomoko*; Tamura, Kazushi*; Sato, Nobuhiro*; Sugiyama, Masaaki*; Oba, Yojiro

no journal, , 

Viscosity index improvers (VII) are important additives for lubricants to suppress the temperature dependence of viscosity index. Although the temperature dependence of viscosity index of VII was thought to be related with the temperature dependence of nanostructures, only a few experimental results have been reported so far. Therefore, we performed small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) to characterize the nanostructures of VII in the lubricant. The results show the change in molecular size with increasing temperature. The relation between the viscosity index and the nanostructures are discussed.

Oral presentation

Structural analysis on Eu-HONTA complex formed in adsorbent

Watanabe, So; Okada, Makoto*; Matsuura, Haruaki*; Kada, Wataru*; Koka, Masashi*; Yamagata, Ryohei*; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*

no journal, , 

no abstracts in English

Oral presentation

Structural analyses of viscosity index improvers in lubricant oil by small angle X-ray scattering

Takahashi, Ryohei*; Hirayama, Tomoko*; Sato, Nobuhiro*; Sugiyama, Masaaki*; Takashima, Yoriyuki*; Nakano, Taeko*; Tamura, Kazushi*; Oba, Yojiro

no journal, , 

no abstracts in English

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