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Tanimura, Yoshihiko; Tsuji, Tomoya
no journal, ,
no abstracts in English
Matsuya, Yusuke; Sato, Tatsuhiko; Hamada, Nobuyuki*
no journal, ,
Radiation effects on lens epithelial cells and the risk of cataracts after long-term low-dose-rate exposure have not yet been elucidated. Cellular responses of lens epithelial cells play a key role in clarifying the risk of cataract after radiation exposure. In this study, aiming to elucidate the biological effects of human lens epithelial cells (HLECs), we measured DNA double-strand breaks (DSB) and cell death induced at various dose rates. As an experimental results, HLEC showed inverse dose rate effects that more effects at lower rather than at higher dose rates. In the presentation, we also plan to report the results of analysis of these measured values using a prediction model. This work would contribute to a more accurate understanding of the risk of cataracts.
Murota, Shuhei; Manabe, Kentaro; Takahashi, Fumiaki
no journal, ,
JAEA has been developing the Internal Dose Calculation Code, IDCC, which incorporates the ICRP 2007 Recommendations. The IDCC has functions to calculate effective dose coefficients considering the chemical forms of radionuclides and intake routes, and to estimate intake doses using individual monitoring results. As these functions are useful not only in research activities but also in dose controls and professional education, projects for their popularization are already underway. In this presentation, we will report on the current development status and the plan for the trial usage workshop.
Am calibration field and in the X-ray calibration fieldTsuji, Tomoya; Yoshitomi, Hiroshi; Tanimura, Yoshihiko
no journal, ,
Takahashi, Akina; Yokota, Tomokazu*; Morifuji, Masayuki; Nishimura, Shusaku; Izaki, Kenji
no journal, ,
no abstracts in English
Sato, Tatsuhiko
no journal, ,
Past evaluation of RBE, Radiation quality factor, and radiation weighting factor will be reviewed, and the possibility for their future revisions will be discussed at the meeting.
Fujita, Hiroki; Yokoyama, Hiroya; Maehara, Yushi; Takada, Chie
no journal, ,
no abstracts in English
Kobayashi, Kenji; Ishii, Tatsuya; Tsubota, Yoichi; Shioya, Satoshi; Ishibashi, Nauya; Nakagawa, Takahiro
no journal, ,
no abstracts in English
Ishii, Tatsuya; Kobayashi, Kenji; Tsubota, Yoichi; Shioya, Satoshi; Ishibashi, Nauya; Nakagawa, Takahiro
no journal, ,
no abstracts in English
Kato, Tatsuki; Hirato, Misaki; Matsuo, Kazuki; Takahashi, Akina; Tamura, Ken; Nagaoka, Mika; Yamazaki, Takumi; Nakagawa, Takahiro
no journal, ,
no abstracts in English
Satoh, Daiki; Petoussi-Henss, N.*
no journal, ,
Dose-rate coefficients, which immediately derive dose rates for radiation exposure from measurable physical quantities, are extremely important in dose assessment for radiation protection. The International Commission on Radiological Protection (ICRP) had developed dose-rate coefficients that convert the radioactivity concentrations of 1252 nuclides of 97 elements distributed at various depths in soil to dose rates above the ground and compiled them in the Publication 144. However, data for volumetric sources simulating soil in landfills containing naturally occurring radioactive materials (NORMs) were not available, and therefore, dose rate coefficients were required to be used in dose assessment to the public living there. In this study, dose-rate coefficients for nuclides uniformly distributed in soil to an effective infinite depth were developed based on the data of ICRP Publication 144. The present results were compared with those of previous studies for several nuclides and found to agree within about 10%. From the results, we concluded that the systematic database of the dose-rate coefficients was successfully developed based on the ICRP data and methods, and the database would greatly contribute to the dose assessment of long-term exposure of the public by NORM.
Watanabe, Yuki; Hosomi, Kenji; Kawasaki, Kohei*; Ezaki, Iwao*; Takada, Chie
no journal, ,
no abstracts in English
Sakoda, Akihiro; Ishimori, Yuu
no journal, ,
no abstracts in English
Igarashi, Yu; Hamaguchi, Takumi; Maeda, Eita; Yamada, Junya; Muto, Yasunobu; Tanigaki, Minoru*; Nohara, Naofumi
no journal, ,
At the JAEA Oarai Research Establishment, a portable KURAMA equipped with a data transmission function through an autonomous network using the ZETA standard was permanently installed near the MP for the purpose of redundancy in the measurement of monitoring points, and a system for observing radiation doses near the site boundary was developed. In this presentation, we report on the fixed point observation data for about one year using this system.