Search Results 1-20 of 196

  • Enzymatic Hydrolysis of Canola Oil Catalyzed by Lipase

    Nguyen Huynh Phuong Uyen , Pham Thi Phuong Thao , Asada Ryoko , Imamura Kiyoshi , Kitaya Yoshiaki , Furuta Masakazu , Maeda Yasuaki

    … Lipase inactivation by gamma ray irradiation was also examined in absorbance dose range of 0.2-1.0 kGy. …

    Eco-Engineering 32(4), 83-88, 2020

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  • Numerical Analysis of a Concrete Biological Shielding Wall under Neutron Irradiation by 3D RBSM

    Kambayashi Daisuke , Sasano Hiroshi , Sawada Shohei , Suzuki Kiyoteru , Maruyama Ippei

    … <p>In nuclear power plants, concretes used for biological shielding walls are exposed to radiation such as neutrons and gamma rays over the long-term operation of the plant. …

    Journal of Advanced Concrete Technology 18(10), 618-632, 2020

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  • Tolerance of Dried Cells of a Terrestrial Cyanobacterium, <i>Nostoc</i> sp. HK-01 to Temperature Cycles, Helium-ion Beams, Ultraviolet Radiation (172 and 254 nm), and Gamma Rays: Primitive Analysis for Space Experiments

    Tomita-Yokotani Kaori , Yokobori Shin-ichi , Ohmori Masayuki , Kimura Shunta , Ong Midori , Ajioka Reiko , Igarashi Yuichi , Fujishiro Haruka , Katoh Hiroshi , Hashimoto Hirofumi , Mita Hajime

    … HK-01 to cosmic rays to assess its potential application in studies on extraterrestrial environments and the possibility of interplanetary transformation. … HK-01 colonies were exposed to a temperature cycle of 80°C and －80°C for 90 min, vacuum, a helium-ion beam (He), ultraviolet (VUV) rays (172 nm), UV rays (254 nm), and gamma rays (5 kGy). …

    Eco-Engineering 32(3), 47-53, 2020

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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

    … In order to clarify the formation mechanism of the dose rate distribution in the building, in situ measurement of gamma ray incidence characteristics on the outer wall is necessary. …

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

    J-STAGE  AIJ 

  • Hydrogen Production and the Stability of Hardened Cement Paste under Gamma Irradiation

    Ishikawa Shunsuke , Maruyama Ippei , Takizawa Masayuki , Etoh Junji , Kontani Osamu , Sawada Shohei

    … <p>Hardened cement pastes (HCP) with different water contents were irradiated with gamma rays under different temperatures and irradiation dose rates. … The relationship between the quantity of hydrogen gas produced and the water content as well as the stability of HCP under gamma irradiation was evaluated. … The CBW was not susceptible to gamma irradiation. …

    Journal of Advanced Concrete Technology 17(12), 673-685, 2019

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  • Background studies of high energy gamma rays from (n,gamma) reactions in the CANDLES experiment

    Nakajima K. , Iida T. , Akutagawa K. , Batpurev T. , Chan W.M. , Dokaku F. , Fushimi K. , Kakubata H. , Kanagawa K. , Katagiri S. , Kawasaki K. , Khai B.T. , Kino H. , Kinoshita E. , Kishimoto T. , Hazama R. , Hiraoka H. , Hiyama T. , Ishikawa M. , Li X. , Maeda T. , Matsuoka K. , Moser M. , Nomachi M. , Ogawa I. , Ohata T. , Sato H. , Shamoto K. , Shimada M. , Shokati M. , Takahashi N. , Takemoto Y. , Takihira Y. , Tamagawa Y. , Tozawa M. , Teranishi K. , Tetsuno K. , Trangd V.T.T. , Tsuzukid M. , Umehara S. , Wang W. , Yoshida S. , Yotsunaga N.

    … High energy γrays with several MeV produced by (n,γ) reactions can be a trouble for low background measurements in the underground laboratories such as double beta decay experiments. … In the CANDLES project, which aimed to observe the neutrino-less double beta decay from 48 Ca, γrays caused by (n,γ) reactions were found to be the most significant background. …

    Astroparticle physics (100), 54-60, 2018-02-27

    IR 

  • Multi Photon Emission Gamma-Ray Imaging using Coincidence Detection:-For high sensitivity Compton Imaging-  [in Japanese]

    SHIMAZOE Kenji , Mizumachi Yuki , Uenomachi Mizuki , Takahashi Hiroyuki

    … <p>Gamma-ray imaging for sub-MeV to a few MeV range is strongly required for nuclear medicine and environmental radiation monitoring. … The coincidence detection of this cascaded gamma-rays could improve the signal to noise ratio by extracting the intersection of multiple Compton cones. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018(0), 1P2-L03, 2018

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  • Nuclear Polymorphism Induced Genomic Instability in Cluster Bean [<i>Cyamopsis tetragonoloba</i> (L.) Taub.] (Fabaceae)

    Kumar Girjesh , Singh Shefali

    … <p>Several environmental and mutagenic factors lead to induce nuclear polymorphism like micronuclei (MN) and nuclear buds. … Combined mutagenic treatment of gamma rays and ethyl methane sulphonate (EMS) was experienced to induce formation of MN and nuclear buds in cluster bean [<i>Cyamopsis tetragonoloba</i> …

    CYTOLOGIA 83(2), 137-141, 2018

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  • Evaluation of Ambient Dose Equivalent Rates Owing to Natural Radioactive Nuclides in Eastern Japan by Car-Borne Surveys Using KURAMA–II  [in Japanese]

    ANDOH Masaki , MATSUDA Norihiro , SAITO Kimiaki

    … The distribution of the evaluated natural background radiation reflected geological features, and it was found that the radiation measured along paved roads reflected the distribution of terrestrial gamma rays. …

    Transactions of the Atomic Energy Society of Japan 16(2), 63-80, 2017

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  • Radioactivity Analysis Using Commercially Available Chemical Reagents as Calibration Sources  [in Japanese]

    KOIKE Yuya , SUZUKI Ryoichiro , OCHI Kotaro , HAGIWARA Kenta , NAKAMURA Toshihiro

    … 環境試料を，ゲルマニウム半導体検出器で&gamma;線測定する場合に，放射能体積線源を校正用線源として用いる．環境試料の放射能分析は，非密封放射性物質を使用できない施設で測定を行うこともある．さらに，試料容器には一般的にねじ口式U-8容器等が使用されているが，規格化されたものはないため，測定試料に応じて様々な形状の容器を選択し，その容器に応じて校正用線源を独自に作成することが望ましい． …

    BUNSEKI KAGAKU 66(4), 263-270, 2017

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  • Measuring apparent dose rate factors using beta and gamma rays, and alpha efficiency for precise thermoluminescence dating of calcite

    OGATA Manabu , HASEBE Noriko , FUJII Naoki , YAMAKAWA Minoru

    … Relative TL factors for calcite after beta and gamma irradiation normalized with quartz, hereafter termed the beta and gamma factors, were measured as 0.19–0.34 and 0.16–0.33, respectively. … The beta factor is higher than the gamma factor for some samples. … thus, the concentration of minor elements may cause differing behavior between beta and gamma rays. … The gamma factor may depend on Mn concentration; …

    Journal of Mineralogical and Petrological Sciences 112(6), 336-345, 2017

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  • Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

    Maruyama Ippei , Kontani Osamu , Takizawa Masayuki , Sawada Shohei , Ishikawao Shunsuke , Yasukouchi Junichi , Sato Osamu , Etoh Junji , Igari Takafumi

    … Presently, the soundness of concrete members subject to radiation is evaluated based on whether the predicted fast neutron fluence and gamma-ray dose values are lower than specific reference values in Japan, which are 1×10<sup>20</sup> … We quantitatively evaluated the influence of neutrons, gamma-rays, and the resultant heating and drying processes on the strength of concrete as well as their underlying mechanisms. …

    Journal of Advanced Concrete Technology 15(9), 440-523, 2017

    J-STAGE 

  • Development of an ASIC preamplifier for electromagnetic sensor probes for monitoring space electromagnetic environments

    Ozaki Mitsunori , Yagitani Satoshi , Kojima Hirotsugu , Takahashi Ken , Koji Hiroki , Zushi Takahiro , Tokunaga Yuya

    … Miniaturization and high environmental (temperature and radiation) robustness are key requirements for scientific instrument design toward a sensor network consisting of palm-sized probes. … Moreover, the radiation robustness for the total ionizing dose (TID) level is evaluated by irradiation with gamma rays from cobalt-60. …

    Earth, Planets and Space (68), 2016-05-28

    IR 

  • Identification of gamma ray irradiation-induced mutations in membrane transport genes in a rice population by TILLING

    Hwang Jung Eun , Jang Duk-Soo , Lee Kyung Jun , Ahn Joon-Woo , Kim Sang Hoon , Kang Si-Yong , Kim Dong Sub , Kim Jin-Baek

    … <p>A high-salt environment represents environmental stress for most plants. …

    Genes & Genetic Systems 91(5), 245-256, 2016

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  • Solar Neutron and Gamma-ray Monitor on the ChubuSat-2 Satellite

    YAMAOKA Kazutaka , MATSUSHITA Koji , MIYATA Kikuko , MIYAZAWA Takuya , NAGANO Hosei , NARUSAWA Yasutaka , NISHINO Masaki , NODA Sosuke , OSEKI Shinji , SADAMOTO Masaaki , SUZUKI Asami , BABAZAKI Yasunobu , TAJIMA Hiroyasu , TAMURA Keisuke , TANAKA Hidetaka , TANAKA Hiroya , TAGUCHI Masato , TAM Dao ngoc hanh , WATABE Toyoki , HAYASHI Yuki , KANEDA Hidehiro , KATSURAGAWA Taishi , KAWAHARA Hiroaki , KOKUSHO Takuma , KUBO Shin , MATSUNAGA Kazunari

    … The ChubuSat-2 mission is devoted to monitoring neutrons and gamma-rays in the ASTRO-H orbit which can be noise sources for ASTRO-H X-ray and soft gamma-ray observations. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 14(ists30), Pf_141-Pf_146, 2016

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  • MONTE CARLO CALCULATION FOR RADIATION DOSE PREDICTION:Easily predicting Monte Carlo method for indoor radiation dose (Part 1)  [in Japanese]

    OMORI Toshiaki , KATO Shinsuke , KIM Minsik , NUKATSUKA Shigehiro

    … We employed the Monte Carlo method to calculate gamma ray penetration through various shield configurations and the absorption within an object positioned at an evaluation point. … The gamma rays shifted to lower energy levels caused by the Compton scattering, i.e. buildup fluxes, were simply treated using the buildup factor as a function of the mean free path of photons.<br> RADAR-&gamma; …

    Journal of Environmental Engineering (Transactions of AIJ) 81(727), 835-843, 2016

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  • <b>The Deposition Map Obtained through Radioactivity Analysis of Mosses </b>  [in Japanese]

    OHARA Soji , MUKAI Atsushi , FUJIWARA Noboru

    宮城県石巻市から福島県飯舘村を中心に33点のコケを採取しCs-137残留放射能の分析を行い，福島第一原発事故に伴うCs-137の放射能拡散状況を把握することを目的とした研究を行った．地形条件と拡散放射能の残留状況との関係も結果的に明らかになることも目指した．コケの高い放射能吸着性とカーペット状に地表を覆う特性に注目し，単位面積当たりのCs-137残留放射能量を求めた．コケは土壌に比べて種類による放 …

    Journal of Environmental Conservation Engineering 44(8), 460-467, 2015

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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 

  • ICONE23-1180 DEVELOPMENT OF INSTRUMENTATION SYSTEMS FOR SEVERE ACCIDENTS :1. R&D IN HITACHI-GE

    Shinma Daisuke , Tominaga Kazuo , Tadokoro Takahiro , Arita Setsuo , Murata Akira , Matsui Tetsuya

    … Hitachi-GE has also been developing some instrumentation systems for use under severe environmental conditions during a severe accident including a fiber optic radiation monitor and a fiber optic water level monitoring system. … The fiber optic radiation monitor uses a neodymium doped radiation luminescence element which emits infrared wavelength light when irradiated by gamma-rays. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23(0), _ICONE23-1-_ICONE23-1, 2015

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