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Journal Articles

Storage characteristics of KBr:Eu$$^{2+}$$ phosphors with radiators by irradiation of fast neutrons

Sakasai, Kaoru; Iwamoto, Yosuke; To, Kentaro; Nakamura, Tatsuya; Takakura, Kosuke; Konno, Chikara

2010 IEEE Nuclear Science Symposium Conference Record (CD-ROM), p.966 - 970, 2010/10

Storage characteristics of KBr:Eu$$^{2+}$$ phosphor were investigated when the phosphor was irradiated by fast neutron with energy of 14.8 MeV. To improve the fast neutron sensitivity, polyethylene (PE) sheets as a proton generator were set in front of the phosphors. The maximum photostimulated luminescence (PSL) yields were obtained at a PE thickness of about 3 mm. These experimental results well agreed with those by Monte Carlo simulation using PHITS code. Estimated PSL yields by $$gamma$$-ray associated with fast neutron fields were negligible. This combination use of such phosphors and PE sheets will be usable for fast neutron monitoring or imaging.

Journal Articles

Lattice dynamics of the Zn-Mg-Sc icosahedral quasicrystal and its Zn-Sc periodic 1/1 approximant

de Boissieu, M.*; Francoual, S.*; Minalkovi$v{c}$, M.*; Shibata, Kaoru; Baron, A. Q. R.*; Sidis, Y.*; Ishimasa, Tsutomu*; Wu, D.*; Lograsso, T.*; Regnault, L.-P.*; et al.

Nature Materials, 6(12), p.977 - 984, 2007/12

 Times Cited Count:36 Percentile:79.91(Chemistry, Physical)

We have carried out inelastic X-ray and neutron scattering experiments on single-grain samples of the Zn-Mg-Sc icosahedral quasicrystal and of the Zn-Sc periodic cubic 1/1 approximant, with the aim of studying the respective influence of the local order and the long-range order (periodic or quasiperiodic) on lattice dynamics. Besides the overall similarities and the existence of a pseudo-gap in the transverse dispersion relation, marked difference are observed, the pseudo-gap being larger and better defined in the approximant than in the quasicrystal. These results are compared with simulations on atomic models and using oscillating pair potentials, and the simulations reproduce in detail the experimental results.

Journal Articles

Role of DNA-PKcs in the bystander effect after low- or high-LET irradiation

Kanasugi, Yuichi*; Hamada, Nobuyuki*; Wada, Seiichi*; Funayama, Tomoo; Sakashita, Tetsuya; Kakizaki, Takehiko; Kobayashi, Yasuhiko; Takakura, Kaoru*

International Journal of Radiation Biology, 83(2), p.73 - 80, 2007/02

 Times Cited Count:30 Percentile:89.28(Biology)

no abstracts in English

Journal Articles

Chromosomal aberrations by medium-mediated bystander effects induced by high-LET radiations

Takakura, Kaoru*; Kanasugi, Yuichi*; Hamada, Nobuyuki*; Wada, Seiichi*; Funayama, Tomoo; Sakashita, Tetsuya; Kakizaki, Takehiko; Kobayashi, Yasuhiko

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 112, 2007/02

no abstracts in English

Journal Articles

EPR studies of 5-bromouracil crystal after irradiation with X-rays in the bromine K-edge region

Yokoya, Akinari; Takakura, Kaoru*; Watanabe, Ritsuko; Akamatsu, Ken*; Ito, Takashi*

Radiation Research, 162(4), p.469 - 473, 2004/10

Radicals induced in a single crystal of 5-bromouracil (BrUra) by synchrotron soft X-rays in the Br K-edge region (13.461-13482 keV) were investigated using the X-band EPR method. The crystal was irradiated at three peak energies in the absorption spectrum at room temperature or at 80K. A hydrogen abstraction radical derived from N1 atom of the pyrimidine ring was commonly observed for all of the energies used, though with some variation in quantity. Similar characteristics were also observed in the EPR signal for the off-K-edge low energy (13.42 keV) and when $$^{60}$$Co $$gamma$$-ray irradiation was employed as the reference. When irradiated at 80K, a much larger exposure (roughly 10 times) of soft X-rays was needed to obtain the same signal intensity as that observed at room temperature. EPR signals were not detectable with g-irradiation at liquid nitrogen temperature.

Journal Articles

EPR studies of 5-bromouracil crystal after irradiation with X rays in the bromine K-edge region

Yokoya, Akinari; Takakura, Kaoru*; Watanabe, Ritsuko; Akamatsu, Ken*; Ito, Takashi*

Radiation Research, 162(4), p.469 - 473, 2004/10

 Times Cited Count:2 Percentile:7.41(Biology)

X-ray absorption spectra from single crystals of 5-Bromouracil were measured with the transmission mode in the energy range from 13.41 to 13.50 keV using the linearly polarized synchrotron radiation (SR). A characteristic resonance structure, consisting of four peaks, was recognized in the spectra in the Br K-edge region. The intensities of these peaks were strongly dependent on the crystal rotation about the normal of the crystal b-c plane, which was set perpendicular to the X-ray beam direction. (SR X-rays are polarized in the horizontal plane.) Molecular orbital calculations indicate that these resonance peaks are associated with the transitions from the 1s electron of Br to the Br-C molecular antibonding orbitals and to a shape resonance. The observed anisotropy of each photoabsorption peak might originate from the angular dependences of these molecular orbitals.

Oral presentation

Interaction of tumor suppressor protein p53 by heavy-ion beam irradiation

Aotani, Hideaki*; Funayama, Tomoo; Wada, Seiichi*; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Hasan, K.*; Kaul, S.*; Takakura, Kaoru*

no journal, , 

no abstracts in English

Oral presentation

Bystander effect of heavy ion beam on chromosomal aberrations mediated by medium soluble factors

Kanasugi, Yuichi*; Funayama, Tomoo; Wada, Seiichi*; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Takakura, Kaoru*

no journal, , 

no abstracts in English

Oral presentation

Role of DNA-PKcs in induction of chromosomal aberrations by medium-mediated bystander effects of low- and high-LET radiations

Takakura, Kaoru*; Kanasugi, Yuichi*; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko; Funayama, Tomoo; Sakashita, Tetsuya; Kakizaki, Takehiko

no journal, , 

no abstracts in English

Oral presentation

Medium-mediated bystander induction of chromosomal aberrations by heavy ions and role of DNA-PKcs

Takakura, Kaoru*; Kanasugi, Yuichi*; Hamada, Nobuyuki*; Wada, Seiichi*; Funayama, Tomoo; Sakashita, Tetsuya; Kakizaki, Takehiko; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

The Bystander effect of heavy ions in confluent human fibroblasts

Hamada, Nobuyuki*; Ni, M.; Kanasugi, Yuichi*; Iwakawa, Mayumi*; Imadome, Kaori*; Funayama, Tomoo; Sakashita, Tetsuya; Sora, Sakura*; Imai, Takashi*; Takakura, Kaoru*; et al.

no journal, , 

Oral presentation

The Bystander effect of heavy-ion radiation in normal human fibroblasts

Hamada, Nobuyuki*; Iwakawa, Mayumi*; Imadome, Kaori*; Kanasugi, Yuichi*; Funayama, Tomoo; Sakashita, Tetsuya; Takakura, Kaoru*; Imai, Takashi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

The Bystander effect of heavy-ion radiation in normal human fibroblasts

Hamada, Nobuyuki*; Iwakawa, Mayumi*; Kanasugi, Yuichi*; Imadome, Kaori*; Funayama, Tomoo; Sakashita, Tetsuya; Takakura, Kaoru*; Imai, Takashi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

Analysis of tungsten in the carbon deposition layer in JT-60U

Watanabe, Jun*; Fukumoto, Masakatsu*; Otsuka, Yusuke*; Ueda, Yoshio*; Arai, Takashi; Asakura, Nobuyuki; Nakano, Tomohide; Sato, Masayasu; Yagyu, Junichi; Ochiai, Kentaro; et al.

no journal, , 

no abstracts in English

Oral presentation

Storage characteristics of KCl:Eu$$^{2+}$$-polyethrene phosphors by irradiation of fast neutrons

Sakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Takakura, Kosuke; Konno, Chikara; Iwamoto, Yosuke

no journal, , 

no abstracts in English

Oral presentation

Application of KCl:Eu$$^{2+}$$ storage phosphor to wide-range neutron detection

Sakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Takakura, Kosuke; Konno, Chikara; Iwamoto, Yosuke

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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