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Futemma, Akira; Sanada, Yukihisa; Nagakubo, Azusa; Kawasaki, Yoshiharu*; Iwai, Takeyuki*; Hiraga, Shogo*; Haginoya, Masashi*; Matsunaga, Yuki*; Akutsu, Yuichiro*; Arai, Yoshinori*; et al.
JAEA-Technology 2023-027, 146 Pages, 2024/03
JAEA-Technology-2023-027.pdf:18.12MB
By the accident at Tokyo Electric Power Company's (TEPCO's) Fukushima Daiichi Nuclear Power Station (FDNPS), caused by tsunami triggered by the 2011 off the Pacific coast of Tohoku Earthquake, a large amount of radioactive material was released into the surrounding environment. After the accident, Airborne Radiation Monitoring (ARM) via manned helicopter has been applied as a method to quickly and extensively measure the distribution of radiation. Japan Atomic Energy Agency (JAEA) has continuously conducted ARM via manned helicopter around FDNPS. In this report, we summarize the results of the ARM around FDNPS in the fiscal year 2022, evaluate the changes of ambient dose rates and other parameters based on the comparison to the past ARM results, and discuss the causes of such changes. In order to contribute to improve the accuracy of ambient dose rate conversion, we analyzed the ARM data taking into account undulating topography, and evaluated the effect of this method. Furthermore, the effect of radon progenies in the air on the ARM was evaluated by applying the discrimination method to the measurement results.
Duan, Z.*; Yang, Z.*; Hoshino, Daiki*; Hirao, Toshio; Taguchi, Mitsumasa; Ouchi, Hirokuni*; Yanagi, Yuichiro*; Nishioka, Yasushiro*
Molecular Crystals and Liquid Crystals, 567(1), p.28 - 33, 2012/09
Times Cited Count：3 Percentile：42.67(Chemistry, Multidisciplinary)
-Conjugated polymers and oligomers are of interest for applications to organic light emitting diodes, solar cells, and organic field effect transistors because of their unique photo-electronic properties. Thienyl-dibenzothiophene oligomers end-capped by hexylphenyl groups, 2,8-bis[5-(4-n-hexylphenyl)-2-thienyl]dibenzothiophene and 3,7-bis[5-(4-nhexylphenyl)-2-thienyl]dibenzothiophene, were synthesized by Stille cross-coupling reactions. The photo-physical and electrochemical properties of the synthesized oligomers were investigated by Ultraviolet-visible and photoluminescence spectroscopy, cyclic voltammogram, and thermal analyses, and showed appropriate energy band gaps and low HOMO energy levels. The synthesized oligomers are promising candidate materials for durable organic electronic devices.
-ray irradiated organic thin film transistors based on perfluoropentacene with polyimide gate insulatorTakayanagi, Yutaro*; Ouchi, Hirokuni*; Duan, Z.*; Okukawa, Takanori*; Yanagi, Yuichiro*; Yoshida, Akira*; Taguchi, Mitsumasa; Hirao, Toshio; Nishioka, Yasushiro*
Journal of Photopolymer Science and Technology, 25(4), p.493 - 496, 2012/08
Times Cited Count：0 Percentile：0.01(Polymer Science)Organic thin film fields effect transistors are expected to be used in spacecrafts/satellites because they can realize large-size, mechanical flexibility, light weight and low-cost devices. N-channel field effect transistors with a Si/polyimide(PI)/perfluoropentacene/Au structure were fabricated, and irradiated with -ray from Co source. The changes of the drain current vs. source/drain voltage characteristics were measured after every 200 Gy in silicon Gy(Si) irradiations up to the total dose of 1200 Gy(Si). The drain current gradually increased up to the total dose of 1200 Gy(Si). The threshold voltage decreased up to 400 Gy(Si), and gradually recovered above 600 Gy(Si). The mobility was almost unchanged up to 1200 Gy(Si). Those behaviors were explained by accumulation of positive trapped charge within the gate insulator PI near the interface. Evidence for the accumulation of interface traps was hardly observed.
Asami, Itsuo*; Fukuta, Shiro*; Kuroyanagi, Satoru*; Oya, Toshio*; Hase, Yoshihiro; Yokota, Yuichiro; Narumi, Issei
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 80, 2008/03
no abstracts in English
Hanawa, Satoshi; Sato, Tomonori; Mori, Yuichiro; Ogiyanagi, Jin; Kaji, Yoshiyuki; Uchida, Shunsuke
Journal of Power and Energy Systems (Internet), 1(2), p.123 - 133, 2007/00
In order to evaluate the water chemistry in the irradiation field during IASCC irradiation test, a water radiolysis code for IASCC irradiation loop system was developed. In the water radiolysis code, a multiple node model was introduced since the irradiation loop system has a wide rage temperature distribution as well as the dose distribution. To investigate the applicability of developed water radiolysis code, water chemistry at the water sampling point of the irradiation loop system was measured and compared with analytical results under several water chemistry conditions. Further, water chemistry distribution in the in-pile region as well as in the out-pile region was calculated by the developed water radiolysis code.
Hanawa, Satoshi; Sato, Tomonori; Mori, Yuichiro; Ogiyanagi, Jin; Kaji, Yoshiyuki; Uchida, Shunsuke*
Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 9 Pages, 2006/07
no abstracts in English
Hanawa, Satoshi; Ogiyanagi, Jin; Mori, Yuichiro*; Saito, Junichi; Tsukada, Takashi
JAEA-Conf 2006-003, p.350 - 357, 2006/05
no abstracts in English
Mori, Yuichiro*; Hanawa, Satoshi; Sato, Tomonori; Ogiyanagi, Jin; Nabeya, Hideaki; Uchida, Shunsuke*
no journal, ,
no abstracts in English
Hanawa, Satoshi; Ogiyanagi, Jin; Sato, Tomonori; Mori, Yuichiro*; Miwa, Yukio; Uchida, Shunsuke*
no journal, ,
no abstracts in English
Asami, Itsuo*; Fukuta, Shiro*; Kuroyanagi, Satoru*; Oya, Toshio*; Hase, Yoshihiro; Yokota, Yuichiro; Narumi, Issei
no journal, ,
no abstracts in English
