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Usuda, Shigekazu; Shinohara, Nobuo; Sakurai, Satoshi; Magara, Masaaki; Miyamoto, Yutaka; Esaka, Fumitaka; Yasuda, Kenichiro; Kokubu, Yoko; Hirayama, Fumio; Lee, C. G.; et al.
KEK Proceedings 2007-16, p.13 - 22, 2008/02
For the purpose of controlling and monitoring radiations and radioactive materials emitted from nuclear facilities to the environment and also evaluating their effects, various R&D on environmental radioactivity has been carried out at Japan Atomic Energy Agency (JAEA). Especially, for the abolition of nuclear weapons and for peaceful uses nuclear energy, ultra-trace analysis of environmental samples for safeguards and ultra-high sensitive monitoring of radionuclides for the CTBT verification, which have been scheduled in the middle of 1990s, have been promotted under the auspices of the Japanese Government at JAERI, the former of JAEA. In this presentation, the outline of R&D on environmental radioactivity for nuclear non-proliferation is introduced. In addition, applications of the developed techniques and future perspectives will be discussed.
Shinohara, Nobuo; Asano, Yoshie; Hirota, Naoki*; Hokida, Takanori; Inoue, Yoji; Kumata, Masahiro; Nakahara, Yoshinori*; Oda, Tetsuzo*; Uchikoshi, Takako*; Yamamoto, Yoichi
Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 3 Pages, 2005/10
Research activities of JAERI related to the CTBT verification regime are presented in the International Conference. The subjects of this presentation are (1) an overview of the CTBT verification regime, (2) construction and operation of the radionuclide monitoring stations of Okinawa (RN37) and Takasaki (RN38) and the certified radionuclide laboratory (RL11), and (3) preparation of the National Data Center at Tokai (JAERI NDC) for radionuclide data. The RN38 station has been certified by the CTBTO/PrepCom and sending the measured data every day. The infrastructures and operational manuals for RN37 and RL11 are now preparing for their operations. The JAERI NDC has experimentally analyzed and evaluated the radionuclide data from all over the world through International Data Center (IDC). As an example of the JAERI NDC works, atmospheric dispersion backtracking system has been developing by using WSPEEDI (Worldwide Version of System for Prediction of Environmental Emergency Dose Information) code to estimate a source location of radionuclide release by nuclear explosion/accident.
Shinohara, Nobuo; Inoue, Yoji; Uchikoshi, Takako*; Oda, Tetsuzo*; Kumata, Masahiro; Kurosawa, Yoshiaki; Hirota, Naoki*; Hokida, Takanori; Nakahara, Yoshinori*; Yamamoto, Yoichi
Dai-25-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, p.51 - 58, 2005/00
The Japan Atomic Energy Research Institute (JAERI) conducts researches and developments related to Comprehensive Nuclear-Test-Ban Treaty (CTBT) on the basis of Japan's pragmatic and progressive efforts toward peaceful use of atomic energy and non-proliferation with the goal of realizing a peaceful and safe world free from nuclear weapons. The Treaty aims for the establishment of a global verification regime comprising an International Monitoring System (IMS) and the JAERI has engaged in the following activities: construction and operation of the radionuclide monitoring stations at Okinawa (RN37) and Takasaki (RN38) and the certified radionuclide laboratory at Tokai (RL11) as specified in Annex 1 of CTBT Protocol, and preparation of the National Data Center at Tokai (JAERI NDC). Research activities of JAERI related to the CTBT verification regime are presented in the paper. The subjects of this presentation are (1) an overview of the CTBT verification regime, (2) construction and operation of RN37, RN38 and RL11, and (3) preparation of the JAERI NDC for radionuclide data.
Hirota, Naoki*; Hokida, Takanori; Inoue, Yoji; Kumata, Masahiro; Kurosawa, Yoshiaki; Miyamoto, Yutaka; Nakahara, Yoshinori; Oda, Tetsuzo; Shinohara, Nobuo; Uchikoshi, Takako*; et al.
JAERI-Review 2003-021, 68 Pages, 2003/08
JAERI-Review-2003-021.pdf:9.73MB
This report describes research activities of the R & D Group for Non-Proliferation Technology related to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) verification regime. The main subjects of this report are (1) an overview of the CTBT verification regime, (2) preparation of the National Data Center for radionuclide data, (3) construction and operation of the radionuclide monitoring stations at Takasaki and Okinawa and the certified rarionuclide laboratory at Tokai in Japan. We have participated in an intercomparison test internationally organized for the certified laboratories and the test results are given here. Scientific application of the CTBT-related technologies to environmental researches is also depicted.
Shinohara, Nobuo; Yamamoto, Yoichi; Inoue, Yoji; Kumata, Masahiro; Oda, Tetsuzo; Uchikoshi, Takako*; Hokida, Takanori; Hirota, Naoki*; Nakahara, Yoshinori; Usuda, Shigekazu
Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, p.45 - 52, 2002/12
no abstracts in English
Yamamoto, Yoichi; Hokida, Takanori; Hirota, Naoki*; Oda, Tetsuzo; Nakahara, Yoshinori; Kumata, Masahiro; Inoue, Yoji; Uchikoshi, Takako*; Shinohara, Nobuo; Usuda, Shigekazu
Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, p.53 - 60, 2002/12
The Japan Atomic Energy Research Institute (JAERI) has developed the National Data Center (NDC) for radionuclide as part of the international monitoring regime related to the Comprehensive Nuclear-Test-Ban Treaty (CTBT). JAERI NDC already started to input gamma-ray spectrum data obtained from several International Monitoring System (IMS) stations into a database. Data analysis reports made by the International Data Center (IDC) are also stored in the database. Some software tools are under development for the NDC's independent analysis such as investigation of existence of the radionuclides derived from nuclear explosion and presumptive analysis of source location of radionuclide release. The NDC system will also be able to post IMS data and analysis results to the authorized users on the Internet. This paper presents the role, current state of system development and future plan of JAERI NDC.
Kumata, Masahiro; Oda, Tetsuzo; Miyamoto, Yutaka; Uchikoshi, Takako*; Nakahara, Yoshinori; Yamamoto, Yoichi; Hokida, Takanori; Hirota, Naoki*; Inoue, Yoji; Shinohara, Nobuo
Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, p.39 - 44, 2002/12
The International Monitoring System (IMS) will be established across the world to verify compliance with the Comprehensive Test Ban Treaty (CTBT). The IMS will be capable of detecting and identifying nuclear explosions of detonated within the atmosphere, underwater and underground. 321 monitoring stations will be set around the world as a monitoring network of the IMS. The four technologies of seismology, hydroacoustic, infrasound, and radionuclide will be used for monitoring purposes. In order to build the radionuclide monitoring network, 80 radionuclide stations were chosen. Particles in the atmosphere are collected on a filter at each station to measure radioactivity by a HP-Ge detector. Further, 40 out of these 80 stations will be equipped with an automatic radioactive noble gas sampler/analyzer. The JAERI is establishing infrastructure to host radionuclide air monitoring equipment for two raionuclide stations in Japan. This paper presents the current status of the establishment and promising performance of the stations in Japan.
Oda, Tetsuzo; Kumata, Masahiro; Nakahara, Yoshinori; Yamamoto, Yoichi; Hokida, Takanori; Hirota, Naoki*; Uchikoshi, Takako*; Inoue, Yoji; Shinohara, Nobuo
Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, p.29 - 37, 2002/12
The Comprehensive nuclear Test-Ban Treaty(CTBT) bans all nuclear explosions and also calls for a verification regime, which consists of the International Monitoring System(IMS) and On-site Inspection. The primary objectives of the IMS are to deter nuclear explosions in all environments and, if such an explosion does occur, to detect, locate, and identify its source. The CTBT was opened for signature on September 24, 1996 and the Preparatory Commission(PrepCom) for the CTBT Organization was established to prepare for the verification regime in order to monitor compliance with the Treaty. The Preparatory Commission comprises two main organs: a plenary body of all the States Signatories as the highest policy-making organ, and the Provisional Technical Secretariat(PTS). The plenary body has three subsidiary bodies: Working Group A(administrative matters and legal issues), Working Group B(verification issues), and an Advisory Group. This paper presents an overview and mandate of the PrepCom, and status of verification regime, and discusses future activities.
Kumata, Masahiro; Mukai, Masayuki; Iwamoto, Hiroshi*
JAERI-Conf 2001-015, p.80 - 81, 2001/12
Based on the groundwater scenario, prediction of the transport of radionuclides from waste disposal facilities requires an understanding of deep groundwater flow system. Capabilities offering by isotope techniques using environmental tracer enable one to estimate past and present behavior of groundwater system, and therefore establish a basis for future predictions. A study area was selected in Japan and hydrogeological study has been performed. On the other hand, fractures in the hard rock mass play an important role on groundwater flow at the depth. Basic study was performed for resistivity tomography, one of the useful techniques for the evaluation of rock fractures.
Ogawa, Hiromichi; Nagao, Seiya; Yamaguchi, Tetsuji; Mukai, Masayuki; Munakata, Masahiro; Sakamoto, Yoshiaki; Nakayama, Shinichi; Takeda, Seiji; Kimura, Hideo; Kumata, Masahiro; et al.
JAERI-Research 2000-052, 101 Pages, 2001/01
JAERI-Research-2000-052.pdf:8.27MB
no abstracts in English
Kumata, Masahiro; Nakayama, Shinichi; Vandergraaf, T. T.*; Drew, D. J.*
JAERI-Conf 99-004, p.395 - 410, 1999/03
no abstracts in English
Kumata, Masahiro; Vandergraaf, T. T.*
Journal of Contaminant Hydrology, 35(1-3), p.31 - 40, 1998/00
Times Cited Count：6 Percentile：23.71(Environmental Sciences)no abstracts in English
; Kumata, Masahiro; ;
Doboku Gakkai Dai-50-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu, 0, p.64 - 65, 1995/00
no abstracts in English
Kumata, Masahiro;
JAERI-Tech 94-032, 53 Pages, 1994/11
no abstracts in English
Kumata, Masahiro; ; ;
Butsuri Tansa Gakkai Dai-91-Kai (Heisei-6-Nendo Shuki) Gakujutsu Koenkai Koen Rombunshu, 0, p.298 - 300, 1994/10
no abstracts in English
; Kumata, Masahiro
Butsuri Tansa, 47(3), p.161 - 172, 1994/00
no abstracts in English
Kumata, Masahiro; T.T.Vandergraaf*
Hoshasei Haikibutsu Kenkyu Renrakukai Rombunshu (VI), 10 Pages, 1991/06
no abstracts in English
15, 1991, Mito City, Japan; Ogawa, Hiromichi; Kumata, Masahiro; Amano, Hikaru
Journal of Nuclear Science and Technology, 28(6), p.589 - 592, 1991/06
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)no abstracts in English
Kumata, Masahiro;
Radioisotopes, 40(6), p.240 - 243, 1991/06
no abstracts in English
Kumata, Masahiro;
Hoken Butsuri, 26, p.59 - 61, 1991/00
no abstracts in English
