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Journal Articles

Development of radiation-resistant optical fiber for application to observation and laser spectroscopy under high radiation dose

Ito, Chikara; Naito, Hiroyuki; Nishimura, Akihiko; Oba, Hironori; Wakaida, Ikuo; Sugiyama, Akira; Chiyatani, Keiji

Journal of Nuclear Science and Technology, 51(7-8), p.944 - 950, 2014/07

 Times Cited Count:27 Percentile:90.9(Nuclear Science & Technology)

In the Fukushima Daiichi Nuclear Power Station, it is necessary to survey the locations and conditions of fuel debris inside reactor pressure vessels or primary containment vessels under water and radiation environment in preparation for removing fuel debris. An optical fiber is well known for features such as signal transmission, light weight, superior insulation performance, water resistance and electromagnetic noise resistance. These features allow the optical fiber to simplify the instrumentation systems for in-vessel inspection, as long as provide that the optical fiber can be used under high radiation dose environment. The radiation resistance of an optical fiber was improved by increasing the amount of hydroxyl up to 1000 ppm in pure silica fiber. The improved optical fibers were irradiated with $$gamma$$-ray up to 1 $$times$$ 10$$^{6}$$ Gy using a $$^{60}$$Co source. They indicated a large peak around 600 nm and a peak tail from ultraviolet region, but no large absorption in infrared region except a hydroxyl absorption peak of 945 nm. We have confirmed that the optical fiber containing 1000 ppm hydroxyl has enough radiation resistance for radiation induced transmission losses and the infrared imaging is effective for observation under high radiation doses.

Journal Articles

Non-dimensional transport scaling and its correlation with local transport properties in JT-60U plasmas

Shirai, Hiroshi; Takizuka, Tomonori; Kikuchi, Mitsuru; Mori, Masahiro; Nishitani, Takeo; Ishida, Shinichi; Kamada, Yutaka; Sato, Masayasu; Isei, Nobuaki; Koide, Yoshihiko; et al.

IAEA-CN-60/A2-17, 0, p.355 - 364, 1995/00

no abstracts in English

Journal Articles

High sensitivity dosimetry by $$^{1}$$$$^{4}$$CO$$_{2}$$

; *; *; *; ; *; *; Naito, Keiji

Chemistry Letters, 1973(9), p.1015 - 1016, 1973/09

no abstracts in English

JAEA Reports

Properties and Structures of Uranium Oxides with Emphasis on Nonstoichiometry

*; Naito, Keiji

JAERI 4045, 30 Pages, 1968/03

JAERI-4045.pdf:1.98MB

no abstracts in English

Journal Articles

Thermal conductivity of nuclear fuel ceramics at high temperatures

Naito, Keiji

Yogyo Kyokia-Shi, 75(862), p.163 - 174, 1967/06

no abstracts in English

Journal Articles

Acid and base; A general introduction

Naito, Keiji;

Denki Kagaku, 35, p.319 - 330, 1967/00

no abstracts in English

Journal Articles

Preparation of thorium carbides

; *; Naito, Keiji

J.Am.Ceram.Soc., 50(6), p.308 - 311, 1967/00

 Times Cited Count:6

no abstracts in English

Journal Articles

The role of chemistry and industrial chemistry in atomic energy industry

Naito, Keiji

Kagaku Kyoiku, 15(3), p.305 - 315, 1967/00

no abstracts in English

Journal Articles

X-ray study on a phase transition of U$$_{4}$$O$$_{9}$$

Naito, Keiji;

Solid State Communications, 5, p.349 - 352, 1967/00

 Times Cited Count:28

no abstracts in English

Journal Articles

Evaporation of metals and ceramics

Naito, Keiji

Nihon Kinzoku Gakkai Kaiho, 5(3), p.159 - 172, 1966/00

no abstracts in English

Journal Articles

Study on U$$_{4}$$O$$_{9}$$, 1; An Anomaly of the heat capacity near the room temperature

Naito, Keiji; *

Journal of Physics and Chemistry of Solids, 26(11), p.1673 - 1677, 1965/00

 Times Cited Count:21

no abstracts in English

Journal Articles

Study on U$$_{4}$$O$$_{9}$$, 2; Magnetic suscepribility of U$$_{4}$$O$$_{9}$$

Naito, Keiji; *; *

Journal of Physics and Chemistry of Solids, 25(11), p.1679 - 1684, 1965/00

no abstracts in English

JAEA Reports

Helium purification system of High Temperature Gas-cooled Reactor

; ; *; Naito, Keiji; *; *; *

JAERI 1051, 51 Pages, 1964/01

JAERI-1051.pdf:2.66MB

no abstracts in English

Journal Articles

Relocation of fission products and Pu in irradiated UO$$_{2}$$ pellet

Naito, Keiji; Noboru Oi*; Tadao Ohno*

Journal of Nuclear Science and Technology, 1(8), p.284 - 289, 1964/00

no abstracts in English

JAEA Reports

Purification of Helium Coolant

*; Naito, Keiji; *

JAERI 4025, 38 Pages, 1963/11

JAERI-4025.pdf:1.99MB

no abstracts in English

Journal Articles

The Mechanism of the extraction of several proton acids by tri-n-butyl phosphate

Naito, Keiji;

J.Phys.Chem., 66(6), p.983 - 988, 1962/00

no abstracts in English

Journal Articles

The Mechanism of the extraction of several uranyl salts by tri-n-butyl phosphate

Naito, Keiji;

J.Phys.Chem., 66(6), p.989 - 995, 1962/00

no abstracts in English

Journal Articles

Study on the preparation of uranium carbides

Naito, Keiji; *; *

Nihon Genshiryoku Gakkai-Shi, 4(11), p.754 - 758, 1962/00

no abstracts in English

Journal Articles

Determination of enthalpy change oxidation reaction of uranium dioxide by D.T.A.

; Naito, Keiji; *

Nihon Genshiryoku Gakkai-Shi, 4(2), p.111 - 117, 1962/00

no abstracts in English

JAEA Reports

Technical aspects of aqueous homogeneous reactor

Sugimoto, Asao; Takeda; Furuhashi, Akira; Katsuragi, Satoru; Hirota, Jitsuya; Naito, Keiji; Kondo, Yasuko; Nagasaki, Ryukichi; Yamazaki, Yasaburo; Kuroi, Hideo; et al.

JAERI 4018, 52 Pages, 1961/06

JAERI-4018.pdf:4.14MB

no abstracts in English

27 (Records 1-20 displayed on this page)