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Journal Articles

A Probabilistic Approach to Assess External Doses to the Public Considering Spatial Variability of Radioactive Contamination and Interpopulation Differences in Behavior Pattern

Takahara, Shogo; Iijima, Masashi*; Yoneda, Minoru*; Shimada, Yoko*

Risk Analysis, 39(1), p.212 - 224, 2019/01

 Times Cited Count:3 Percentile:19.24(Public, Environmental & Occupational Health)

A dose assessment model was developed based on measurements and surveys of individual doses and relevant contributors in Fukushima City for four population groups: Fukushima City Office staff, Senior Citizens' Club, Contractors' Association, and AgriculturalCooperative. In addition, probabilistic assessments were performed for these population groups by considering the spatial variability of contamination and interpopulation differencesresulting from behavior patterns. As a result of comparison with the actual measurements, the assessment results for participants from the Fukushima City Office, Senior Citizens' Club and the Agricultural Cooperative agreed with the measured values. By contrast, the measurements obtained for the participants from the Contractors' Association were not reproduced well in the present study. To assess the doses to this group, further investigations of association members' work activities and the related dose reduction effects are needed.

Journal Articles

Estimation of radiocesium dietary intake from time series data of radiocesium concentrations in sewer sludge

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Yoneda, Minoru*

Environment International, 115, p.196 - 204, 2018/06

 Times Cited Count:1 Percentile:88.59(Environmental Sciences)

Journal Articles

Bioaccessibility of Fukushima-accident-derived Cs in soils and the contribution of soil ingestion to radiation doses in children

Takahara, Shogo; Ikegami, Maiko*; Yoneda, Minoru*; Kondo, Hitoshi*; Ishizaki, Azusa; Iijima, Masashi; Shimada, Yoko*; Matsui, Yasuto*

Risk Analysis, 37(7), p.1256 - 1267, 2017/07

AA2015-0445.pdf:0.53MB

 Times Cited Count:4 Percentile:36.59(Public, Environmental & Occupational Health)

Journal Articles

Journal Articles

Bioaccessibility of radioactive cesium in soils

Takahara, Shogo; Ikegami, Maiko*; Yoneda, Minoru*; Kondo, Hitoshi*; Ishizaki, Azusa; Shimada, Yoko*

Dai-21-Kai Chikasui, Dojo Osen To Sono Boshi Taisaku Ni Kansuru Kenkyu Shukai Koenshu (CD-ROM), p.505 - 510, 2015/06

BB2014-3402.pdf:0.58MB

Doses received by the public are necessary information in management of radiation exposures in areas contaminated by the Fukushima Daiichi Nuclear Power Plant (1F) accident. Direct ingestion of contaminated soil is one of the exposure pathways which is a concern for the people living in the areas in terms of children's exposure. Therefore in order to manage efficiently the middle and the long term exposures with a sense of safety of the people, we have to clarify the contribution of this pathway to the doses received by those. However, a fractional absorption of radioactive cesium in gastrointestinal system has not been evaluated yet. We evaluated this factor based on the results of a physiologically based extraction test and an extraction test with hydrochloric acid, which is adopted in Japanese national law to evaluate a fractional absorption of heavy metals in gastrointestinal system. In addition, we assessed the doses to the public from this pathway after the 1F accident.

Journal Articles

Temporal and spatial variations of radiocarbon in Japan Sea Bottom Water

Kumamoto, Yuichiro*; Aramaki, Takafumi*; Watanabe, Shuichi*; Yoneda, Minoru*; Shibata, Yasuyuki*; Togawa, Orihiko; Morita, Masatoshi*; Shitashima, Kiminori*

Journal of Oceanography, 64(3), p.429 - 441, 2008/06

 Times Cited Count:10 Percentile:72.18(Oceanography)

In 1995 and 2000, radiocarbon ratio ($$Delta$$$$^{14}$$C) of total dissolved inorganic carbon was measured in the Japan Sea, a semi-closed marginal sea in the western North Pacific, where deep and bottom waters are formed in itself. Compiling them with historical radiocarbon data in the Japan Sea, temporal and spatial variations of the radiocarbon in the bottom water below 2000 m depth were elucidated. $$Delta$$$$^{14}$$C in the bottom waters in the western Japan and Yamato Basins increased by about 20 ‰ between 1977/79 and 1995 and did not changed between 1995 and 1999/2000, suggesting penetration of surface bomb-produced radiocarbon into the bottom waters due to bottom ventilation in the earlier period and stagnation of the bottom ventilation in the following period, respectively. In the eastern Japan Basin, the bottom $$Delta$$$$^{14}$$C increased by about 10 ‰ between 1977/79 and 2002, suggesting less ventilation of the bottom water in the basin. The temporal changes of the radiocarbon, tritium, and dissolved oxygen suggest sporadic occurrences of the bottom ventilation between 1979 and 1984 and its stagnation between 1984 and 2004 in the eastern Japan and Yamato Basins. The former is probably due to spreading of a newly ventilated bottom water in the western Japan Basin in the severe winter of 1976-1977 along the abyssal circulation in the Japan Sea. The latter does not conflict with temporal changes of bomb-produced $$^{137}$$Cs and chlorofluorocarbon-11 in the bottom water.

JAEA Reports

None

; Yoneda, Shigeo*; Koyakaichi, Minoru*

PNC-TJ7308 93-005, 292 Pages, 1993/03

PNC-TJ7308-93-005.pdf:6.95MB

no abstracts in English

JAEA Reports

None

Yoneda, Shigeo*; Koyakaichi, Minoru*; Sakuramoto, Yuji*

PNC-TJ7308 91-001VOL1, 119 Pages, 1991/03

PNC-TJ7308-91-001VOL1.pdf:3.08MB

no abstracts in English

Oral presentation

Time-dependence of radiocesium concentration in separate sewer sludge; A New method to estimate the ingestion intake of cesium

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Homma, Toshimitsu; Yoneda, Minoru*

no journal, , 

Oral presentation

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 5; Investigation of deposition rate in real houses

Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Munakata, Masahiro; Kimoto, Shigeru*; Yoneda, Minoru*; Matsui, Yasuto*

no journal, , 

no abstracts in English

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 4; Investigation of penetration factor with a test chamber

Kimoto, Shigeru*; Sadatani, Yoshiro*; Yoneda, Minoru*; Matsui, Yasuto*; Hirouchi, Jun

no journal, , 

no abstracts in English

Oral presentation

Experimental evaluation on behavior of iodine gas

Kimoto, Shigeru*; Shiota, Kenji*; Nishiguchi, Kohei*; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*

no journal, , 

no abstracts in English

Oral presentation

Measurement experiment of particle deposition rate and ventilation rate in houses

Shakagori, Shota*; Murai, Chiaki*; Kimoto, Shigeru*; Matsui, Yasuto*; Yoneda, Minoru*; Hirouchi, Jun

no journal, , 

no abstracts in English

Oral presentation

Bioaccessibility of Cs-137 in wild boars contaminated by the Fukushima Daiichi Nuclear Power Plant accident

Takahara, Shogo; Pratama, M. A.*; Ikegami, Maiko*; Fukutani, Satoshi*; Yoneda, Minoru*

no journal, , 

We experimentally evaluated the absorption fraction in gastrointestinal system of Cs-137 in wild boar meat contaminated by the Fukushima Daiichi Nuclear Power Plant accident. Wild boar was hunted in difficult-to-return zone in December 2017. For three parts of the meat (Loin, Brisket, Round), extraction tests were performed based on in-vitro digestion method by Minekus et al. (2014). From this test, the extraction rate in small intestinal was evaluated as 89%$$pm$$3%.

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