Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kanda, Nobuhiro; Daiten, Masaki; Endo, Yuji; Yoshida, Hideaki; Mita, Yutaka; Naganawa, Hirochika; Nagano, Tetsushi; Yanase, Nobuyuki
JAEA-Technology 2015-007, 43 Pages, 2015/03
JAEA-Technology-2015-007.pdf:5.33MB
The centrifuge which has the subtlety information concerning the nuclear nonproliferation used for uranium enrichment technical development exists in the uranium enrichment facilities of Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency. This centrifugal is performing separation processing of the radioactive material adhering to the surface of parts by wet decontamination of ultrasonic cleaning by dilute sulfuric acid and water, etc. By removing the uranium contained in waste fluid, generated sludge reduces activity concentration. And the possibility of reduction of sludge processing is examined. For this reason, from the 2007 fiscal year, Nuclear Science and Engineering Directorate and cooperation are aimed at, and development of the extraction separation technology of the "uranium" by the emulsion flow method is furthered. The test equipment using the developed emulsion flow method was tested. And dilute sulfuric acid and water were used for the examination as actual waste fluid. The result checked whether the various performances in Basic test carried out in Nuclear Science and Engineering Directorate would be obtained.
Saegusa, Jun; Kurikami, Hiroshi; Yasuda, Ryo; Kurihara, Kazuo; Arai, Shigeki; Kuroki, Ryota; Matsuhashi, Shimpei; Ozawa, Takashi; Goto, Hiroaki; Takano, Takao; et al.
Health Physics, 104(3), p.243 - 250, 2013/03
Times Cited Count：3 Percentile：25.59(Environmental Sciences)After the Nuclear accident on March 2011, water discharge from many outdoor swimming pools in the Fukushima prefecture was suspended out of concern that radiocesium in the pool water would flow into farmlands. We have reviewed the existing flocculation method for decontaminating pool water and established a practical decontamination method by demonstrating the process at several pools in the Fukushima prefecture.
Nagano, Tetsushi; Mitamura, Hisayoshi; Yanase, Nobuyuki; Naganawa, Hirochika; Yasuda, Kenichiro; Yoshida, Zenko; Yamaguchi, Hiroaki*
Nihon Hoshasen Anzen Kanri Gakkai-Shi, 11(2), p.139 - 145, 2012/11
An on-site monitoring method for radioactive cesium concentration in water using a cesium adsorption disk and a GM survey meter has been developed to rapidly and easily ascertain whether the water quality meets standards on radiological contaminants in water. In this method, both dissolved and suspended forms of radioactive cesium are collected on the cesium adsorption disk by means of filtration of a water sample. Beta counting rate of the disk is converted into radioactivity using a conservative calibration factor obtained here. The present on-site method was applied to monitoring of decontaminated water of an outdoor school swimming pool in Date city after Fukushima Dai-ichi Nuclear Power Plant accident.
Naganawa, Hirochika; Kumazawa, Noriyuki*; Saito, Hiroshi*; Yanase, Nobuyuki; Mitamura, Hisayoshi; Nagano, Tetsushi; Kashima, Kaoru*; Fukuda, Tatsuya*; Yoshida, Zenko; Tanaka, Shunichi*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 10(4), p.227 - 234, 2011/12
no abstracts in English
SR study of organic antiferromagnet 
'-(BEDT-TTF)
ICl under high pressureSato, Kazuhiko*; Sato, Koichi*; Yoshida, Tetsushige*; Taniguchi, Hiromi*; Goko, Tatsuro*; Ito, Takashi; Oishi, Kazuki*; Higemoto, Wataru
Physica B; Condensed Matter, 404(5-7), p.600 - 602, 2009/04
Times Cited Count：3 Percentile：16.75(Physics, Condensed Matter)Zero-field muon spin relaxation was measured for organic antiferromagnet '-(BEDT-TTF)ICl under high pressure of up to 1.37 GPa. Neel temperature, which is 22 K at ambient pressure, increases with increasing pressure and becomes approximately 48 K at 1.37 GPa. Muon precession frequency at 1.37 GPa, becomes about 5 times larger than that at ambient pressure.
Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Iijima, Akihiko*; Yoshida, Takahiro*; Usami, Takahiro*; Hida, Tetsushi*
Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.819 - 821, 2006/00
JAEA and KEK have started acceleration of radioactive nuclear beam (RNB) and stable ion beam (SNB) from TRIAC. RNB and SNB are accelerated by SCRFQ and IH linac up to the energy of 1.1MeV/u. We were planning to re-accelerate the beams in the future by superconducting booster up to an energy of 5
8MeV/u. In order to inject the beams into superconducting booster, we need a pre-booster which is capable of acceleration from 1.1MeV/u to 2.0MeV/u. We have started development of superconducting twin quarter wave resonator (twin-QWR) in FY2004, and have fabricated a prototype twin-QWR in FY2005.
Fukahori, Tokio; Kunieda, Satoshi; Chiba, Satoshi; Harada, Hideo; Nakashima, Hiroshi; Mori, Takamasa; Shimakawa, Satoshi; Maekawa, Fujio; Watanabe, Yukinobu*; Shigyo, Nobuhiro*; et al.
no journal, ,
The latest version of JENDL High Energy File (JENDL/HE) and JENDL Photonuclear Data File (JENDL/PD) is being planed to be released as JENDL/HE-2007 and JENDL/PD-2007. In JENDL/HE-2007, nuclear data for about 100 nuclides, which are newly ecaluated and revised from JENDL/HE-2004 will be stored. The JENDL/PD-2007 will have nuclear data for about 170 nuclides.
Nagasu, Ryosuke*; Yoshida, Masafuyu*; Naganawa, Hirochika; Yanase, Nobuyuki; Nagano, Tetsushi; Mitamura, Hisayoshi; Komatsuzaki, Shoichi*; Kumazawa, Noriyuki*
no journal, ,
A new method for easily removing of radioactive cesium from muck soil in forests has been developed. Fine particles of bentonite having negative charge and high adsorbing ability for cesium can effectively adsorb radioactive cesium, and then, the bentonite fine particles can aggregate and being trapped by interaction with interpolyelectrolyte complex having positive charge, which enables an easy removal of radioactive cesium from muck soil in forests.
Yoshida, Hiroko*; Hayashi, Masateru*; Makita, Taisuke*; Azuma, Tetsushi*; Sasano, Makoto*; Tsuda, Shuichi
no journal, ,
Investigation on distribution of radioactive substances in Fukushima within former evacuation areas has been ongoing since 2012. Reduction rates of air dose rate indoor and outdoor were compared for 54 residential houses in Iidate-mura and Minami-Soma. Just after the decontamination, the averaged value of the outdoor reduction rates was higher than those indoor, while the averaged outdoor reduction rate in 2019 and 2020 was almost identical to the indoor one within uncertainties. This means that indoor air dose rate has decreased less than outdoors. One of the reasons would be the existence of additional radionuclides coming from outside of the decontamination area around the houses, according to spectra analyses of air dose measurement and deposition of radionuclides on the roof.
Hayashi, Masateru*; Makita, Taisuke*; Azuma, Tetsushi*; Sasano, Makoto*; Yoshida, Hiroko*; Tsuda, Shuichi
no journal, ,
Evaluation of dose rates of artificial nuclides is of importance to make a decision on return of residents to their hometown contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident. This study applies an unfolding method to measured data by a NaI(Tl) detector in/outside houses, and obtained gamma-ray energy spectra. We calculated ratios of dose rate from natural nuclides such as 40K and Uran-Thorium series to those of artificial nuclides. It was found that the ratios are almost constant, given that no artificial nuclide exists. This means a possibility that dose rates of artificial nuclides can be precisely estimated by subtracting dose rates of natural nuclides.
