Publications & Presentations

2020

Date Apr. 2020
Presenter H. KATOH(JNK) and others
Title Differences in activities of two antioxidative enzymes,superoxide dismutase and catalase, in gills and red blood cells of yellowtail, red sea bream and Japanese flounder, as a possible cause of different tolerances to Chattonella marina blooms
Outline This study aimed to investigate the different susceptibility to a harmful microalga, Chattonella marina, between the yellowtail, Seriola quinqueradiata (YT), the red sea bream, Pagrus major (RSB), and the Japanese flounder, Paralichthys olivaceus (JF) by comparing activities of superoxide dismutase (SOD) and catalase in the gills and the red blood cells.
Journal Aquaculture Science(APR 2020)Vol.68-1
Date Feb. 2020
Presenter K. Usami(JANUS) and others
Title Variations in sediment lithology of submarine flood deposits on the slope off Kumano River, Japan
Outline Major river flood is a typical geohazard frequently characterized by the transportation of large quantities of terrigenous material from the land to the sea. However, the types and patterns of flood material deposition and the influence on sea floor environments differ because of the diversity in geological and climatic conditions. In September 2011, the activity of typhoon 201112 produced severe rainfall in the central Kii Peninsula and caused a large flood along the Kumano River. The event was considered a once-in-a-century scale flood. We examined the occurrence of flood deposits along the slope off the mouth of Kumano River in four surface sediment cores collected around two months after the 2011 flood. We found a thin and muddy event bed at the core top of three cores, with two or three event beds corresponding to past historical flood events. The sediment thickness, grain size, and sedimentary structures for three historical flood deposits demonstrated significant variation. The thicknesses and the grain sizes of three flood deposits from the same river show no relationship with the maximum discharge from each flood. The differences in the types and fate of sediments discharge during the floods probably account for the variations.
Journal The Geological Society, London
https://doi.org/10.1144/SP501-2019-53

2019

Date Jun. 2019
Presenter A. Takamasa(JANUS) and H. Toma(JANUS) and others
Title Insights to the UK's impending departure from Euratom: Case study of UK nuclear safeguards and radiation protection in light of Brexit
Outline One of the first pieces of legislation addressing the UK's departure from the EU/Euratom to complete its passage through Parliament is the Nuclear Safeguards Act 2018, which will enable the government to establish a domestic nuclear safeguards regime. This was driven by the need to prevent vulnerability to a vital energy system and indicates the short to medium term approach the UK has to its policymaking post-Brexit: dealing with issues immediately impacted, such as ensuring the continued supply of nuclear fuel. The contribution of this paper is the examination of two particular areas under the responsibility of Euratom – nuclear safeguards and radiation protection – that are presented to indicate the wider impact Brexit has in other areas currently the responsibility of the EU, for example, chemical safety. It shows that the UK has significant gaps in responsibility currently undertaken by Euratom (or other EU institutions) that need to be filled by UK bodies. Which bodies will assume these responsibilities and what resources will be available remain open questions. This case study highlights the need for systematic prioritisation by the UK government when filling the void of EU/Euratom institutions.
Journal Energy Policy Volume 129, June 2019, Pages 1416-1422
Date May 2019
Presenter M. Kitagawa(JANUS)
Title Environmental Impact Assessment for Offshore Oil and Gas Projects
Outline This presentation will deliver the result of analysis of assessment methods, specific environmental impacts actually assessed in Environmental Impact Assessment Reports for oil and gas development made in advanced countries.
Conference IAIA19 Brisbane Australia
Date Mar. 2019
Author Y. Ohkubo
Title Operation Period in overseas nuclear power plant
Journal Monthly ENERGY FORUM
Date Mar. 2019
Presenter Y. Fukaya, S. Sun, K. Ichikawa, T. Sugiyama (JANUS)
S. Uchida, K. Tagami (QST-NIRS)
T. Kato(JAEA)
Title Tracking survey of transport parameters used for exposure assessment related to radioactive waste disposal etc. 1: Feed - animal products transfer coefficient
Conference The 20th Workshop on Environmental Radioactivity
Date Feb. 2019
Presenter S. Kobayashi(JANUS), I. Katsuyama(JANUS) and others
Title Designing a laboratory bioassay for evaluating the efficacy of antifouling paints on Balanus amphitrite using a flow-through system
Outline With the aim of establishing a protocol for evaluating the efficacy of antifouling paints, a flow-through laboratory test using triangular prisms was developed for cyprids of the barnacle Balanus amphitrite.
Journal MDPI(Multidisciplinary Digital Publishing Institute)
Date Feb. 2019
Presenter I. Katsuyama(JANUS) , Y. Sadamichi(JANUS)
Title Biofouling and its Solutions for Seawater-Related Facilities in Power Plants
Outline Biofouling management is essential in the aspect of plant economics and reliable operation in power plants where seawater is used for cooling system. However, it is not easily achieved in most of the plants due to its complexity. This presentation gives clear explanation of creatures that cause biofouling and their variety of countermeasures.
Conference 2018 Technical Seminar of Thermal and Nuclear Power Engineering Society

2018

Date Dec. 2018
Author Y. KAWASHIMA
Title Reliablity assessment of papers on Endocrine disruptors in the EXTEND2016 of MoE, Japan.
Outline Janus is acting as a secretariat of EXTEND2016 which is the main programme on endocrine disruptors. Informing the key art of reliability assessment of papers to younger researchers.
Journal News Letter, Vol.21, No.3, Japan Society of Endocrine Disrupter Research
Date Nov. 2018
Presenter Y. MATSUNAGA(JANUS)
Title Back ground and cause of differences between “science and technology communication” and “risk communication”
Conference The Society for Risk Analysis Japan
Date Oct. 2018
Presenter K. ITO(JANUS) , N.TERAURA(errara Code Research Institute)
Title Effective Utilization of Radiation Resistant RF Tag in the Decommissioning Work Management
Outline We discuss the effective utilization of radiation resistant RF tags for radioactive waste management during the decommissioning works. Our tag can prevent the corruption of the data stored in RF tag memory due to radiation damage.
Journal The fourth International Conference on Maintenance Science and Technology (ICMST 2018)
Date Sep. 2018
Presenter S. Sun1,2, Y. Nogami1, T. Sugiyama1 and T. Iimoto2
1 JANUS
2 The University of Tokyo
Title Discussion on NORM Management under Japanese Situation Based on Graded Approach
Conference 9th International Conference on High Level Environmental Radiation Areas - For Understanding Chronic Low-Dose-Rate Radiation Exposure Health Effects and Social Impacts (ICHLERA 2018)
Date Aug. 2018
Author K. Ishida, S. Iwai, T. Senba (JANSI) , H. Toma (JANUS)
Title Mechanisms of thyroid carcinogenesis
Journal Atomic Energy Society of Japan
Date Jul. 2018
Author M. KOBAYASHI (National Maritime Research Institute), Y. NIWA (National Maritime Research Institute), J. FUKUTO (National Maritime Research Institute), K. IWASAKI (JANUS)
Title Detection of ships and recognition of ship types from images using deep learning
Outline Development of a system for detection of ships and recognition of ship types from images using deep learning.
Journal KANRIN 79 2018/7
Date Jun 2018
Presenter M. Kitagawa(JANUS)
Title Environmental Impact Assessment for Offshore Oil and Gas Developments
Outline This presentation will deliver the result of analysis of assessment methods, impacts actually assessed and management measures described in Environmental Impact Assessment Reports for oil and gas development made in advanced countries.
Conference International Ocean and Polar Engineering (ISOPE)
Date May 2018
Presenter M. Kitagawa(JANUS)
Title Environmental Impact Assessment for Offshore Oil and Gas Developments
Outline This presentation will deliver the result of analysis of assessment methods, impacts actually assessed and management measures described in Environmental Impact Assessment Reports for oil and gas development made in advanced countries.
Conference Oceans '18 MTS/IEEE Kobe/Techno-Ocean 2018
Date May 2018
Presenter H. Nagako (JANUS),T. Hideshige ・Y. Rei・S.Hiroya (Tokyo university of agriculture and technology), W. Yutaka ・ Tanaka Kosuke(Hokkaido university)
Title Global surveillance of plastic-derived contaminants and POPs in seabirds by using preen gland oil
Outline In order to survey plastic pollution of seabirds, we analyzed plastic additives (brominated flame retardants; PBDEs, DBDPE, TBB, BTBPE, HBCD, phthalates, UV absorbers; benzophenone and benzotriazole) and POPs (PCBs, DDTs, HCHs) in preen gland oil of seabirds. BDE209, DBDPE or phthalate were detected in 31% of individuals and they were suggested to be polluted by chemicals in ingested plastics.
Conference Japan society for environmental chemistry

2017

Date Nov. 2017
Presenter T. TANI, Y. MORIWAKE, R. YAMASE
Title Research and business development support for biotechnology process -from basic research to business development-
Conference Japan Management Association
Date Oct. 2017
Presenter Y. MATSUNAGA
Title Survey the changes of Risk Communication affected by the Great East Japan Earthquake.
Outline The promotion plan for Risk Communication” notes that when the Great East Japan Earthquake occurred, the community of science and technology could not communicate the public scientific knowledge and hadn’t communicated on the risks enough. Other side, risk communication has been done in some fields (ex. chemicals, foods, nuclear) even before the Great East Japan Earthquake. This is a result of a questionnaire filled out by whom have been engaged in risk communication before the Great East Japan Earthquake. Some lessons and problems showed in the survey and guessed as good suggestions for promoting and improving risk communication.
Conference The Society for Risk Analysis Japan
Date Sep. 2017
Author T. TANI
Title Untapped potential - Across Asia there are great opportunities for biofuels, but progress remains slow.
Outline JANUS's comments on the development and prospects of biofuels in Japan are cited in the article by Mr. Colin Ley, a journalist.
Journal biofuels international, 11(5), 20-21, 2017
Date Aug. 2017
Presenter R. NAKAMURA
Title Status on Environmental Qualification of Electrical Component in Foreign Country
Outline Demonstration that the electric equipment important to safety can perform the required function in harsh environment during/after design bases accident by the end of life is called “Environmental Qualification”. EQ is regulatory requirement and licensing bases in the US and many countries. In the US regulation, it is required to develop EQ program, EQ component list and to maintain EQ data and records. Also the US NRC has started the EQ program inspection as a first design bases assurance inspection from 2017. Maintenance has important contribution to maintain an effective EQ program.
Conference Japan Society of Maintenology
Date Aug. 2017
Author M. NASU, S. NAKAJIMA, M. KITAGAWA
Title Environmental Impact Assessment for Offshore Oil and Gas Developments
Outline To consider how to assess environmental impacts and what environmental measures to be taken for the future oil and gas developments in the deep water around Japan, EIA procedures and legal requirements for EIA of advanced eight countries were researched. In addition, EIA reports prepared in five countries were collected and their assessment methods and impacts to be assessed were analyzed.
Journal Journal of Japan Society for Impact Assessment
Date Jun. 2017
Presenter K. Seki
Title Distribution of veterinary antibiotics in Asian waters
Outline Antibiotics are widely used, not only for treating human infections, but also for treatment of livestock and in fish farms. In this study, we collected surface water samples from 129 sites in Asia and manure samples from 56 sites in Japan and measured concentrations of 26 antibiotics. The concentrations of antibiotics in livestock wastewaters were much higher than the concentrations of antibiotics in urban canals. The human populations in Asia are at risk of exposure to antibiotics and antimicrobial resistant bacteria (ARB), and thereby disseminating antimicrobial resistance genes (ARGs).
Conference The 26th Symposium on Environmental Chemistry
Date Mar. 2017
Presenter K. ITO
Title JSM Maintenance Semniar 2017, Regulations and Industry Standards on Maintenance in US Nuclear Power Plants
Conference Japan Society of Maintenology (JSM)

2016

Date Dec. 2016
Presenter R.Kojima, S.Kobayashi, C.G.P.Satuito, I.Katsuyama, H.Ando,Y.Seki, T.Senda
Title A method for evaluating the efficacy of antifouling paint using Mytilus galloprovincialis in the laboratory in a flow-through system
Outline A laboratory test with a flow-through system was designed and its potential application for testing antifouling paints of varying efficacies was investigated. Six different formulations of antifouling paints were prepared to have increasing contents (0 to 40 wt.%) of Cu2O, which is the most commonly used antifouling substance, and each formulation of paint was coated on one surface of a test plate. The test plates were aged for 45 days by rotating them at a speed of 10 knots inside a cylinder drum. A behavioral test was then conducted using five mussels (Mytilus galloprovincialis) that were pasted onto the coated surface of each aged test plate. The number of the byssus threads produced by each mussel generally decreased with increasing Cu2O content of the paint. The test was validated by comparing the laboratory results of efficacy with that from field experiments. The results were highly consistent with observations from the field experiment.
Journal PLOS ONE, Drcember 13 2016
Date Dec. 2016
Presenter S. Ueda, S. Hisamatsu, K. Nakata, T. Fukumaki, I. Yabe
Title Structural characteristics of the water current and halocline in brackish Lake Takahoko, Aomori.
Outline In order to elucidate characteristics of the water current and halocline in brackish Lake Takahoko, which has been partitioned by a levee with water gates at the center, in Aomori Prefecture, the salinity, current direction/velocity, wind direction/velocitya and water level were observed from July to November 2015.
Journal Advanced Marine Science and Technology Society
Date Oct. 2016
Author KATSUYAMA I.
Title International Academic Conference( ICMCF 2016 ) Participation Report
Outline 18th International congress on marine corrosion and fouling( ICMCF 2016 ) participation report.
Journal SESSILE ORGANISMS
Date Sep. 2016
Presenter OHWADA T.
Title Environmental Impact Assessment for nuclear power stations in Japan
Outline Introduction of Environmental Impact Assessment processes for nuclear power stations in Japan, and explanation of major issues in Environmental Impact Assessment for nuclear power stations
Conference Conference on the Prospects for Nuclear Power in the Asia Pacific Region
Date Jun. 2016
Presenter KOBAYASHI S. , MATUMURA T. , KATSUYAMA I.
Title A flow-through method of laboratory testing for the efficacy of antifouling paints using three types of fouling organisms: barnacle, mussel and green algae
Conference 18th International Congress on Marine Corrosion and Fouling – ICMCF 2016
Date May. 2016
Presenter NAGAKI M.
Title Current Situation regarding Nuclear Power in the U.S. and Europe -Trend of Change Learned from Abroad-
Outline As a current situation of nuclear power in the U.S. and Europe, the status of nuclear new build in these countries was discussed. Also discussed were the situation of decommissioning activities in the U.S. and anti-nuclear policy in Europe in response to accident at Fukushima.
Conference Japan Society of Maintenology, Subcommittee on International Activity
Date Apr. 2016
Presenter SUGAYA J.
Title Status of Nuclear Operations and EUCG data in Japan
Conference 2016 EUCG Spring Conference & Workshop
Date Apr. 2016
Presenter Gen Nakamura(Tokyo University of Marine Science and Technology), Ichiro Kadowaki(Tokyo University of Marine Science and Technology), Shouka Nagatsuka(Tokyo University of Marine Science and Technology), Ryotaro Hayashi(Tokyo University of Marine Science and Technology), Naohisa Kanda(JANUS), Mutsuo Goto(Institute of Cetacean Research), Luis A. Pastene(Institute of Cetacean Research), Hidehiro Kato(Tokyo University of Marine Science and Technology)
Title White Patch on the Fore-Flipper of Common Minke Whale, as a Potential Morphological Index to Identify Stocks
Outline Past studies have indicated that there are two different stocks (J and O stocks) in the North Pacific common minke whale Balaenoptera acutorostrata population. These two stocks differ from each other in certain characteristics, such as body size, conception dates, and genetics. However, till date, few studies have investigated differences in the external body appearance between the two stocks. Therefore, in the present study, we focused on the unique white patch on the flipper of this whale species to elucidate inter-stock differences. We used the animals collected from JARPNII research during 2012 and 2013; stock information was determined by microsatellite DNA analysis (n = 220). We focused on the morphological differences in the size and pattern of the white patch on the flipper of each whale. The length of the white patch along the anterior (ventral) margin of the flipper tends to be proportionally larger in O stock. The pattern of the boundary area of the white patch named as the “Grayish Accessary Layer (GAL)” was remarkably different between stocks. Within animals with “no GAL” type, 94% were J stock. Conversely, of animals with GAL expanding over the half the flipper width, 96% were O stock. We concluded from our study that there were clear morphological differences in the flipper color pattern between J and O stocks, which enable to apply widely to other individuals.
Journal Open Journal of Animal Sciences (SCIRP journals)
Date Apr. 2016
Presenter Gen Nakamura(Tokyo University of Marine Science and Technology), Ichiro Kadowaki(Tokyo University of Marine Science and Technology), Shouka Nagatsuka(Tokyo University of Marine Science and Technology), Ryotaro Hayashi(Tokyo University of Marine Science and Technology), Naohisa Kanda(JANUS), Mutsuo Goto(Institute of Cetacean Research), Luis A. Pastene(Institute of Cetacean Research), Hidehiro Kato(Tokyo University of Marine Science and Technology)
Title White Patch on the Fore-Flipper of Common Minke Whale, as a Potential Morphological Index to Identify Stocks
Outline Past studies have indicated that there are two different stocks (J and O stocks) in the North Pacific common minke whale Balaenoptera acutorostrata population. These two stocks differ from each other in certain characteristics, such as body size, conception dates, and genetics. However, till date, few studies have investigated differences in the external body appearance between the two stocks. Therefore, in the present study, we focused on the unique white patch on the flipper of this whale species to elucidate inter-stock differences. We used the animals collected from JARPNII research during 2012 and 2013; stock information was determined by microsatellite DNA analysis (n = 220). We focused on the morphological differences in the size and pattern of the white patch on the flipper of each whale. The length of the white patch along the anterior (ventral) margin of the flipper tends to be proportionally larger in O stock. The pattern of the boundary area of the white patch named as the “Grayish Accessary Layer (GAL)” was remarkably different between stocks. Within animals with “no GAL” type, 94% were J stock. Conversely, of animals with GAL expanding over the half the flipper width, 96% were O stock. We concluded from our study that there were clear morphological differences in the flipper color pattern between J and O stocks, which enable to apply widely to other individuals.
Journal Open Journal of Animal Sciences (SCIRP journals)

2015

Date Nov. 2015
Presenter KAWASHIMA Y.
Title Progress of EXTEND2010
Outline EXTEND2010 is developed by Ministry of the Environment, Japan as a new program for the next five years by maintaining the appropriate parts of ExTEND2005 (2005-2010) and adding necessary improvements.
It aims to properly assess the environmental risk of endocrine disrupting effects of chemicals and to take appropriate management measures.
The following three effects caused by endocrine disruption will be targeted, effects to reproduction - estrogen, anti-estrogen, androgen and anti-androgen, effects to development (such as metamorphosis) - thyroid hormone and effects to growth - ecdysone, juvenile hormone.
Framework for conducting ecotoxicity testing should be developed for ecological risk assessment caused by endocrine disruptors.
Following two actions/effects should be evaluated, identification of actions to endocrine system and characterization of adverse effects to organisms.

Progress of EXTEND2010 as of Sep. 2015.
Tier 1 in vitro assays (reporter gene assays) were conducted for 43 chemicals (117 assays) to see whether the suggested actions could be relevant to endocrine disruption.
The result shows that 24 chemicals were positive, 19 chemicals were negative.
Tier 1 in vivo assays (OECD TG229 Medaka) were conducted for 9 chemicals.
The result shows that estrogenic activity were detected in 5 chemicals, estrogenic activity were not detected in 2 chemicals, anti-estrogenic activity were not detected in 2 chemicals and adverse effects on reproduction were detected in 8 chemicals.
"Further Actions to Endocrine Disrupting Effects of Chemicals - EXTEND2010-"(July 2010)(EXTEND = Extended Tasks on Endocrine Disruption)
Conference The 63rd National Institute for Basic Biology Conference Environment to Bioresponse.
Date Nov. 2015
Presenter Werner Rühm, Gayle E. Woloschak, Roy E. Shore, Tamara V. Azizova, Bernd Grosche, Ohtsura Niwa, Suminori Akiba, Tetsuya Ono, Keiji Suzuki, Toshiyasu Iwasaki, Nobuhiko Ban, Michiaki Kai, Christopher H. Clement, Simon Bouffler, Hideki Toma(JANUS), Nobuyuki Hamada
Title Dose and dose-rate effects of ionizing radiation: a discussion in the light of radiological protection
Outline The biological effects on humans of low-dose and low-dose-rate exposures to ionizing radiation have always been of major interest. The most recent concept as suggested by the International Commission on Radiological Protection (ICRP) is to extrapolate existing epidemiological data at high doses and dose rates down to low doses and low dose rates relevant to radiological protection, using the so-called dose and dose-rate effectiveness factor (DDREF). The present paper summarizes what was presented and discussed by experts from ICRP and Japan at a dedicated workshop on this topic held in May 2015 in Kyoto, Japan. This paper describes the historical development of the DDREF concept in light of emerging scientific evidence on dose and dose-rate effects, summarizes the conclusions recently drawn by a number of international organizations (e.g., BEIR VII, ICRP, SSK, UNSCEAR, and WHO), mentions current scientific efforts to obtain more data on low-dose and low-dose-rate effects at molecular, cellular, animal and human levels, and discusses future options that could be useful to improve and optimize the DDREF concept for the purpose of radiological protection.
Journal Radiation and Environmental Biophysics
Date Sep 2015
Presenter Katuyama I.
Title Biofouling of coastal thermal and nuclear power plant and its prevention method : chlorination
Conference Thermal and nuclear power engineering society Tohoku branch 2015 Technical workshop and tour
Date Sep 2015
Presenter Matsumura T. , Kobayashi S. , Katsuyama I.
Title Method of new efficacy evaluation for antifouling paints by the Green Algae, Ulva prolifera
Conference The Japan Institute of Marine Engineering(JIME)Research Committee for Marine Enviroment Technologies
Date Aug 2015
Author Yoshihisa Kubota, Hideo Tsuji, Taiki Kawagoshi, Naoko Shiomi (National Institute of Radiological Sciences), Hiroyuki Takahashi (Tokyo Nuclear Services Co., Ltd), Yoshito Watanabe, Shoichi Fuma, Kazutaka Doi, Isao Kawaguchi (National Institute of Radiological Sciences), Masanari Aoki, Masahide Kubota, Yoshiaki Furuhata (Japan Wildlife Research Center), Yusaku Shigemura, Masahiko Mizoguchi (Japan NUS Co., Ltd.), Fumio Yamada (Forestry and Forest Products Research Institute), Morihiko Tomozawa (Keio University), Shinsuke H. Sakamoto (University of Miyazaki), and Satoshi Yoshida (National Institute of Radiological Sciences).
Title Chromosomal Aberrations in Wild Mice Captured in Areas Differentially Contaminated by the Fukushima Dai-Ichi Nuclear Power Plant Accident.
Outline Following the Fukushima Dai-ichi Nuclear Power Plant accident, radiation effects on nonhuman biota in the contaminated areas have been a great concern. The induction of chromosomal aberrations in splenic lymphocytes of small Japanese field mice (Apodemus argenteus) and house mice (Mus musculus) inhabiting Fukushima Prefecture was investigated. In mice inhabiting the slightly contaminated area, the average frequency of dicentric chromosomes was similar to that seen in mice inhabiting a noncontaminated control area. In contrast, mice inhabiting the moderately and heavily contaminated areas showed a significant increase in the average frequencies of dicentric chromosomes. Total absorbed dose rate was estimated to be approximately 1 mGy d–1 and 3 mGy d–1 in the moderately and heavily contaminated areas, respectively. Chromosomal aberrations tended to roughly increase with dose rate. Although theoretically, the frequency of chromosomal aberrations was considered proportional to the absorbed dose, chromosomal aberrations in old mice (estimated median age 300 days) did not increase with radiation dose at the same rate as that observed in young mice (estimated median age 105 days).
Journal Environmental Science & Technology, 2015, 49 (16), pp 10074–10083
Link http://pubs.acs.org/doi/pdf/10.1021/acs.est.5b01554
Date Jul 2015
Presenter Ito K. , Tomita Y.
Title Recommendations related to the Problem of Limiting the Life of Japanese Nuclear Power Plants to 40 years, No.2 - Review of Overseas Countries Status
Conference The 12th Academic Symposium by Japan Society of Maintenology, July 2015
Date Jul 2015
Presenter Katsuyama I.
Title Review of antifouling technique for cooling water system and its assessment
Conference Thermal and Nuclear Power Engineering Society
Date Jul2015
Presenter Fujii Y.
Title The Advancement of Maintenance for Nuclear Power Plant in USA.
Conference the 12th Annual Conference, Japan Society of Maintenology
Date Jun 2015
Author Sakurai T. (Meisei University), Satake S. (Japan NUS Co., Ltd.) and Matsuda K. (Tokyo University of Agriculture and Technology).
Title Measurement of the Inorganic Ions in PM2.5 at Western Tokyo and the Evaluation for AQM Performance Based on the Measurement.
Outline Both of the component measurement and the analysis based on Air Quality Model (AQM) are essential for the consideration of PM2.5 reduction measures. In order to collect more information regarding PM2.5 components, long-term weekly measurement for inorganic ions in PM2.5 had been conducted from August 2009 to August 2011 at Meisei University, located in Western Tokyo. The performance of AQM was also clarified based on the comparison between CMAQ simulation and the observation. Observed SO42- and NO3- showed higher concentration in summer and winter season, respectively. Since the ratio of total amount of inorganic ions in PM2.5 mass concentration reached up to 75% in each February, reduction measures for the inorganic ions seemed to be more effective to decrease PM2.5 mass concentration especially in winter season. As AQM performance, a correlation coefficient of around 0.8 was obtained by the comparison with observed SO42-. However, AQM did not show a reasonable performance for NO3- and NH4+ due to both of the sampling artifact originated in the volatilization of NH4NO3 and the model uncertainties especially for the overestimation of NO2 and O3. As a result, it was suggested for the improvement of Nitrate prediction that further observation studies for the volatilization and the precursors such as HNO3 and NH3 were important as well as the evaluation of overestimated NO2 and O3.
Journal Earozoru Kenkyu (Japan Association of Aerosol Science and Technology)
Date May 2015
Presenter Nagaki M.
Title History and Current Status of Fire Protection Regulation for Nuclear Power Plant -Case Study of U.S. Regulation-
Conference the Annual Symposium 2015, Japan Association for Fire Science and Engineering
Date May 2015
Presenter Nobuyuki Teraura (Terrara Code Research Institute, Japan), Kunio Ito (Japan NUS, Japan), Daisuke Kobayashi (Japan Atomic Energy Agency, Japan), Kouichi Sakurai (Kyushu University, Japan)
Title Evaluation of Gamma Ray Durability and its Application of Shielded RF Tags.
Outline The RF tag with radiation shield has been developed and its gamma ray durability has been evaluated in this study. RFID is an item’s identification technology which uses radio wave. By using the technology, RF tag is used to manage the items for its traceability and so on. RF tags include the active RF tag which has a voltaic cell, and a passive RF tag without a voltaic cell. Among them, since it is cheap and can be used over a long period of time regardless of a battery life, the passive RF tag is used in various fields. It is used for equipment maintenance of factories or thermal power plants, and the application examples are widely announced.
Several frequencies are used for RF tag, and RF tag of UHF has a communication range comparatively as long as about 10m, and a remote reading is possible. When it is used in radiation environment at nuclear power plant, the remote reading can contribute to radiation exposure reduction.
However, since semiconductors are the main elements of the function of RF tag, damage due to radiation happens in it, and an error of operation occurs. Therefore, this technology has not been used under relatively high radiological environment. Also in a nuclear power plant, the use has been very limited in a very low radiological environment.
Here, we have developed and manufactured the RF tag with radiation shield cover attached. Here, the communication which uses the radio wave for RF tag may not be affected. It is expected that this RF tag with radiation shield will improve the radiation-proof feature and its application rage will be expanded. Using the radiation-proof RF tag, we have conducted the radiation durability tests. Two types of test, using low energy gamma ray and high-energy gamma ray have been done. Here, the experimental result is described.
The applicability of RF tag with radiation proof capability is considered to become wider, and that can be used under various radiological environments, not only in the nuclear power plant but others, such as spent nuclear fuel storage facility, decommissioning of nuclear power plant, decontamination operation management around Fukushima area, etc.
Conference the 23th International Conference on Nuclear Engineering.
Date Apr 2015
Presenter Katsuyama I.
Title Review of antifouling technique for cooling water system.
Conference Thermal and Nuclear Power Engineering Society (Japan)
Date Apr 2015
Author Horiuchi K. and Oka K.
Title Introduction to Plastination and its Usage.
Journal JEAS News, No.146 (Japan Assosciation of Environment Assessment)
Date Apr 2015
Author Nakamura R.
Title IAEA Activity for Long-term Safe Operation of Nuclear Power Plants. - SALTO peer review
Journal Hozengaku (Japan Society of Maintenology)
Date Mar 2015
Presenter Shinohara C. and Kuwagaki R.
Title Development of CCS communications and knowledge sharing framework.
Conference the Spring Conference 2015 (Mining and Materials Processing Institute of Japan)
Date Mar 2015
Presenter Shinagawa T
Title Environmental education exploring the nature around you: words left by Prof. Hamaguchi.
Conference the 21th Civic environmental activities meeting
Date Jan 2015
Author Yoshihisa Kubota (National Institute of Radiological Sciences), Hiroyuki Takahashi (Tokyo Nuclear Services Co., Ltd), Yoshito Watanabe, Shoichi Fuma, Isao Kawaguchi (National Institute of Radiological Sciences), Masanari Aoki, Masahide Kubota, Yoshiaki Furuhata (Japan Wildlife Research Center), Yusaku Shigemura (Japan NUS Co., Ltd.), Fumio Yamada (Forestry and Forest Products Research Institute), Takahiro Ishikawa, Satoshi Obara, Satoshi Yoshida (National Institute of Radiological Sciences).
Title Estimation of absorbed radiation dose rates in wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi nuclear power plant accident
Outline The dose rates of radiation absorbed by wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident were estimated. The large Japanese field mouse (Apodemus speciosus), also called the wood mouse, was the major rodent species captured in the sampling area, although other species of rodents, such as small field mice (Apodemus argenteus) and Japanese grass voles (Microtus montebelli), were also collected. The external exposure of rodents calculated from the activity concentrations of radiocesium (134Cs and 137Cs) in litter and soil samples using the ERICA (Environmental Risk from Ionizing Contaminants: Assessment and Management) tool under the assumption that radionuclides existed as the infinite plane isotropic source was almost the same as those measured directly with glass dosimeters embedded in rodent abdomens. Our findings suggest that the ERICA tool is useful for estimating external dose rates to small animals inhabiting forest floors; however, the estimated dose rates showed large standard deviations. This could be an indication of the inhomogeneous distribution of radionuclides in the sampled litter and soil. There was a 50-fold difference between minimum and maximum whole-body activity concentrations measured in rodents at the time of capture. The radionuclides retained in rodents after capture decreased exponentially over time. Regression equations indicated that the biological half-life of radiocesium after capture was 3.31 d. At the time of capture, the lowest activity concentration was measured in the lung and was approximately half of the highest concentration measured in the mixture of muscle and bone. The average internal absorbed dose rate was markedly smaller than the average external dose rate (<10% of the total absorbed dose rate). The average total absorbed dose rate to wild rodents inhabiting the sampling area was estimated to be approximately 52 μGy h−1 (1.2 mGy d−1), even 3 years after the accident. This dose rate exceeds 0.1–1 mGy d−1 derived consideration reference level for Reference rat proposed by the International Commission on Radiological Protection (ICRP).
Journal Journal of Environmental Radioactivity 142(2015) 124-131 (International union of Radioecology )
Link http://www.sciencedirect.com/science/article/pii/S0265931X15000168
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