Search Results 1-20 of 95

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  • Effect of Secondary Radiation from Lead Shielding During Liquid Scintillation Counting

    Sato Yasushi

    <p>液体シンチレーション計数装置により放射能を校正するための計数効率に関して,MICELLE2プログラムとEGS5-MPIコードを用い,鉛遮蔽体による二次放射線を含めて計数効率を求めた。その結果,電子捕獲γ線を放出する<sup>54</sup>Mnについては,鉛遮蔽体の影響により,計数効率が0.5%程度増加し,<sup>54</sup> …

    RADIOISOTOPES 69(3), 117-120, 2020

    J-STAGE 

  • The Role of Natural Radiation in the Evolution of Ancient Microbes  [in Japanese]

    NARUMI Issay , MARUYAMA Shigenori

    … Cosmic radiation contains galactic cosmic rays and solar energetic particles. … However, the ground level radiation dose rate of secondary muons derived from a supernova event that causes the most severe biological effects among forms of cosmic radiation is estimated to be 1 sievert (Sv) per year at most, which is too low to have lethal and mutagenic effects on terrestrial microbes. …

    Journal of Geography (Chigaku Zasshi) 128(4), 649-665, 2019

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  • Development of a dual phantom technique for measuring the fast neutron component of dose in boron neutron capture therapy.

    Sakurai Yoshinori , Tanaka Hiroki , Kondo Natsuko , Kinashi Yuko , Suzuki Minoru , Masunaga Shinichiro , Ono Koji , Maruhashi Akira

    … Although the dose deposition due to secondary gamma rays is dominant, the relative contributions of thermal neutrons (below 0.5 eV) and fast neutrons are virtually equivalent under typical irradiationconditions in a water and/or acrylic phantom. … Experiments confirmed that the thermalneutron flux and secondary gamma-ray dose rate decreased substantially; …

    Medical physics 42(11), 6651-6657, 2015-10-25

    IR 

  • Radiation Safety Management in the JT-60 Facilities  [in Japanese]

    KOBAYASHI Kazuhiro , SASAJIMA Tadayuki

    臨界プラズマ試験装置JT-60では,1989年まで水素実験を実施した後,1991年より18年間重水素を使った実験運転を実施してきた.重水素実験では,高エネルギーをもった中性子が発生し,2次γ線が放出され,また,重水素同士の反応によって,プラズマ中にトリチウムが生成される.JT-60については,放射線障害防止法(障防法)の適用を受け,放射線発生装置におけるプラズマ発生装置として認可され,放射性同位元 …

    プラズマ・核融合学会誌 89(11), 810-813, 2013-11

    NDL Digital Collections 

  • Chromosome stickiness leading to desynapsis and sterility in safflower

    Srivastava Preeti

    … In a population of safflower (Family: Asteraceae) treated with gamma rays three out of twenty five plants scored at 45KR treatment dose were found to have desynapsis and heavy chromosome stickiness spread at nearly all phases of division accompanied by high pollen sterility. … Meiosis was perfectly normal in control plants however plants treated with gamma rays possessed different types of chromosomal aberrations. …

    Chromosome Botany 7(1), 37-41, 2012

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  • Status of JENDL High Energy File

    WATANABE Y. , KOSAKA K. , KUNIEDA S. , CHIBA S. , FUJIMOTO R. , HARADA H. , KAWAI M. , MAEKAWA F. , MURATA T. , NAKASHIMA H. , NIITA K. , SHIGYO N. , SHIMAKAWA S. , YAMANO N. , FUKUHORI T.

    … The JENDL/HE-2007 includes neutron total cross sections, nucleon elastic scattering cross sections and angular distributions, nonelastic cross sections, production cross sections and double-differential cross sections of secondary light particles (n, p, d, t, 3He, α, and π) and gamma-rays, isotope production cross sections, and fission cross sections in the ENDF-6 format. …

    Journal of the Korean Physical Society 59(2), 1040-1045, 2011-08

    IR 

  • Radiation-induced Increase of White Turbidity in a Polymer Gel Dosimeter Based on Hydrogel of a Cellulose Derivative  [in Japanese]

    YAMASHITA Shinichi , HIROKI Akihiro , NAGASAWA Naotsugu , TAGUCHI Mitsumasa

    … 実用的な範囲の線量(0-10 Gy)で<SUP>60</SUP>Co &gamma;線照射を行った結果、照射に伴う白濁化が確認できた。 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2011(0), 285-285, 2011

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  • Suzaku Wide-band All-sky Monitor (WAM) observations of high energy transients

    山岡 和貴 , 杉田 聡司 , 田代 信 , 寺田 幸功 , 浦田 裕次 , 恩田 香織 , 遠藤 輝 , 小高 夏来 , 守上 浩市 , 菅佐原 たか子 , 岩切 渉 , 深沢 泰司 , 高橋 拓也 , 上原 岳士 , 花畑 義隆 , 牧島 一夫 , 中澤 知洋 , 宮脇 良平 , 榎戸 輝揚 , 高橋 忠幸 , 国分 紀秀 , 大野 雅功 , 鈴木 素子 , Yamaoka Kazutaka , Sugita Satoshi , Tashiro Makoto S. , Terada Yukikatsu , Urata Yuji , Onda Kaori , Endo Akira , Kodaka Natsuki , Morigami Kouichi , Sugasawara Takako , Iwakiri Wataru , Fukazawa Yasushi , Takahashi Takuya , Uehara Takeshi , Kira Chie , Hanabata Yoshitaka , Makishima Kazuo , Nakazawa Kazuhiro , Miyawaki Ryohei , Enoto Teruaki , Takahashi Tadayuki , Kokubun Motohide , Ohno Masanori , Suzuki Motoko

    著者人数: 37人資料番号: AA0064306048

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop (JAXA-SP-08-014E), 242-247, 2009-02-27

    IR 

  • Radiation-induced senescence-like growth arrest in primary human thyroid cells

    HOMMA Takujiro , SUZUKI Keiji , YAMASHITA Shunichi

    … 放射線被爆後の発がんの多段階的なプロセスを明らかにするために、本研究では、バセドウ病患者より提供を受けた初代甲状腺細胞の、&gamma;線照射に対する放射線初期応答について解析を行った。 … まず、1 Gyの&gamma;線を照射し、DNA損傷チェックポイント因子のフォーカスを計測することによりDNA損傷チェックポイントの活性化を評価した。 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2009(0), 143-143, 2009

    J-STAGE  Ichushi Web 

  • Radiation Doses for Human Exposed to Galactic Cosmic Rays and Their Secondary Products on the Lunar Surface

    HAYATSU Kanako , HAREYAMA Makoto , KOBAYASHI Shingo , YAMASHITA Naoyuki , MIYAJIMA Mitsuhiro , SAKURAI Kunitomo , HASEBE Nobuyuki

    … On the lunar surface, every human being would be exposed to galactic cosmic rays (GCRs) and their secondary products such as gamma rays and neutrons. … Moreover, the dose due to these neutrons among the secondary particles reaches 50 mSv/yr, suggesting that the dose due to neutrons must be considered from the viewpoint of the human activity on the lunar surface. …

    Biological Sciences in Space 22(2), 59-66, 2008-10-01

    J-STAGE  Ichushi Web  References (28) Cited by (1)

  • Hydrogen peroxide induces DNA double-strand breaks by a distinct process from X-rays  [in Japanese]

    KATSUBE Takanori , MORI Masahiko , TSUJI Hideo , SHIOMI Tadadhiro , ONODA Makoto

    … 実際,H<SUB>2</SUB>O<SUB>2</SUB>に曝露された細胞において,DSBsのマーカーとされる&gamma;H2AXフォーカスが形成されることも確認された。 … ところが,X線による&gamma;H2AXフォーカスの局在がATM[pS1981]フォーカスと極めてよく一致するのに対して,H<SUB>2</SUB>O<SUB>2</SUB>による&gamma;H2AXフォーカスは必ずしもATM[pS1981]フォーカスと共局在しなかった。 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2008(0), 113-113, 2008

    J-STAGE 

  • Rat mammary carcinogenesis induced by carbon ion radiation  [in Japanese]

    Tatsuhiko IMAOKA Tatsuhiko , NISHIMURA Mayumi , IIZUKA Daisuke , KAKINUMA Shizuko , SHIMADA Yoshiya

    重粒子線がん治療の進展による患者の長期生存に伴い、今後は晩期障害、とりわけ二次がんリスクの顕在化が懸念される。現在、重粒子線の二次がんリスクに関する知見は十分でない。また重粒子線のがん誘発機序も、明確には理解されていない。我々は、放射線発がんリスクの高い臓器である乳腺に着目して、動物実験により放医研HIMACの炭素イオン線のがん誘発効果の解析および腫瘍の遺伝子異常の探索を行った。初めに4系統のラッ …

    The Japan Radiation Research Society Annual Meeting Abstracts 2008(0), 55-55, 2008

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  • Delayed effects of heavy ions in the progeny of irradiated normal human fibroblasts  [in Japanese]

    HAMADA Nobuyuki , HARA Takamitsu , FUNAYAMA Tomoo , SAKASHITA Tetsuya , KOBAYASHI Yasuhiko

    放射線の照射により生じるDNA損傷を修復した細胞は、一見正常に増殖するが、子孫細胞には細胞増殖死や染色体異常などが遅延的に誘発されることが知られており、この現象は、放射線誘発遺伝的不安定性と呼ばれている。本研究では、遺伝的不安定性誘発のLET依存性を明らかにするために、<SUP>60</SUP>Coガンマ線(LET = 0.2 keV/μm)あるいは6種の重粒子線(1 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2007(0), 340-340, 2007

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  • Can hydrogen peroxide induce DSBs through a long-term cellular response?  [in Japanese]

    KATSUBE Takanori , MORI Masahiko , TSUJI Hideo , SHIOMI Tadahiro , ONODA Makoto

    … Reactive oxygen species (ROS) are generated within cells by ionizing radiation via primary ionizing events as well as through secondary amplification systems including metabolic synthesis. … In the current study, we compared cellular responses to hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>) and X-rays in DNA repair-deficient cells. … Consistently, &gamma;H2AX staining revealed a dose-dependent formation of DSBs in the X-irradiated cells (~50 DSBs/cell/Gy). …

    The Japan Radiation Research Society Annual Meeting Abstracts 2007(0), 130-130, 2007

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  • Measurement of Strontium-89 Solution Sources for Bone Pain Palliation Using Re-Entrant Ionization Chambers  [in Japanese]

    YAMADA Takahiro , NAKAMURA Yoshihide , SATO Yasushi , YUNOKI Akira , HINO Yoshio

    現在, 我が国においては, 数種の放射性医薬品が広く利用されている。これらは主に<SUP>99m</SUP>Tc, <SUP>67</SUP>Ga, <SUP>201</SUP>T1, <SUP>18</SUP>Fといったγ線放出核種からなる診断薬である。放射能測定には井戸形電離箱が主に利用されている。 …

    RADIOISOTOPES 56(3), 93-101, 2007

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  • TeV Gamma-Rays from Old Supernova Remnants

    Yamazaki Ryo , Kohri Kazunori , Bamba Aya , Yoshida Tatsuo , Tsuribe Toru , Takahara Fumio

    … When the SNR age is around 105 yrs, hadron acceleration is efficient enough to emit TeV γ-rays both at the shock of the SNR and that in the GMC. … The maximum energy of primarily accelerated electrons is so small that TeV γ-rays and X-rays are dominated by hadronic processes, π 0-decay and synchrotron radiation from secondary electrons, respectively. …

    Monthly Notices of the Royal Astronomical Society 371(4), 1975-1982, 2006-10

    IR  Cited by (9)

  • LET dependence of late-arising loss of clonogenicity  [in Japanese]

    HAMADA Nobuyuki , HARA Takamitsu , SAKASHITA Tetsuya , WADA Seiichi , KAKIZAKI Takehiko , SUZUKI Michiyo , FUKAMOTO Kana , FUNAYAMA Tomoo , KOBAYASHI Yasuhiko

    高LET放射線は、低LET放射線に比べて、生物学的効果が高く、物理学的特性にも優れていることから、がん治療に応用されている。しかし、腫瘍病巣の内部および周囲には正常細胞が混在するため、正常組織への照射は不可避である。一方、放射線照射生存子孫細胞において遅延的に増殖死が引き起こされることが知られているが、そのLET依存性は解明されていない。そこで、本研究では、高密度接触阻害培養をしたヒト正常二倍体線 …

    The Japan Radiation Research Society Annual Meeting Abstracts 2006(0), 293-293, 2006

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  • Tumor Induction in Mice Locally Irradiated with Carbon Ions : A Retrospective Analysis

    ANDO Koichi , KOIKE Sachiko , OOHIRA Chisa , OGIU Toshiaki , YATAGAI Fumio

    … Tumor induction in mice legs that were locally irradiated with carbon ions was compared to tumor induction by &gamma; … rays after single and fractionated irradiation. … A total of 77 tumors were induced in 371 mice that received &gamma;-ray doses of 45 through 95 Gy. … 60%) after &gamma;-ray irradiation, followed by carcinomas (25%) such as adenocarcinoma and squamous cell carcinoma. …

    Journal of Radiation Research 46(2), 185-190, 2005-06-30

    J-STAGE  NDL Digital Collections  Ichushi Web  References (17) Cited by (2)

  • Temporal Variation of Excess Mortality Rate from Solid Tumors in Mice Irradiated at Various Ages with Gamma Rays

    SASAKI Shunsaku , FUKUDA Nobuo

    … Mice were irradiated with 1.9-Gy gamma rays at day 17 in intra-uterine age, or day 0, 7, 35, 105 or 365 in postnatal age. … However, radiation-induced genomic instability and/or delayed mutation may be of secondary importance when radiation was delivered promptly, because the present analysis revealed that the major action of radiation took place soon after irradiation, as one or more hits for transitions of stages for carcinogenesis. …

    Journal of Radiation Research 46(1), 1-19, 2005-03-25

    J-STAGE  NDL Digital Collections  Ichushi Web  References (65) Cited by (2)

  • Experimental study on treatment planning verification using a positron emitting ^<10>C beam for heavy-ion radiotherapy  [in Japanese]

    ISEKI Yasushi , URAKABE Eriko , KANAZAWA Mitsutaka , KITAGAWA Atsushi , TOMITANI Takehiro , SUDA Mitsuru , SATO Shinji , KANAI Tatsuaki

    … In this verification, probing beams of positron emitters are implanted into the tumor, and pairs of annihilation gamma rays are detected with a positron camera.<BR>This paper demonstrates an application to verify [P1]treatment planning. …

    Japanese Journal of Medical Physics 24(4), 142-153, 2004-12-31

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