著者
西原 健司 山岸 功 安田 健一郎 石森 健一郎 田中 究 久野 剛彦 稲田 聡 後藤 雄一
出版者
Atomic Energy Society of Japan
雑誌
日本原子力学会和文論文誌 (ISSN:13472879)
巻号頁・発行日
pp.1202060058, (Released:2012-02-08)
参考文献数
15
被引用文献数
29 35

After the severe accident in the Fukushima-1 nuclear power plant, a large amount of contaminated stagnant water has been produced in turbine buildings and surrounding areas. This rapid communication reports the calculation of the radionuclide inventory in the core, the collection of the measured inventory in the stagnant water, and the estimation of the radionuclide release ratios from the core to the stagnant water. The present evaluation is based on data obtained before June 3, 2011. It was revealed that the release ratios of tritium, iodine and cesium were several tens of percent, while those of strontium and barium were smaller by one or two orders of magnitude. These release ratios of the Fukushima accident were equivalent to those of the TMI-2 accident.
著者
西原 健司 山岸 功 安田 健一郎 石森 健一郎 田中 究 久野 剛彦 稲田 聡 後藤 雄一
出版者
Atomic Energy Society of Japan
雑誌
日本原子力学会和文論文誌 (ISSN:13472879)
巻号頁・発行日
vol.11, no.1, pp.13-19, 2012 (Released:2012-02-15)
参考文献数
15
被引用文献数
30 35

After the severe accident in the Fukushima-1 nuclear power plant, a large amount of contaminated stagnant water has been produced in turbine buildings and surrounding areas. This rapid communication reports the calculation of the radionuclide inventory in the core, the collection of the measured inventory in the stagnant water, and the estimation of the radionuclide release ratios from the core to the stagnant water. The present evaluation is based on data obtained before June 3, 2011. It was revealed that the release ratios of tritium, iodine and cesium were several tens of percent, while those of strontium and barium were smaller by one or two orders of magnitude. These release ratios of the Fukushima accident were equivalent to those of the TMI-2 accident.
著者
熊谷 友多 永石 隆二 木村 敦 田口 光正 西原 健司 山岸 功 小川 徹
出版者
Atomic Energy Society of Japan
雑誌
日本原子力学会和文論文誌 (ISSN:13472879)
巻号頁・発行日
pp.1109220008, (Released:2011-09-27)
参考文献数
15
被引用文献数
3 3

Zeolite is used for decontamination of radioactive water containing salts from seawater in the Fukushima Dai-ichi Nuclear Power Station. Evaluation of hydrogen production by water radiolysis during the process is important for a safe operation. Thus, hydrogen production from the mixture of zeolite and seawater was studied by γ-radiolysis experiment, and the hydrogen production during the process was evaluated. The measured yield of hydrogen from seawater was comparable to the primary yield in the γ-radiolysis of water. This result indicates that oxidation of hydrogen by radical products of water radiolysis is not effective in seawater. The measured yield from the mixture decreased at a high weight fraction of zeolite. However, the measured yield was higher than that expected from the direct radiolysis of water in the mixture, which would decrease proportionally to the weight fraction of water. This result suggests that the radiation energy deposited on zeolite is involved in hydrogen formation. From the measured yields, the hydrogen production rate was evaluated to be 3.6 mL/h per ton of radioactive water before the process and 1.5 L/h per ton of the waste adsorbent after the process.
著者
内田 丈聖 岡 美里 西原 健 坂谷 洋一郎 長田 隆
出版者
公益社団法人 日本食品科学工学会
雑誌
日本食品科学工学会誌 (ISSN:1341027X)
巻号頁・発行日
pp.NSKKK-D-23-00012, (Released:2023-05-11)

日向夏飲料の微生物学的安全性確保のために,原材料製造工程における日向夏搾汁について,各種細菌芽胞の汚染度を調べた.計11試料において,好気培養では51菌株,嫌気培養では12菌株を分離し,TABについては検出されなかった.また,分離した菌株のうち,Paenibacillus属細菌を最も多く検出し,その他Bacillus属,Paraclostridium属,Clostridium属細菌を得た,これより,これら細菌種が日向夏100%ジュース(pH3.1)中で発育できないため,殺菌指標菌として管理する必要はないことがわかった.今回の実験では検出できなかったTABだが,過去の変敗事例や本菌種の諸性質を考慮すると,殺菌指標菌として検討する必要がある.そのため,今後はTABによる日向夏100%ジュース中での発育試験を行い,発育する場合は,加熱殺菌指標菌として適切な加熱殺菌条件を設定して管理すべきと考える.また,さまざまな野菜汁や果汁を混ぜるミックスジュースでは,pHによってはPaenibacillus属が発育する可能性があるので注意が必要である.
著者
西原 健司 山岸 功 安田 健一郎 石森 健一郎 田中 究 久野 剛彦 稲田 聡 後藤 雄一
出版者
Atomic Energy Society of Japan
雑誌
日本原子力学会和文論文誌 (ISSN:13472879)
巻号頁・発行日
vol.11, no.3, pp.247, 2012 (Released:2012-08-15)

日本原子力学会和文論文誌 Vol. 11, No. 1 (2012), pp.13-19   著者の申し出により,14–16頁の Table 4, 7(1/2), 7(2/2)に誤りがありましたので,PDFの通り訂正いたします。