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Takahara, Shogo; Iimoto, Takeshi*; Igarashi, Takayuki*; Kawabata, Masako*
Hoken Butsuri (Internet), 58(2), p.50 - 58, 2023/08
The Health Physics Society of Japan established a working group to obtain the insights and findings from the articles, which are related to the Fukushima Daiichi Nuclear Power Station (1F) accident, published in the Japanese Journal of Health Physics. This paper describes the results of the review on 47 articles, which are classified into the field without risk communication, environmental measurement and monitoring, radiation dose measurement and assessment, radiation medicine and radioactive waste. In the reviewed articles, there are various insights and issues depending on the standpoint of the authors and social interests in the timing those published. It is important to face these insights and issues to consider prudently "what is health physics or radiation protection?" for the future development of the Health Physics society.
Igarashi, Yu; Yamaguchi, Ichiro*; Oda, Keiji*; Fukushi, Masahiro*; Sakama, Minoru*; Iimoto, Takeshi*
Nihon Hoshasen Anzen Kanri Gakkai-Shi, 21(2), p.74 - 76, 2022/11
no abstracts in English
Igarashi, Masayasu*; Matsumoto, Tomohiro*; Yagihashi, Fujio*; Yamashita, Hiroshi*; Ohara, Takashi; Hanashima, Takayasu*; Nakao, Akiko*; Moyoshi, Taketo*; Sato, Kazuhiko*; Shimada, Shigeru*
Nature Communications (Internet), 8, p.140_1 - 140_8, 2017/07
Times Cited Count：25 Percentile：63.68(Multidisciplinary Sciences)Kitagaki, Toru; Hoshino, Takanori; Sambommatsu, Yuji; Yano, Kimihiko; Takeuchi, Masayuki; Igarashi, Takeshi*; Suzuki, Tatsuya*
Journal of Radioanalytical and Nuclear Chemistry, 296(2), p.975 - 979, 2013/05
Times Cited Count：4 Percentile：32.32(Chemistry, Analytical)
SO
/HNO
mixed solutionLi, Z.*; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Nagame, Yuichiro; Sch
del, M.; Pershina, V.*; et al.
Radiochimica Acta, 100(3), p.157 - 164, 2012/03
Times Cited Count：14 Percentile：68.93(Chemistry, Inorganic & Nuclear)Wei, G.; Koseki, Tadashi*; Tomizawa, Masahito*; Igarashi, Susumu*; Ishii, Koji*; Ando, Ainosuke; Takano, Jumpei*; Uota, Masahiko*; Fan, K.*; Hatakeyama, Shuichiro; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.3918 - 3920, 2010/05
Igarashi, Shinichi*; Itakura, Akiko*; Kitajima, Masahiro*; Nakano, Shinsuke*; Muto, Shunsuke*; Tanabe, Tetsuo*; Yamamoto, Hiroyuki; Hojo, Kiichi
Japanese Journal of Applied Physics, Part 1, 45(5A), p.4179 - 4182, 2006/05
Times Cited Count：3 Percentile：12.91(Physics, Applied)By utilizing surface stress to modify surface reaction potential and increase surface reactivity, a technique for the twodimensional patterning of surface chemical reactions may be realized by surface stress modulation. A blister is a local protrusion on a solid surface induced by gas ion irradiation, and is considered to create local stress on surface layers. Si(100) substrate was irradiated with H
(incident energy: 10 keV, fluence: 1
10
ions) at an angle of 30 to the surface normal. Blisters of 1-5 mm in diameter at the base were formed. After the ion irradiation, the substrate was oxidized. Scanning Auger electron microscopy revealed that, compared with the flat surface, the perimeters of the blisters had a higher oxygen intensity whereas the blister tops had a lower oxygen intensity. The stress distribution of the blister was calculated using the finite element method. It was found that the surface layers were stretched laterally at the blisters tops and compressed at theperimeters, relative to the flat surface. There was a clear correspondence between the O distribution and the stress distribution on the surface. Our results indicate that the patterned oxidation of the Si surface can be governed by the application of surface stress.
Igarashi, Shinichi*; Itakura, Akiko*; Kitajima, Masahiro*; Nakano, Shinsuke*; Muto, Shunsuke*; Tanabe, Tetsuo*; Yamamoto, Hiroyuki; Hojo, Kiichi
Hyomen Kagaku, 25(9), p.562 - 567, 2004/09
Surface stress can be utilized positively in modifying the surface reaction potential and increasing the surface reactivity. Blister is a local protrusion of solid surface induced by gas ion irradiation, and is considered to create local stress on surface layers. Si(100) substrate was irradiated with 10 keV H (fluence; 110 ions/m
) at an angle of 30
to the surface normal. The blisters of several 
m in diameter at the bottom were formed. After the ion irradiation, the substrate was oxidized. By means of scanning Auger microscopy, we observed that the rims of the blisters have higher oxygen intensities than the flat surfaces and the tops have lower than the flats. The calculated stress distribution of the blister shows that the surface layers should be stretched laterally at the top of blisters and are compressed at the rim, relative to the flat surfaces. The O distribution clearly consists with the stress distribution of the surface. Our results demonstrate a patterned oxidation of Si surface applying its reactivity depending on the surface stress.
Kuramochi, Masaya*; Kinsho, Michikazu; Irie, Yoshiro*; Sugai, Isao*; Igarashi, Susumu*; Arakida, Yoshio*; Takeda, Yasuhiro*
Dai-14-Kai Kasokuki Kagaku Kenkyu Happyokai Hokokushu, p.637 - 639, 2003/00
Three charge-exchange foils are used in J-PARC 3GeV Synchrotron(RCS). One is used for changing H
to H by stripping electrons, and the others are used for changing H
and H to H which are failed to strip at the first foil. In this paper, we will describe the temperature distribution at the charge-exchange foils calculated by a simulation code 'ANSYS' where the particle distribution is based on a particle tracking code 'ACCSIM'.
Igarashi, Shinichi; Muto, Shunsuke*; Tanabe, Tetsuo*; Aihara, Jun; Hojo, Kiichi
Surface & Coatings Technology, 158-159, p.421 - 425, 2002/09
no abstracts in English
Morii, Yukio; Koike, Yoshihiro; Igarashi, Takeshi*; Kubota, Minoru*; Hiresaki, Yu*; Tanida, Koji*
Physica B; Condensed Matter, 284-288(Part2), p.2014 - 2015, 2000/07
Times Cited Count：0 Percentile：0(Physics, Condensed Matter)no abstracts in English
Koike, Yoshihiro; Morii, Yukio; Igarashi, Takeshi*; Kubota, Minoru*; Hiresaki, Yu*; Tanida, Koji*
Cryogenics, 39(7), p.579 - 583, 1999/00
Times Cited Count：22 Percentile：67.86(Thermodynamics)no abstracts in English
Koike, Yoshihiro*; Morii, Yukio; Igarashi, Takeshi*; Kubota, Minoru*; Hiresaki, Yu*; *
Proc. of Int. Cryogenic Engineering Conf. 1998 (ICEC17), p.263 - 266, 1998/00
no abstracts in English
Igarashi, Hiroshi; Kato, Ko; Takahashi, Takeshi
PNC TN8410 92-331, 1 Pages, 1992/12
Ruthenium tetroxide was generated and its absorption in condensation of steam was studied in the laboratory scale experiments. The results showed that the addition of No or NO into RuO promoted the absorption of ruthenium into water. The addition of NO in about 189 molar ratio of NO/RuO lowered gas/liquid ratio a for ruthenium to 1/168 in comparison with the test of no addition. The addition of NO in 22.2 molar ratio of NO/RuO decreased the ratio 
to 1/1180. The effect of NO or NO was explained by the experimental observation that NO or NO transformed the ruthenium tetroxide into nitro complex of nitrosylruthenium which is more absorbable into water and less volatile.
Masaki, Toshio; Igarashi, Hiroshi; Miyauchi, Tomoko*; Takahashi, Takeshi
Donen Giho, (84), p.60 - 64, 1992/12
None
Igarashi, Hiroshi; Takahashi, Takeshi
PNC TN8410 92-067, 1 Pages, 1992/03
A three-dimensional mathematical model was developed to simulate the operation of the electric glass melter used to vitrify high-level liquid waste from the reprocessing spent nuclear fuel. The model is formulated by four differential equations which are the conservation equations for electric charge. mass, energy and momentum transfer. The equations are solved by finite difference method for the three-dimensional gridwork of 323835 generated for both of complex refractory structure and molten glass in it under the boundary conditions similar to the real operational conditions. The melter for the simulation is approximately 1.61.61.6m in outer dimension and has a rectangular melting cavity with the melting surface area of 0.53m. The maximum heat generation was caused at the front of main plate electrodes. The vector profile of molten glass flow showed two circulation flows with an upward flow at the center of melter and a downward flow in front of the each main plate electrode. The transfer phenomena in the melter were well explained by the mathematical model. The computational temperature profiles were agreed with the operational data for the engineering scale melter which had complex structures.
Igarashi, Hiroshi; ; Takahashi, Takeshi
Radiochimica Acta, 57(1), p.51 - 55, 1992/00
None
Igarashi, Hiroshi; ; Takahashi, Takeshi
Radiochimica Acta, 29(6), p.576 - 581, 1992/00
None
; ; Igarashi, Hiroshi; Takahashi, Takeshi;
Waste Management, 12(1), p.7 - 16, 1992/00
; Kawamura, Kazuhiro; Takahashi, Takeshi
PNC TN8410 91-247, 29 Pages, 1991/12
The effects of noble metal elements such as ruthenium, rhodium and palladium on the viscosity and electrical resistivity of simulated nuclear waste glass were studied. The glass enriched with noble metals showed the viscosity of a non-Newtonian fluid. The viscosity of the waste g1ass with 10 wt% RuO was 3 to 7 times higher than that of glass without noble metals. The RuO was mainly responsible for the increase in viscosity for the glass enriched with noble metals. Electrical resistivity of the glass with 15 wt% RuO, was one seventh to two orders of magnitude lower than that of glass without noble metals. The three noble metals contributed to the decrease in resistivity. The quantitative effects of noble metals on these properties were obtained.
