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Kataoka, Noriaki*; Nakajima, Junya; Miwa, Kazuji; Hirota, Seiko*; Tsubota, Yoichi; Yamada, Ryohei; Fujimichi, Yuki*; Ishikawa, Junya*; Sunaoshi, Masaaki*
Hoken Butsuri (Internet), 54(2), p.140 - 145, 2019/06
It is the written report of the joint meeting of young researchers in the field of radiation protection and radiation biology.
Ebihara, Kenichi; Iwamoto, Takashi*; Miwa, Noriaki*; Yamada, Hiroki*; Okamura, Tsukasa*; Urushihara, Wataru*; Omura, Tomohiko*
"Suiso Zeika Kenkyu No Kiban Kochiku" Kenkyukai Hokokusho, p.21 - 26, 2013/10
In order to explore the properly hydrogen-charging method for the estimation of hydrogen embrittlement of steels, in the workshop of Fundamental construction for hydrogen embrittlement supported by the Iron and Steel Institute of Japan of which I took part for understanding the mechanism of hydrogen embrittlement which is one cause of stress corrosion cracking, the thermal desorption spectrum of hydrogen and the amount of charged hydrogen were estimated among various kinds of steels charged with hydrogen by various methods. The presentation is a part of a series of the final report about the results obtained in the workshop. In the presentation, I talk about the numerical estimation of the desorption spectrum of low alloy steel mainly on the basis of the paper which is going to be published in the ISIJ International. Particularly, the kind of defects in the steel that capture hydrogen forming the spectrum and the experimental method for identifying the defects are explained in details.
Yoneyama, Kai*; Sato, Isamu*; Hagura, Naoto*; Furuya, Noriaki*; Miwa, Shuhei; Suzuki, Eriko
no journal, ,
In order to clarify the Cs penetration behavior into concrete, the Cs penetration tests from low-concentration Cs solution into aggregate, mortar and concrete was carried out. The concentrations of penetrated Cs along the depth from surface were analyzed using INAA. At the depths deeper than 0.5 mm, the concentration of Cs in concrete was higher than the total concentration of Cs in aggregate and mortar. This result has been shown also in the previous penetration tests using more high-concentration Cs solution. These are considered to be occurred because interface of aggregates and mortar would promote the penetration of Cs.
Furuya, Noriaki*; Sato, Isamu*; Hagura, Naoto*; Yoneyama, Kai*; Miwa, Shuhei; Suzuki, Eriko
no journal, ,
In order to develop an analysis technique of penetrated Cs into concrete, the concentration of penetrated Cs into bulk concretes and bulk mortars were quantitatively analyzed using PIXE. The results of concentration decrease along the depth from surface proved the applicability of PIXE to the quantitative analyses of low-concentration Cs in bulk samples. This can reduce experimental errors and contribute to a detailed estimation of Cs penetration behavior.
Furuya, Noriaki*; Sato, Isamu*; Hagura, Naoto*; Yoneyama, Kai*; Miwa, Shuhei; Suzuki, Eriko
no journal, ,
In order to develop an analysis technique of penetrated Cs into concrete, the concentration of penetrated Cs into bulk concretes and bulk mortars were quantitatively analyzed using PIXE. The difference of penetration depth between concretes and mortars, which has been observed also in the Cs penetration tests using more high-concentration Cs solutions, was observed. These results showed the applicability of PIXE to the quantitative analyses of low-concentration Cs in bulk samples.
