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Moribayashi, Kengo
Journal of Plasma and Fusion Research SERIES, Vol.7, p.150 - 153, 2006/00
no abstracts in English
Yokota, Yuichiro; Hase, Yoshihiro; Shikazono, Naoya; Tanaka, Atsushi; Inoue, Masayoshi*
International Journal of Radiation Biology, 79(8), p.681 - 685, 2003/08
Times Cited Count：21 Percentile：78.49(Biology)To determine the radiation sensitivity and the relationship between linear energy transfer (LET) and relative biological effectiveness (RBE) in single plant cells irradiated with heavy ions, single tobacco (BY-2) cells were irradiated with carbon ions (78.6 to 309 kev/
m) and gamma rays (0.2 kev/m). Two weeks after the irradiation, colonies derived from the irradiated cells that had 16 cells or more were counted as survivors. The surviving fraction was fitted using the single-hit, multitarget theory. The dose needed to reduce the surviving fraction of the cells to 0.1 (D
) of gamma rays and carbon ions were 47.2 and 10.5 to 12.6 Gy, respectively. The radiation sensitivity of single tobacco cells was much lower than that of mammalian cells, although the mean number of base pairs per chromosome in the two cell types is similar. The RBE based on the D peaked at a LET of 247 keV/m. The RBE peak based on the D of carbon ions in single tobacco cells occurred at a higher LET than it dose in other organisms.
Aruga, Takeo; Katano, Yoshio; Omichi, Toshihiko; Okayasu, Satoru; Kazumata, Yukio
Nuclear Instruments and Methods in Physics Research B, 166-167, p.913 - 919, 2000/05
Times Cited Count：32 Percentile：86.9(Instruments & Instrumentation)no abstracts in English
superconductor by high-energy heavy ion irradiationSasase, Masato; Sato, Takahiro*; Okayasu, Satoru; Kurata, Hiroki; Hojo, Kiichi
Advances in Superconductivity XII, p.314 - 316, 2000/00
no abstracts in English
Taguchi, Mitsumasa; Furukawa, Katsutoshi; Moriyama, Masahiro*; Ono, Shinichi*
JAERI-Review 99-025, TIARA Annual Report 1998, p.91 - 92, 1999/10
no abstracts in English
Namba, Hideki
Radioisotopes, 44(1), p.69 - 72, 1995/01
no abstracts in English
Namba, Hideki; Aoki, Yasushi; Furukawa, Katsutoshi; Ono, Shinichi; Komaki, Yoshihide
Dai-4-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.131 - 134, 1991/07
no abstracts in English
Nagaishi, Ryuji; Matsumura, Taichi; Okumura, Keisuke
no journal, ,
no abstracts in English
Nagaishi, Ryuji
no journal, ,
no abstracts in English
Ishikawa, Akihisa*; Koba, Yusuke*; Furuta, Takuya; Chang, W.*; Hashimoto, Shintaro; Yonai, Shunsuke*; Matsumoto, Shinnosuke*; Sato, Tatsuhiko
no journal, ,
There found to be a relationship between the dose-averaged linear energy transfer LETd and local tumor control in carbon-ion radiotherapy (CIRT). However, only physical dose and biological dose are registered in the past treatment records of CIRT in QST hospital and LETd can not be deduced directly. There is a method to estimate LETd based on RBE-LETd-fitted function but some problems such as non-singularity at the end point of carbon ions are known. On the other hand, we propose a method to reproduce the CIRT by reconstructing the beam transport geometry based on the treatment planning data and conduct Monte Carlo simulation. The LETd can be also computed directly. We therefore compared LETd obtained by Monte Carlo simulation with estimated LETd using the treatment planning data. We found that underestimation around the end point of carbon ions but the influence was local and thus the LETd estimates are valid for the purpose computing in organ scale.
Nagaishi, Ryuji; Ito, Tatsuya; DiPrete, D.*; Fellinger, A.*
no journal, ,
In the 1F decommissioning, the retrieval of fuel debris is planned, and then the importance of water radiolysis by alpha-rays becomes increasing in the debris storage more than 10 years after the accident. When alpha-emitting nuclides are contained in insoluble solid materials, the alpha-rays slowdown in the materials, and the energies of alpha-rays escaped from the materials become lower and continuous. The energy spectrum varies with the type and size of materials, and this spectral difference affects the pattern and magnitude of G-value of water radiolysis. Therefore, in order to study the alpha-radiolysis, it is necessary to measure and evaluate the material-dependent spectrum. In this study, we used solid material powders containing plutonium 239 (Pu-239) and measured the alpha-ray spectrum from the powders to estimate the linear energy transfer (LET) of alpha-rays. It was further compared with that when the nuclide is a dissolved species in water.
