Search Results 1-20 of 40

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  • Determination of Atmospheric Radiocesium by Analyzing Filter-tapes Used in Automated Suspended Particulate Matter Monitors

    OURA Yasuji , TSURUTA Haruo , EBIHARA Mitsuru , OHARA Toshimasa , NAKAJIMA Teruyuki

    <p>著者らは,2011年に発生した東京電力福島第一原子力発電所(以下,原発と記す)事故で放出された放射性セシウム(<sup>134</sup>Csと<sup>137</sup>Cs)の原発事故当時の大気中濃度の定量を,大気汚染常時監視網として全国に設置されている浮遊粒子状物質(SPM)自動測定機(以下,SPM計と記す)で事故当時にテープ …

    BUNSEKI KAGAKU 69(1.2), 1-9, 2020

    J-STAGE  Ichushi Web 

  • DEVELOPMENT OF DIRECTIONAL GAMMA RAY MEASURING INSTRUMENT FOR EVALUATING RADIATION INCIDENT ON ARCHITECTURAL SPACE  [in Japanese]

    KOBAYASHI Hikaru , YAMAMORI Ryo , NAKAJIMA Shusaku , ICHIJO Yusuke , YOSHIDA Hiroko , NOZAKI Atsuo , YOSHINO Hiroshi

    … <p> The authors aim to establish a method for predicting radiation environment and facilitating architectural measures to reduce the radiation space dose rate in a building prior to the construction of a new building in the area affected by the nuclear power plant accident. …

    Journal of Environmental Engineering (Transactions of AIJ) (764), 967-973, 2019-10

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  • Verification of a Quantitative Method of Uranium238 in the Radioactive Waste Using Photon Occurred by Compton Effect  [in Japanese]

    YOKOYAMA Kaoru , HATA Haruhi , NAGANUMA Masaki , OHARA Yoshiyuki , ISHIMORI Yuu

    著者らはウランの偏在を補正する解析手法(以下,「等価モデル法」と記す。)を開発してきた。等価モデル法では,ウラン量の定量に<sup>234m</sup>Paから放出されるγ線(766keV,1001keV)を用い,不均等な線源分布を補正する。定量誤差は計数率が小さいγ線に依存する。定量誤差を低減するため,高い計数率を得る方法を検討した。γ線の多くは,放射性廃棄物中でコンプト …

    RADIOISOTOPES 64(11), 687-696, 2015

    J-STAGE  Ichushi Web 

  • Verification Tests on Nondestructive Assay for ^<238>U Content in Uranium-contaminated Waste Drums Using Gamma Method  [in Japanese]

    YOKOYAMA Kaoru , SUGITSUE Noritake , MUROI Masayuki , SUZUKI Yasuo

    原子力施設から発生する放射性廃棄物の処分では,放射能濃度が受け入れ基準を満たすことを確認する必要がある。本論文では,ウランを対象として,廃棄物収納容器の外部から測定した,ウランの子孫核種(<sup>234m</sup>Pa)から放出される二つのエネルギーのγ線を用い,容器中の廃棄物及びウランが偏在しても放射能濃度を定量可能な測定手法を構築し,実用性を模擬廃棄物で検証した。こ …

    RADIOISOTOPES 62(1), 1-17, 2013-01-15

    J-STAGE  References (4)

  • Quantitative Test for Radioactivity of Uranium Filled in Waste Drums Using Q<sup>2</sup> Low Level Waste Assay Systems  [in Japanese]

    YOKOYAMA Kaoru , HATA Haruhi , OHARA Yoshiyuki , SUGITSUE Noritake

    原子力施設の廃止措置等に伴って発生するウラン系廃棄物を収納した容器中の<sup>238</sup>U量を,パッシブγ線を用いて評価する手法を研究してきた。その結果,子孫核種の<sup>234m</sup>Paから放出される二つのエネルギーのγ線(1001keVと766keV)を用い,廃棄物及び線源が偏在しても<sup>238</su …

    RADIOISOTOPES 62(11), 833-840, 2013

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  • Passive Gamma Ray Measurements for a Simple Determination of Radioactivity of Uranium in Waste Drums  [in Japanese]

    YOKOYAMA Kaoru , SUGITSUE Noritake

    トレンチ処分対象の廃棄物中に含まれるウラン放射能評価への適用を想定し,ドラム缶等の容器に収納された廃棄物のウラン放射能を,パッシブγ線により簡易な方法で定量評価することが可能な手法の理論体系を構築した。廃棄物収納容器を対向位置測定する方法で,廃棄物収納容器の中に3次元的に分布する線源位置を表わす物理量とγ線計数率の変化の関係を表わす評価式を導出した。評価式は,ウラン系列で放出される1001keVと …

    RADIOISOTOPES 59(12), 707-719, 2010-12-15

    J-STAGE  References (8) Cited by (2)

  • Long-Term Continuous In-Situ Measurement of Gamma Rays Using Ge Semiconductor Detector

    IKUTA Misao , EZUMI Shuichi , SUZUKI Takahiro , ENOMOTO Mikio

    … We developed a long-term continuous measurement method for <i>in-situ</i> … gamma-ray measurement using a Ge semiconductor detector (<i>in-situ</i> … Ge measurement), and performed continuous measurement for 36 months by the method. …

    Japanese Journal of Health Physics 45(2), 177-185, 2010-06-01

    J-STAGE  Ichushi Web  References (13) Cited by (1)

  • Radioactivity Measurement of Airborne Particulate Matter at One Spot in the Northern Part of Hiroshima Prefecture

    YANAMAKA Masashi , KATO Kazuo

    … 収集直後にフィルター(ADVANTEC製、HE-40T)に吸着した大気粉塵を密封してOxford社製CPVDS30-0190、体積160cm3の超高純度ゲルマニウム半導体検出器で&gamma;線を測定し、トリウム系列、ウラン系列の放射平衡を考慮した上で放射能を正しく推定するために、時間をおいて複数回放射能を測定した。 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2009(0), 154-154, 2009

    J-STAGE  Ichushi Web 

  • Study of environmental factors affecting <sup>222</sup>Rn emanation from the natural radioactive minerals  [in Japanese]

    HANAMOTO Katsumi , SAKODA Akihiro , NAGAMATSU Tomohiro , ISHIMORI Yuu , YAMAOKA Kiyonori

    … そこで、本研究では、ラドン温泉地周辺に存在する鉱石から空気中への<sup>222</sup>Rn散逸に及ぼす環境諸因子の影響を明確にするために、様々な条件下において鉱石からの<sup>222</sup>Rn散逸率を&gamma;線スペクトロメトリにより測定した。 … 各粒径の乾燥試料を共栓ガラス瓶に入れ密栓し約30日間静置した後、高純度ゲルマニウム検出器による&gamma;線測定を行った。 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2007(0), 269-269, 2007

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  • Variations of radiation levels before and after the Noto Hanto Earthquake in 2007(<Special issue>The Noto Hanto Earthquake in 2007(Part2))  [in Japanese]

    KOMURA Kazuhisa , INAGAKI Miyuki , NISHIKAWA Katatoshi , NAKANISHI Takashi , HAYAKAWA Kazuichi , TANG Ning , YANG Xiaoyang , IIDA Takao , MORIIZUMI Jyun

    環境放射能の観点から能登半島地震発生前後の放射能関連のデータの解析を試みた.解析したのは,輪島市西二又地区で採取した大気浮遊塵中の210Pb,輪島沖50kmに位置する舳倉島のラドン濃度,地震発生後の4月21日から西二又地区で連続測定を実施した空間γ線レベルの3項目である.その結果,地震発生約3週間前から大気浮遊塵試料のラドンの娘核種210Pbの濃度が増加し,地震直前にピークに達した後に低下に転じ, …

    Earth Science (Chikyu Kagaku) 61(5), 335-342, 2007

    J-STAGE  References (5) Cited by (1)

  • Measuring ion in the atmosphere with magnetically levitated ionization chamber  [in Japanese]

    Ichiki Hirofumi , Futagami Koji , Kawaguchi Toshiro , Fukuda Ryu , Utsunomiya Yoshitomo , Korenaga Kazuhito

    … We developed the high sensitivity magnetically levitated ionization chamber and are measuring the amount of ion in the atmosphere with high precision. … This system is used to detect the amount of ion exactly without environmental gamma ray. … Although the resolution of a common ion measuring instrument is about 10cm^<-3>, with the magnetically levitated ionization chamber which we developed, about 1cm^<-3>. …

    九州産業大学工学部研究報告 (43), 49-56, 2006

    IR 

  • Magnetically levitating equipment used for an automatically measuring system of low level radioactive rays(DEPARTMENT OF ELECTRICAL ENGINEERING)  [in Japanese]

    Ichiki Hirofumi , Futagami Koji , Kawaguchi Toshiro , Matoba Masaru , Fukuda Ryu , Utsunomiya Yoshitomo

    … One of them can be detected γ-rays in spite of a simple equipment. … However, measurement of γ-rays in the atmosphere by using the ionization chamber is difficult because of its low sensitivity. … We have developed the high sensitive ionization chamber for γ-rays constructed a magnetically levitating electrode without any insulating support. …

    九州産業大学工学部研究報告 (42), 43-48, 2005

    IR 

  • Effect of exposure to tritiated water and gamma rays during gestation on androgen receptor mRNA expression in the offspring mice epididymis

    Takizawa Shyou , Tabata Naoko , Nishimura Minoru , Tauchi Hiroshi , Ichimasa Michiko , Ichimasa Yusuke

    … Vergouwen et al (1995) reported that the radiosensitivity of the gonocytes was increased with fetal age when pregnant mice were exposed to single doses of X rays. … Fetuses are also very sensitive to environmental endocryn distruptors. …

    The Japan Radiation Research Society Annual Meeting Abstracts 2004(0), 98-98, 2004

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  • Annual Report April 1, 2003 - March 31, 2004

    … ACCELERATOR AND EXPERIMENTAL FACILITIES1.1 Accelerator operation 20031.2 Design of laser coupling with a compact 2.45GHz ECR ion source1.3 Development of the polarized target system for measurement of D( d , p)T reaction2. …

    University of Tsukuba Tandem Accelerator Complex (UTTAC) Annual Report (2003), 2004

    IR 

  • Experimental model for irradiating a restricted region of the rat brain using heavy-ion beams

    Sun Xue-Zhi , Takahashi Sentaro , Kubota Yoshihisa , Zhang Rui , Cui Chun , Nojima Kumie , Fukui Yoshihiro

    … Heavy-ion beams have the feature to administer a large radiation dose in the vicinity of the endpoint in the beam range, its irradiation system and biophysical characteristics are different from ordinary irradiation instruments like X-rays or gamma-rays. …

    The Journal of Medical Investigation 51(1-2), 103-107, 2004

    IR  J-STAGE  Ichushi Web  Cited by (2)

  • Survey and Estimate of Environmental Radiation in Littoral Region of Volcano Bay  [in Japanese]

    Okino Norio , Osumi Toru , Emoto Naohiro

    特集 : 「環境調和型社会を指向して」

    Memoirs of the Muroran Institute of Technology (53), 59-63, 2003-11

    IR 

  • Comparison of ^<15>O-Labeled and ^<18>F-Labeled Water Uptake in a Soybean Plant PETIS (Positron Emitting Tracer Imaging System)

    NAKANISHI Tomoko M. , YOKOTA Harumi , TANOI Keitaro , IKEUE Natsuko , OKUNI Yoko , FURUKAWA Jun , ISHIOKA Noriko S. , WATANABE Satoshi , OSA Akihiko , SEKINE Toshiaki , MATSUHASHI Shinpei , ITO Takehito , KUME Tamikazu , UCHIDA Hiroshi , TSUJI Atsunori

    ダイズにおける<SUP>15</SUP>O標識水と<SUP>18</SUP>F標識水の吸水動態をPETIS (Positron Emitting Tracer Imaging System) 法を用いて比較検討した。<SUP>15</SUP>O標識水 (半減期: 2分) はサイクロトロンを用いて<SUP>14< …

    RADIOISOTOPES 50(6), 265-269, 2001-06-15

    J-STAGE  References (3) Cited by (2)

  • Calculation of the Absorbed Dose for the Overexposed Patients at the JCO Criticality Accident in Tokai-mura

    ISHIGURE NOBUHITO , ENDO AKIRA , YAMAGUCHI YASUHIRO , KAWACHI KIYOMITSU

    … The doses for the overexposed patients were estimated by the measurement result of specific activity of <sup>24</sup>Na in blood. … The present method is almost based on documents of the International Atomic Energy Agency (IAEA) and the Oak Ridge National Laboratory. …

    Journal of Radiation Research 42(SUPPL), S137-S148, 2001

    J-STAGE  NDL Digital Collections  Ichushi Web  Cited by (4)

  • Accurate Measurement of Doses in the Sample Chamber of a <SUP>137</SUP>Csγ-ray Irradiation Apparatus  [in Japanese]

    ABE Toshiaki , YAMAMOTO Hisao , NORIMURA Toshiyuki

    電離箱式線量計を用いて<SUP>137</SUP>Csガンマ線照射装置(ノーディオン社製, ガンマセル40 Exactor)の試料容器内の線量率分布を測定すると共に, 線源駆動時の線量成分を評価した.その結果, 試料容器内の線量率分布は, 上部および下部は中央部より5.2-7.2%高いことが示された.また, 線源駆動時の線量成分は, 定常線量率による1分間の線量の0.85- …

    Journal of UOEH 21(4), 323-329, 1999

    J-STAGE  Ichushi Web 

  • Measurement of Environmental Gamma Rays in Chubu District, Japan  [in Japanese]

    YAMAZAKI T.

    The Thermal and nuclear power 49(4), 481-488, 1998-04-15

    References (4)

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