Kenichi Ito, Hidetaka Miyahara, T. Ujiie, Toshikatsu Takeshima, S. Yokoyama, Kotaro Nakata, Tetsushi Nagano, Tsutomu Sato, T. Hatta, H. Yamada
{"title":"Practical Approach to Decontamination of Radioactive Cesium-Contaminated Matter in Agricultural Region by Improved Wet Classification and Use of Geomaterials","authors":"Kenichi Ito, Hidetaka Miyahara, T. Ujiie, Toshikatsu Takeshima, S. Yokoyama, Kotaro Nakata, Tetsushi Nagano, Tsutomu Sato, T. Hatta, H. Yamada","doi":"10.3327/TAESJ.J12.010","DOIUrl":"https://doi.org/10.3327/TAESJ.J12.010","url":null,"abstract":"Kenichi ITO1,, Hidetaka MIYAHARA2, Toru UJIIE3, Toshikatsu TAKESHIMA4, Shingo YOKOYAMA5, Kotaro NAKATA5, Tetsushi NAGANO6, Tsutomu SATO7, Tamao HATTA8 and Hirohisa YAMADA2 1Department of Geo Environmental Preservation, Center for International Relations, University of Miyazaki, 11 Gakuenkibanadai-nishi, Miyazaki-shi, Miyazaki 8892192, Japan 2Environmental Remediation Materials Unit, Environment and Energy Materials Division, National Institute for Materials Science, 11 Namiki, Tsukuba-shi, Ibaraki 3050044, Japan 3Japan Conservation Engineers & Co., Ltd., 11211 Kitaurawa, Urawa-ku, Saitama 3300074, Japan 4Astec Tokyo Co., Ltd., 5213 Hirai, Edogawa-ku, Tokyo 1320035, Japan 5Nuclear Fuel Cycle Backend Research Center, Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba 2701194, Japan 6Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 24 Shirakatashirane, Tokai-mura, Naka-gun, Ibaraki 3191195, Japan 7Division of Sustainable Resources Engineering, Department of Socio-Environmental Engineering, Faculty and Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 0608628, Japan 8Environmental Resources Division, Japan International Research Center for Agricultural Sciences, 11 Ohwashi, Tsukuba-shi, Ibaraki 3058686, Japan","PeriodicalId":121793,"journal":{"name":"Insights Concerning the Fukushima Daiichi Nuclear Accident Vol. 4","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133114911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Tanimura, H. Hirayama, K. Kondo, H. Nagata, K. Iwanaga, Seishiro Suzuki
{"title":"Photon Spectra Measured above Operating Floor of Unit 3 Reactor at Fukushima Daiichi Nuclear Power Station","authors":"Y. Tanimura, H. Hirayama, K. Kondo, H. Nagata, K. Iwanaga, Seishiro Suzuki","doi":"10.3327/TAESJ.J16.001","DOIUrl":"https://doi.org/10.3327/TAESJ.J16.001","url":null,"abstract":"Photon energy spectra were measured above the operating floor of unit 3 reactor at the Fukushima Daiichi Nuclear Power Station by using a CdZnTe semiconductor spectrometer. The spectrometer was installed in a lead collimator to measure the photons from the area directly below the detector. The collimator and spectrometer were lifted up by a huge crane and set above the operating floor. The photon spectra were derived by unfolding the pulse height spectra measured using the spectrometer. The response function of the spectrometer was calculated with the MCNP-4C code and was used as an input parameter of the unfolding code MAXED. It was found from the photon energy spectra that low-energy photons with energy below 0.4 MeV were dominant above the operating floor. These spectra are fundamental data for evaluating the dose reduction effect by setting up shields on the operating floor.","PeriodicalId":121793,"journal":{"name":"Insights Concerning the Fukushima Daiichi Nuclear Accident Vol. 4","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125100394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Leaching of Cs and Sr from Sewage Sludge Ash Buried in a Landfill Site","authors":"N. Ishikawa, A. Ito, T. Umita","doi":"10.3327/TAESJ.J13.021","DOIUrl":"https://doi.org/10.3327/TAESJ.J13.021","url":null,"abstract":"Nao ISHIKAWA1,, Ayumi ITO2 and Teruyuki UMITA1 1Department of Civil and Environmental Engineering, Iwate University, 435 Ueda, Morioka-shi, Iwate 0208551, Japan 2Department of Frontier Materials and Function Engineering, Graduate School of Engineering, Iwate University, 435 Ueda, Morioka-shi, Iwate 0208551, Japan (Received February 4, 2014; accepted in revised form April 14, 2014; published online July 10, 2014)","PeriodicalId":121793,"journal":{"name":"Insights Concerning the Fukushima Daiichi Nuclear Accident Vol. 4","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129301051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Sanami, S. Sasaki, K. Iijima, Y. Kishimoto, Kiwamu Saito
{"title":"Time Variations in Dose Rate and γ Spectrum Measured at Tsukuba City, Ibaraki, due to the Accident of Fukushima Daiichi Nuclear Power Station","authors":"T. Sanami, S. Sasaki, K. Iijima, Y. Kishimoto, Kiwamu Saito","doi":"10.3327/TAESJ.J11.024","DOIUrl":"https://doi.org/10.3327/TAESJ.J11.024","url":null,"abstract":"The time variations in the dose rate and γ spectrum of radio nuclides originating from the accident of Fukushima Daiichi Nuclear Power Station were measured at Tsukuba City, Ibaraki, during the period from 15th March to 9th April 2011. The radiation dose peaked three times during the period from 15th to 16th March (1.27 μSv/h at maximum). The contribution of Xe-133 to the dose rate was observed from the γ spectrum obtained from the 5 h measurement during the peaks on 15th and 16th March, indicating that radioactive plume passed through Tsukuba City at that time. After the peaks, a dose rate increase with rainfall was observed on 21th March, dominating the integral dose rate measured at Tsukuba City. The dose after the rainfall comes from I-131, Cs-134, and Cs-137 that can be observed as peaks in the spectra.","PeriodicalId":121793,"journal":{"name":"Insights Concerning the Fukushima Daiichi Nuclear Accident Vol. 4","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129358973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}