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Journal Articles

Preliminary re-conditioning test of the bituminization for radioactive wastes

Soejima, Goro; Takiya, Hiroaki; Mizui, Hiroyuki; Fujita, Yoshihiko*; Akari, Eisaku*; Endo, Nobuyuki*; Kume, Kyo*

Heisei-27-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 18, P. 14, 2016/10

We have performed the preliminary re-conditioning test of the bituminization for radioactive wastes applying to the technical criteria by non-radioactive samples. As a result, we have confirmed the applicability to secure homogeneity that is a part of the technical criteria by evaluating sample properties.

Journal Articles

Summary of ICRP Symposium on Radiological Protection Dosimetry

Endo, Akira; Hamada, Nobuyuki*

Isotope News, (745), p.42 - 43, 2016/06

ICRP Symposium on Radiological Protection Dosimetry was held in Hongo campus, the University of Tokyo on February 18, 2016. Committee 2 of the International Commission on Radiological Protection (ICRP) is engaged in the development of dose coefficients for the assessment of internal and external radiation exposures; development of reference biokinetic and dosimetric models, and reference data for workers and members of the public. The symposium aimed at reviewing the current work of ICRP and discussing research needed for the ICRP System of radiological protection dosimetry. This article reviews the presentations and discussion in the symposium.

Journal Articles

Review on conformance to technical criteria for near surface disposal

Tezuka, Masashi; Koda, Yuya; Fujita, Yoshihiko*; Endo, Nobuyuki*; Kume, Kyo*

Heisei-26-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 17, P. 78, 2015/10

In FUGEN, asphalt solidified body which was solidified the concentrated liquid waste is, some of them might also be present which do not meet the criteria (buried technical standards) according to the buried disposal of waste Therefore, these can not be buried disposal remain status quo. Therefore, it is assumed that that may not conform to the above criteria, "Asphalt solid material" is to conform to the reference to "re-processing", in addition to the desk study on specific measures, and also to preliminary tests I went.

Journal Articles

Sodium experiments on natural circulation decay heat removal and 3D simulation of plenum thermal hydraulics

Kamide, Hideki; Ono, Ayako; Kimura, Nobuyuki; Endo, Junji*; Watanabe, Osamu*

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Safe Technologies and Sustainable Scenarios (FR-13), Companion CD (CD-ROM), 11 Pages, 2015/04

Natural circulation decay heat removal is one of the significant issues for fast reactor safety, especially in long term station blackout events. Several sodium experiments were carried out using a 7-subassmbly core model for core thermal hydraulics under natural circulation conditions and for onset transients of natural circulation in a decay heat removal system (DHRS) including natural draft. Significant heat removal via inter-wrapper flow was confirmed in the experiments. Solidification of sodium in an air cooler is one of key issues in loss of heat sink events. Natural circulation characteristics under long-term decay heat removal were also obtained. Multi-dimensional phenomena, e.g., thermal stratification and bypass flow in plenums and/or heat exchangers, may influence the natural circulation. Thus, 3D simulation method was developed for entire region in the primary loop. Comparison of temperature distributions in a DHRS heat exchanger between experiment and analysis was done.

JAEA Reports

The Uranium waste fluid processing examination by liquid and liquid extraction method using the emulsion flow method

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.

Journal Articles

Analytical surveillance on production methods of homogeneous and uniform solid materials from spent ion exchange residuum after ion coupled plasma volume-reduction process

Otani, Hiroshi; Mizui, Hiroyuki; Higashiura, Norikazu; Bando, Fumio*; Endo, Nobuyuki*; Yamagishi, Ryuichiro*; Kume, Kyo*

Heisei-25-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 16, P. 66, 2014/10

no abstracts in English

Journal Articles

Continuous extraction of uranium from actual uranium-containing liquid wastes using an "emulsion flow" extractor

Nagano, Tetsushi; Yanase, Nobuyuki; Naganawa, Hirochika; Mitamura, Hisayoshi; Hanzawa, Yukiko; Mita, Yutaka; Kanda, Nobuhiro; Ohashi, Yusuke; Endo, Yuji; Matsubara, Tatsuo

Nippon Genshiryoku Gakkai Wabun Rombunshi, 12(4), p.277 - 285, 2013/12

no abstracts in English

Journal Articles

Analytical surveillance of the nuclear waste package processing of the spent ion-exchange resin residual

Otani, Hiroshi; Bando, Fumio*; Endo, Nobuyuki*

Heisei-24-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 15, P. 89, 2013/10

no abstracts in English

Journal Articles

Analytical surveillance of the nuclear waste package processing of the spent ion-exchange resin residuals

Minehara, Eisuke*; Endo, Nobuyuki*

Heisei-23-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 14, P. 49, 2012/10

no abstracts in English

Journal Articles

Behavior data acquisition and research of the cutting dust by laser cutting method in the air for decommissioning of Fugen Decommissioning Engineering Center

Shigeta, Tatsuo*; Sasase, Masato*; Endo, Nobuyuki*; Nagatomo, Jinro*

Heisei-22-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 13, P. 73, 2011/10

no abstracts in English

Journal Articles

Behavior data acquisition and research of the cutting dust by the mechanical and thermal cutting method for decommissioning of Fugen Decommissioning Engineering Center

Shigeta, Tatsuo*; Amada, Kenichi*; Sasase, Masato*; Endo, Nobuyuki*; Nagatomo, Jinro*

Heisei-21-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 12, P. 78, 2010/10

no abstracts in English

Journal Articles

Study of the cutting dust reduction method for decommissioning of Fugen nuclear power station

Shigeta, Tatsuo*; Amada, Kenichi*; Sasase, Masato*; Endo, Nobuyuki*; Nagatomo, Jinro*

Heisei-20-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Kenkyu Seika Hokokushu, 11, P. 87, 2009/11

no abstracts in English

Journal Articles

Study of the cutting dust reduction method for decommissioning of Fugen

Shigeta, Tatsuo*; Yasu, Takami*; Endo, Nobuyuki*; Nagatomo, Jinro*

Wakasawan Enerugi Kenkyu Senta 10-Shunen Kinen-Shi, P. 126, 2008/11

no abstracts in English

Journal Articles

Calculation of dose contributions of electron and charged heavy particles inside phantoms irradiated by monoenergetic neutron

Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Omachi, Yasushi*; Miyahara, Nobuyuki*

Journal of Radiation Research, 49(5), p.503 - 508, 2008/09

 Times Cited Count:7 Percentile:69.24(Biology)

The radiation-transport code PHITS with an event generator mode has been applied to analyze energy depositions of electron and charged heavy particles in two spherical phantoms and a voxel-based mouse phantom upon neutron irradiation. The calculations using the spherical phantoms quantitatively clarified the type and energy of charged particles which are released through interactions of neutrons with the phantom elements and contribute to the radiation dose. The relative contribution of electrons increased with increase in the size of the phantom and with decrease in the energy of the incident neutrons. Calculation with the voxel-based mouse phantom given 2.0-MeV neutron irradiation revealed that the doses to different locations inside the body are uniform, and that the energy is mainly deposited by recoil protons. The present study has demonstrated that analysis using PHITS can yield dose distributions that are accurate enough for RBE evaluation.

Journal Articles

Study of the cutting dust reduction method for decommissioning of Fugen nuclear power station

Shigeta, Tatsuo*; Yasu, Takami*; Endo, Nobuyuki*; Nagatomo, Jinro*

Heisei-18-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Kenkyu Seika Hokokushu, 9, P. 84, 2007/09

no abstracts in English

Journal Articles

Research on measurement technique of integration dosimeter

Takagi, Keiichi*; Tanaka, Yoshikazu*; Hatashita, Masanori*; Endo, Nobuyuki*

Heisei-18-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Kenkyu Seika Hokokushu, 9, P. 95, 2007/09

no abstracts in English

Journal Articles

Absolute measurements of He in metals using chemical treatments

Ito, Yoshifumi*; Batchuluun, C.*; Yasuda, Keisuke*; Ishigami, Ryoya*; Endo, Nobuyuki*

Heisei-18-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Kenkyu Seika Hokokushu, 9, p.27 - 30, 2007/09

GC/MS (Gas Chromatography/Mass Spectrometer) with the help of Chemical treatments has been applied to measure amount of helium (He) atoms in metals. Metal samples of cupper (Cu) contained He atoms were prepared using a 200kV ion implantation machine. The samples were solved in 0.5cc volume of 20% nitric acid in a H type reaction tube filled with nitrogen gases at 1 atmospheric pressure and He atoms in Cu metal were exhausted completely into the nitrogen gases. He analysis using GC/MS reveals that the metals contained 10$$^{16}$$ to 10$$^{17}$$ atoms of He. The He signal intensity and He ions implanted to the metals revealed good proportional relation.

Journal Articles

Microdosimetric study for secondary neutrons in phantom produced by a 290 MeV/nucleon carbon beam

Endo, Satoru*; Tanaka, Kenichi*; Takada, Masashi*; Onizuka, Yoshihiko*; Miyahara, Nobuyuki*; Sato, Tatsuhiko; Ishikawa, Masayoshi*; Maeda, Naoko*; Hayabuchi, Naofumi*; Shizuma, Kiyoshi*; et al.

Medical Physics, 34(9), p.3571 - 3578, 2007/09

 Times Cited Count:7 Percentile:71.57(Radiology, Nuclear Medicine & Medical Imaging)

Absorbed doses from main charged particle beams and charged-particle fragments have been measured with high accuracy for particle therapy but there are few reports for doses from neutron components produced as fragments. This study describes measurements on neutron dose produced by carbon beam, microdosimetric distributions of secondary neutrons produced by 290 MeV/nucleon carbon beams have been measured by using a tissue equivalent proportional counter (TEPC) at the Heavy Ion Medical Accelerator in Chiba (HIMAC) at the National Institute of Radiological Sciences (NIRS). The ratios of neutrons to charged particle fragments dominated to be 11 to 89 % in the absorbed doses at the side and below the faces of the acrylic phantom (300 mm height $$times$$ 300 mm width $$times$$ 253 mm thickness).

Journal Articles

Simulation analysis of radiation fields inside phantoms for neutron irradiation

Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Omachi, Yasushi*; Miyahara, Nobuyuki*

JAEA-Conf 2007-002, p.59 - 65, 2007/02

The present study intends to analyze internal radiation field of a typical mouse with voxel phantom and radiation transport code. A mouse was imaged by using the dedicated small-animal CT scanner, in which slice pitch was set at 0.1 mm. Each image with the resolution of 0.02 mm was segmented to construct a voxel phantom by using computer tools, which have been applied to process human-head images for 3-dimensional dosimetry in BNCT treatment at the Japan Atomic Energy Agency. Input files for particle and heavy ion transport code system were prepared from the constructed 3-dimensional voxel-based image data. Absorbed dose distributions and LET spectra in the mouse body were calculated by PHITS on the segmented images.

Journal Articles

Application of electron spin resonance technique for high-dose $$gamma$$ dosimetry

Endo, Nobuyuki*

Wakasawan Enerugi Kenkyu Senta Dai-7-Kai Kenkyu Hokokukai Yokoshu, p.9 - 12, 2006/02

This report is experiments directed toward to establish the tool for quantitative radiation analysis using the electron spin resonance (ESR) technique. As basis research, stable free-radicals generated in calcium salt or cement powder by high dose $$gamma$$-ray irradiation were measured with ESR equipment. Stable free-radicals generated in the several samples by $$gamma$$-ray irradiation. Their sigmnal behaviour was experimentally investigated as a function of dose with $$gamma$$ rays. The stability of the ESR signal of the free radical after irradiation was investigated.

33 (Records 1-20 displayed on this page)