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Journal Articles

Thermally altered subsurface material of asteroid (162173) Ryugu

Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.

Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03

 Times Cited Count:30 Percentile:96.87(Astronomy & Astrophysics)

Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 $$^{circ}$$C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 $$^{circ}$$C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.

Journal Articles

Radionuclide release to stagnant water in the Fukushima-1 Nuclear Power Plant

Nishihara, Kenji; Yamagishi, Isao; Yasuda, Kenichiro; Ishimori, Kenichiro; Tanaka, Kiwamu; Kuno, Takehiko; Inada, Satoshi; Goto, Yuichi

Journal of Nuclear Science and Technology, 52(3), p.301 - 307, 2015/03

 Times Cited Count:17 Percentile:81.3(Nuclear Science & Technology)

After the severe accident at the Fukushima-1 nuclear power plant, large amounts of contaminated stagnant water have accumulated in turbine buildings and their surroundings. This rapid communication reports calculation of the radionuclide inventory in the core, collection of measured inventory in the stagnant water, and estimation of radionuclide release ratios from the core to the stagnant water. This evaluation is based on data obtained before June 3, 2011. The release ratios of tritium, iodine, and cesium were several tens of percent, whereas those of strontium and barium were smaller by one or two orders of magnitude. The release ratios in the Fukushima accident were equivalent to those in the TMI-2 accident.

Journal Articles

Radionuclide release to stagnant water in Fukushima-1 Nuclear Power Plant

Nishihara, Kenji; Yamagishi, Isao; Yasuda, Kenichiro; Ishimori, Kenichiro; Tanaka, Kiwamu; Kuno, Takehiko; Inada, Satoshi; Goto, Yuichi

Nihon Genshiryoku Gakkai Wabun Rombunshi, 11(1), p.13 - 19, 2012/03

After the severe accident in the Fukushima-1 Nuclear Power Plant, large amount of contaminated stagnant water has been produced in turbine buildings and those surroundings. This rapid communication reports calculation of radionuclide inventory in the core, collection of measured inventory in the stagnant water, and estimation of radionuclide release ratios from the core to the stagnant water. The present evaluation is based on data obtained before June 3, 2011.

Journal Articles

Radioactive waste management in Japan 1955$$sim$$75

Ishihara, Takehiko

Genshiryoku Kogyo, 21(10), p.1 - 5, 1975/10

no abstracts in English

JAEA Reports

Glossary for Nuclear Materials Management and Safeguards,Supplement

; Ishihara, Takehiko

JAERI-M 4751, 82 Pages, 1972/03

JAERI-M-4751.pdf:2.22MB

no abstracts in English

JAEA Reports

Glossary for Nuclear Material Management and Safeguards

; Ishihara, Takehiko

JAERI-M 4497, 38 Pages, 1971/07

JAERI-M-4497.pdf:1.0MB

no abstracts in English

Journal Articles

Decomposition of cyclohexyl amines through irradiation

; Ishihara, Takehiko;

Journal of Nuclear Science and Technology, 4(6), p.317 - 318, 1967/00

no abstracts in English

Journal Articles

Effect of temperature on the extraction of nitric acid, uranium and fission products with tri-n-octyl amine

; Ishihara, Takehiko

Journal of Nuclear Science and Technology, 4(7), p.353 - 360, 1967/00

 Times Cited Count:6

no abstracts in English

Journal Articles

Extraction of nitric acid and uranyl nitrate by trioctylamine

; ; Ishihara, Takehiko

Kogyo Kagaku Zasshi, 70(5), p.622 - 628, 1967/00

no abstracts in English

Journal Articles

Infra-red spectrophotometry of uranyl nitrate/tri-n-butyl phosphate in organic solvents

; Ishihara, Takehiko

Journal of Inorganic and Nuclear Chemistry, 28(10), p.2343 - 2345, 1966/00

 Times Cited Count:7

no abstracts in English

Journal Articles

Chemical degration of kerosene diluent with nitric acid

Ishihara, Takehiko;

Journal of Nuclear Science and Technology, 3(1), p.20 - 26, 1966/00

no abstracts in English

Journal Articles

The Effect of hydrogen bond formation between tri-n-butyl phosphate and carboxylic acid on uranium distribution

Ishihara, Takehiko;

Journal of Nuclear Science and Technology, 3(2), p.67 - 71, 1966/00

no abstracts in English

Journal Articles

Radiation damage to TBP/kerosene solvent, 2; Effect on extraction behavior of uranium and thorium and on their loading effect

; Ishihara, Takehiko

Journal of Nuclear Science and Technology, 3(4), p.144 - 149, 1966/00

 Times Cited Count:16

no abstracts in English

Journal Articles

On Fission product retention of degraded kerosene with nitric acid

Ishihara, Takehiko;

Journal of Nuclear Science and Technology, 3(6), p.243 - 248, 1966/00

no abstracts in English

Journal Articles

Changes to plutonium extraction behavior of TBP and alkylamines through irradiation

; Ishihara, Takehiko

Journal of Nuclear Science and Technology, 3(8), p.320 - 325, 1966/00

 Times Cited Count:19

no abstracts in English

Journal Articles

Treatment practices of low and intermediate level radioactive wastes at the Japan Atomic Energy Research Institute

Ishihara, Takehiko;

Practices in the Treatment of Low- and Intermediate-Level Radioactive Wastes(IAEA), p.207 - 222, 1966/00

no abstracts in English

Journal Articles

Present state of reprocessing research in the third Geneva conference papers

Ishihara, Takehiko

Genshiryoku Kogyo, 11(2), p.61 - 64, 1965/00

no abstracts in English

Journal Articles

Reprocessing of power reactor fuels

Ishihara, Takehiko

Genshiryoku Kogyo, 11(8), p.36 - 40, 1965/00

no abstracts in English

Journal Articles

Radiation damage to amine extractants, 2; Effect on extraction behavior of thorium and protactium

Ishihara, Takehiko;

Journal of Nuclear Science and Technology, 2(11), p.463 - 467, 1965/00

 Times Cited Count:7

no abstracts in English

47 (Records 1-20 displayed on this page)