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Decrease of radionuclide sorption in hydrated cement systems by organic ligands; Comparative evaluation using experimental data and thermodynamic calculations for ISA/EDTA-actinide-cement systems

Ochs, M.*; Dolder, F.*; 舘 幸男

Applied Geochemistry, 136, p.105161_1 - 105161_11, 2022/01



Investigation on the influence of additional protective measures on sheltering effectiveness for internal exposure

廣内 淳; 高原 省五; 駒ヶ峯 弘志*; 宗像 雅広

Proceedings of Asian Symposium on Risk Assessment and Management 2019 (ASRAM 2019) (USB Flash Drive), 7 Pages, 2019/09



Sorption parameter setting approaches for radioactive waste disposal considering perturbation effects; Sorption reduction factors for organics

舘 幸男; Ochs, M.*

Progress in Nuclear Science and Technology (Internet), 5, p.229 - 232, 2018/11



Investigation of reduction factor of internal exposure for sheltering in Japan

廣内 淳; 高原 省五; 駒ヶ峯 弘志*; 宗像 雅広

Proceedings of Asian Symposium on Risk Assessment and Management 2018 (ASRAM 2018) (USB Flash Drive), 8 Pages, 2018/10



Review of reduction factors by buildings for gamma radiation from radiocaesium deposited on the ground due to fallout

吉田 浩子*; 松田 規宏; 斎藤 公明

Journal of Environmental Radioactivity, 187, p.32 - 39, 2018/07

 被引用回数:9 パーセンタイル:22.62(Environmental Sciences)

In order to estimate residents' external dose due to radionuclide exposure resulting from fallout deposit on the ground, the shielding and dose reduction effects provided by structures such as houses and workplaces are taken into account as most individuals spend a large portion of their time indoors. Soon after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, several measurements and calculations were performed to obtain specific reduction factors for Japanese settlements due to this lack of data. This research reviews previous studies that determined factors such as, shielding factors, protection factors, reduction factors, and location factors and summarizes specific results for Japan. We discuss the issues in determining these factors and in applying them to estimate indoor dose. The contribution of surface contamination to the indoor ambient dose equivalent rate is also discussed.


Identification of penetration path and deposition distribution of radionuclides in houses by experiments and numerical model

廣内 淳; 高原 省五; 飯島 正史; 渡邊 正敏; 宗像 雅広

Radiation Physics and Chemistry, 140, p.127 - 131, 2017/11


 被引用回数:2 パーセンタイル:28.88(Chemistry, Physical)

The dose assessment for people living in preparation zones for the lifting of the evacuation order is needed with the return of the residents. However, it is difficult to assess exactly indoor external dose rate because the indoor distribution and infiltration pathways of radionuclides are unclear. This paper describes indoor and outdoor dose rates measured in eight houses in the difficult-to-return zone in Fukushima prefecture to examine the distribution of radionuclides in a house and the main infiltration pathway of radionuclides. In addition, it describes also dose rates calculated with a Monte Carlo photon transport code to understand thoroughly the measurements. These measurements and calculations provide that radionuclides can infiltrate mainly through ventilations, windows, and doors, and then deposit near the gaps, while those infiltrate hardly through sockets and air conditioning outlets.


Measurements of air dose rates in and around houses in the Fukushima Prefecture in Japan after the Fukushima accident

松田 規宏; 三上 智; 佐藤 哲朗*; 斎藤 公明

Journal of Environmental Radioactivity, 166(Part 3), p.427 - 435, 2017/01

 被引用回数:11 パーセンタイル:51.46(Environmental Sciences)

Measurements of air dose rates in less contaminated areas were conducted in and around houses. The relation of both was summarized as dose reduction factors. For wooden and lightweight steel houses, the dose rates showed a positive correlation and linear regression with a slope-intercept form due to the natural background. The average dose reduction factor was 0.38 on the first floor. The reductions in indoor dose rates are observed because a patch of ground under each house is not contaminated (this is the so-called uncontaminated effect). The characteristics were clarified through Monte Carlo simulations. For reinforced steel-framed concrete houses, the dose rates did not show a correlation. It was found that there is a great variation in air dose rates even within one house, such as the size and shape of a house, construction materials acting as a shield and as sources, position (including height) within a room, floor number, total number of floors, and surrounding environment.


Investigation of hydrogen isotope permeation through F82H steel with and without a ceramic coating of Cr$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ including CrPO$$_{4}$$, Out-of-pile tests

Kulsartov, T. V.*; 林 君夫; 中道 勝*; Afanasyev, S. E.*; Shestakov, V. P.*; Chikhray, Y. V.*; Kenzhin, E. A.*; Kolbaenkov, A. N.*

Fusion Engineering and Design, 81(1-7), p.701 - 705, 2006/02

 被引用回数:33 パーセンタイル:90.23(Nuclear Science & Technology)

核融合炉構造材料へのセラミック被覆は、トリチウム透過防止膜として使用されることが考えられている。本研究では、リン酸クロム(CrPO$$_{4}$$)を含む酸化クロム-二酸化ケイ素のセラミック皮膜がある場合とない場合におけるF82H鋼について、水素及び重水素透過実験を行った。まず第1段階として、300$$sim$$600$$^{circ}$$Cの100$$sim$$1000Paの水素及び重水素雰囲気において、皮膜のないF82H鋼中の透過実験を行った。得られた拡散係数,透過定数及び溶解度は、以前に公刊されている値と良い一致を示した。第2段階としては、皮膜を施したF82H鋼中について、400$$sim$$600$$^{circ}$$C, 1000$$sim$$1500Paの重水素雰囲気において、上と同様な透過実験を行い、皮膜の透過低減係数(PRF)を算出した。600$$^{circ}$$Cにおける透過低減係数は約400であった。この値は、同じ皮膜を316ステンレス鋼に施した場合の透過低減係数(約1000)に匹敵する値である。本発表は、国際科学技術センター(ISTC)によるパートナープロジェクト(K-1047p)として実施した研究の成果の一部を発表するものである。


Main features of ITER vacuum vessel and approach to code application

中平 昌隆; 武田 信和; 羽田 一彦; 多田 栄介; 宮 健三*; 朝田 泰英*

Proceedings of 10th International Conference on Nuclear Engineering (ICONE 10) (CD-ROM), 7 Pages, 2002/04


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