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Furuta, Hiroshige*; Sato, Kaoru; Nishide, Akemi*; Kudo, Shinichi*; Saigusa, Shin*
Health Physics, 121(5), p.471 - 483, 2021/11
Times Cited Count：1 Percentile：16.35(Environmental Sciences)Low dose radiation induced "health effects" containing cancer risk for a Japanese radiation worker cohort is epidemiologically evaluated using the personal dose equivalent (Hp(10)). On the other hand, Hp(10) is not recommended for epidemiological evaluation of cancer risks, since the Hp(10) is widely used for radiological protection purposes. In addition, the cancer risk depends on organ doses rather than Hp(10). Thus, we developed a new method for estimating organ doses from Hp(10) of radiation workers. The developed method enables epidemiological analysis against Japanese radiation workers by considering the response characteristics of personal dosimeters, exposure geometry and energy, and body size of radiation workers in Japan. In the future, we will reconstruct organ dose conversion factor and will evaluate the risk of cancer mortality and morbidity using the organ dose in Japan.
Iijima, Kazuki; Hayashi, Seiji*; Tamaoki, Masanori*
Global Environmental Research (Internet), 24(2), p.85 - 93, 2021/06
Environmental radioactive contamination by the Fukushima Daiichi Nuclear Power Plant accident has clearly been declining during the passage of almost 10 years from the accident. However, the prolongation of radioactive contamination in natural ecosystems probably derived from forested area without decontamination is pointed out by many studies, so more detailed examination will be needed for environmental dynamics of bioavailable radiocesium and its transfer to ecosystems. Also for influence of radiation to organisms, effects of evacuation on wild organisms are more pronounced than direct effect from radiation, especially in Fukushima evacuation area.
CsCl-supplemented diet to evaluate the effects of low dose-rate exposureTanaka, Sota; Kinouchi, Tadatoshi*; Fujii, Tsuguru*; Imanaka, Tetsuji*; Takahashi, Tomoyuki*; Fukutani, Satoshi*; Maki, Daisuke*; Notomi, Akihiro*; Takahashi, Sentaro*
Scientific Reports (Internet), 10, p.16055_1 - 16055_7, 2020/09
Times Cited Count：7 Percentile：49.75(Multidisciplinary Sciences)Since the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident, morphological abnormalities of the lepidopteran insects have been reported. However, it is unclear whether the abnormalities were caused directly by radiation because they did not study on absorbed dose and dose-effect relationship. In this study, we conducted an internal exposure experiment on silkworm using CsCl-supplemented artificial diet and estimated the absorbed dose to evaluate the morphological abnormalities in silkworm. The ratio of wing to whole body of pupae was compared between the CsCl-exposured and control groups and no significant differences were observed between the groups. This result suggest that morphological abnormalities in lepidopterans are unlikely due to direct radiation effects from Cs contamination after the FDNPP accident.
-ray irradiated conditionYamamoto, Masahiro; Sato, Tomonori; Komatsu, Atsushi; Nakano, Junichi; Ueno, Fumiyoshi
Proceedings of European Corrosion Congress 2015 (EUROCORR 2015) (USB Flash Drive), 7 Pages, 2015/09
In Fukushima-Daiichi Nuclear Power Station, decommissioning procedures are continuing and it will take more than 30 years. As some structures are made of carbon steel, degradation by corrosion is large problem for structural reliability. To clarify an irradiation effect for corrosion of carbon steel, corrosion test was con-ducted in 
Co -ray irradiated condition. Corrosion test results showed that corrosion rates of -ray irradiated condition increased with -ray dose rates. The oxidant concentrations were also increased with -ray dose rate. From these results, a new estimation method for corrosion rate of carbon steel in water with -ray irradiated condition using radiolysis calculation is introduced and discussed.
Takahara, Shogo; Hidaka, Akihide; Ogino, Takashi*
JAEA-Data/Code 2015-001, 65 Pages, 2015/03
JAEA-Data-Code-2015-001.pdf:10.74MB
HEINPUT code is one of the preprocessor for probabilistic accident consequence assessment code OSCAAR, and estimates the risk of incidence and death due to radiation induced cancers. HEINPUT code currently uses two models developed by U.S. Nuclear Regulatory Commission (USNRC, 1985; 1993) and U.S. Environmental Protection Agency (EPA, 1994). In this report, the code was improved to enable to make calculation using the new EPA model. In addition, in order to reduce user's burden, we developed input data generator which can provide the input data for three estimation models implemented in HEINPUT-GUI based on the statistical information published.
Suzuki, Michiyo; Hattori, Yuya; Sakashita, Tetsuya; Funayama, Tomoo; Yokota, Yuichiro; Ikeda, Hiroko; Kobayashi, Yasuhiko
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 88, 2015/03
Saigusa, Shin*
Hoken Butsuri, 34(3), p.298 - 299, 1999/09
no abstracts in English
Nagaoka, Toshi; Togawa, Orihiko; Moriuchi, Shigeru; S.I.Rybalko*; Sukhoruchkin, A. K.*; S.V.Kazakov*
JAERI-Conf 94-005, 99 Pages, 1994/11
no abstracts in English
Mizushita, Seiichi; *; *
Assessment of the Health and Environmental Impact from Radiation Doses due to Released Radionuclides, 0, p.141 - 161, 1994/00
no abstracts in English
Matsuzuru, Hideo
Enerugi Rebyu, 11(9), p.13 - 17, 1991/09
no abstracts in English
Matsuzuru, Hideo
Nihon Genshiryoku Gakkai-Shi, 33(8), p.784 - 785, 1991/08
no abstracts in English
Togawa, Orihiko; Homma, Toshimitsu; Matsuzuru, Hideo; *
JAERI-M 91-005, 179 Pages, 1991/02
no abstracts in English
Ishigami, Tsutomu; ; Kobayashi, Kensuke
Nihon Genshiryoku Gakkai-Shi, 32(4), p.328 - 337, 1990/04
no abstracts in English
Kaminaga, Kiichi; Kanari, Yukiko; Sakamoto, Yuka; Narita, Ayumi; Usami, Noriko*; Kobayashi, Katsumi*; Noguchi, Miho; Yokoya, Akinari
no journal, ,
no abstracts in English
Yamamoto, Masahiro
no journal, ,
The nuclear science and engineering center is engaged in corrosion problems derived from the decommissioning procedures at Fukushima Daiichi Nuclear Power Station. Our viewpoints are effects of irradiation from radioactive materials into cooling water. Some experiments were conducted at -ray irradiation facilities in Takasaki Advanced Radiation Research Institute. This report introduces several results in these experiments and also the future research issues.
Suzuki, Michiyo; Hattori, Yuya; Kobayashi, Yasuhiko
no journal, ,
no abstracts in English
Kanzaki, Norie; Sakoda, Akihiro; Kataoka, Takahiro*; Yamaoka, Kiyonori*
no journal, ,
It is not easy to evaluate fuzzy effects of low-dose radiation by basic statistical analysis or basic machine learning. In the present study, the modification of self-organizing maps, which is a kind of machine learning, was made for the evaluation of such effects: namely many reference vectors which learned input dataset by self-organizing maps were reanalyzed with the same technique. Based on this procedure, we analyzed a dataset about low-dose radiation as well as a benchmark dataset, suggesting that the modified self-organizing maps can work even for input data with complex topology and data distribution.
Kanzaki, Norie; Sakoda, Akihiro; Kataoka, Takahiro*; Ishida, Tsuyoshi; Tanaka, Hiroshi; Yamaoka, Kiyonori*
no journal, ,
The aim of this study is to develop a novel radiation risk assessment for the evaluation of radiation-induced "health-loss" by means of Taguchi method that is known as Quality Engineering. In this study, radiation risk was defined as "health-loss", and then we assessed the effects of irradiation in mice with lipopolysaccharide (LPS) induced inflammation using Taguchi's loss function for the formulation of both harmful effects and beneficial effects. LPS 25 and 100 ug were found to be non-lethal dose and lethal dose 46%, respectively. The CRP levels of LPS-treated mice were increased significantly. Next, we assessed the effects of irradiation 4 hours after normal mice were irradiated with X-ray of 0.1, 0.5, or 3.0 Gy. In the case of only irradiation without LPS administration, CRP was not changed. CRP of LPS and X-ray treated mice had a greater tendency to increase than that of LPS treated mice, although the opposite trend was observed in LPS (100 ug) and X-ray (0.1 Gy) treated mice. Finally, we set the conditions of treatments to mouse as the controllable factors and calculated Taguchi's SN-ratio for the smaller the better. Therefore, we found that low-dose irradiation inhibited inflammation because SN-ratio of 0.1 Gy irradiation group was the maximum.
