Search Results - "Mahara, Y."

Removal of radioactive cesium, strontium, and iodine from natural waters using bentonite, zeolite, and activated carbon by Kubota, T., Fukutani, S., Ohta, T., Mahara, Y.

“…Cs-134, Sr-85, and I-131 were produced by neutron irradiation of CsCl, SrCl 2 , and K 2 TeO 3 , respectively, using the Kyoto University Reactor. These…”
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Separation of dissolved Kr from a water sample by means of a hollow fiber membrane by Ohta, T., Mahara, Y., Momoshima, N., Inoue, F., Shimada, J., Ikawa, R., Taniguchi, M.

“…We investigated extraction of the krypton (Kr) radioisotope 85Kr from groundwater having an ultra-low concentration with a Kr extraction system using an…”
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Stable carbon isotope behaviour of natural seepage of deep underground 13C-rich methane detected along a fault zone and adsorbed in mudstone: Tokyo Bay area, Japan by Nakata, E., Tanaka, S., Suenaga, H., Mahara, Y., Nakamura, T., Nakagawa, K., Ohta, T.

“…Gas was sampled regionally, including by drilling into faults, in the South Kanto gas-field around Tokyo Bay, Japan. Gas samples were collected from cores in a…”
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Separation and measurement of 129I and 127I in pre-nuclear-era marine algae with ultra-low 129I/127I isotopic ratios by Ohta, T., Mahara, Y., Kubota, T., Abe, T., Matsueda, H., Tokunaga, T., Sekimoto, S., Takamiya, K., Fukutani, S., Matsuzaki, H.

“…The iodine isotopes 127I and 129I were isolated from marine algal samples to obtain 129I/127I ratios by accelerator mass spectrometry (AMS). The collection…”
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Effects of molecular weight of natural organic matter on cadmium mobility in soil environments and its carbon isotope characteristics by Mahara, Y., Kubota, T., Wakayama, R., Nakano-Ohta, T., Nakamura, T.

“…We investigated the role of natural organic matter in cadmium mobility in soil environments. We collected the dissolved organic matter from two different types…”
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Application of 85Kr dating to groundwater in volcanic aquifer of Kumamoto Area, Japan by Momoshima, N., Inoue, F., Ohta, T., Mahara, Y., Shimada, J., Ikawa, R., Kagabu, M., Ono, M., Yamaguchi, K., Sugihara, S., Taniguchi, M.

“…Groundwater age was determined by 85 Kr/Kr specific activity of gases dissolved in groundwater at Kumamoto Area, in which newly developed Kr extraction system…”
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Groundwater dating by estimation of groundwater flow velocity and dissolved 4He accumulation rate calibrated by 36Cl in the Great Artesian Basin, Australia by Mahara, Y., Habermehl, M.A., Hasegawa, T., Nakata, K., Ransley, T.R., Hatano, T., Mizuochi, Y., Kobayashi, H., Ninomiya, A., Senior, B.R., Yasuda, H., Ohta, T.

“…We tested two methods for dating groundwaters that cannot be reliably measured by 36Cl dating alone, one based on groundwater flow velocity plus distance along…”
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Isotopic investigations for the origin of relic from the Matsusaki site, Japan by Nakano-Ohta, T., Kubota, T., Ando, A., Fujii, T., Fukutani, S., Nakata, E., Nakano, T., Mahara, Y.

“…We measured the environmental radioactivity and isotope ratio, 87Sr/ 86Sr ratio, 234U/ 238U, δ 13C, and 228Ra/ 226Ra activity ratio, of adhesion that adhered…”
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New dating method: Groundwater residence time estimated from the 4He accumulation rate calibrated by using cosmogenic and subsurface-produced 36Cl by Mahara, Y., Ohta, T., Kubota, T., Miyakawa, K., Hasegawa, T., Habermehl, M. A., Fifield, L. K.

“…Groundwater contains dissolved He, and its concentration increases with the residence time of the groundwater. Thus, if the 4He accumulation rate is constant,…”
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Comparison of 36Cl measurements at three laboratories around the world by Mahara, Y, Ito, Y, Nakamura, T, Kudo, A

“…To verify groundwater dating using 36Cl, we confirmed the precision of 36Cl measurements by comparing three laboratories that have routinely measured 36Cl…”
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Plutonium mass balance released from the Nagasaki A-Bomb and the applicability for future environmental research by Kudo, A., Mahara, Y., Santry, D.C., Suzuki, T., Miyahara, S., Sugahara, M., Zheng, J., Garrec, J-P.

“…The existence of plutonium was publicly revealed on 9 August 1945 by the nuclear explosion of the Nagasaki A-Bomb whose Pu critical mass has been considered to…”
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Global transport rates of 137Cs and 239+240Pu originating from the Nagasaki A-bomb in 1945 as determined from analysis of Canadian Arctic ice cores by Kudo, A., Zheng, J., Koerner, R.M., Fisher, D.A., Santry, D.C., Mahara, Y., Sugahara, M.

“…Recent advancements in analytical technology make it possible for artificial radionuclides released from nuclear explosions to be detected in Arctic ice core…”
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Plutonium in tree rings from France and Japan by Garrec, J.-P., Suzuki, T., Mahara, Y., Santry, D.C., Miyahara, S., Sugahara, M., Zheng, J., Kudo, A.

“…Plutonium, along with other radionuclide concentrations, was measured in evergreen tree rings from two different locations. This was used as an information…”
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Comparison of 36Cl measurements at three laboratories around the world by MAHARA, Y

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Fate of Plutonium Released from the Nagasaki A-Bomb, Japan by Kudo, A, Mahara, Y, Kauri, T, Santry, D C

“…About 15 kg of plutonium was used in the Nagasaki A-bomb, but only 1 kg was fissioned and the rest (14 kg) was released into the environment. The fate of this…”
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Affects of molecular size of natural organic matters for cadmium mobility in soil environments by Mahara, Y., Kubota, T., Wakayama, R.

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Isolation of folic acid-producing microalgae and their potential for biotechnological applications by Fujii, K., Nakashima, H., Hashizume, Y., Mahara, Y.

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Groundwater dating by estimation of groundwater flow velocity and dissolved (4)He accumulation rate calibrated by (3(6Cl in the Great Artesian Basin, Australia by Mahara, Y, Habermehl, M A, Hasegawa, T, Nakata, K, Ransley, T R, Hatano, T, Mizuochi, Y, Kobayashi, H, Ninomiya, A, Senior, B R, Yasuda, H, Ohta, T

“…We tested two methods for dating groundwaters that cannot be reliably measured by (3(6Cl dating alone, one based on groundwater flow velocity plus distance…”
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Groundwater dating by estimation of groundwater flow velocity and dissolved super(4)He accumulation rate calibrated by super(3) super(6)Cl in the Great Artesian Basin, Australia by Mahara, Y, Habermehl, MA, Hasegawa, T, Nakata, K, Ransley, T R, Hatano, T, Mizuochi, Y, Kobayashi, H, Ninomiya, A, Senior, B R, Yasuda, H, Ohta, T

“…We tested two methods for dating groundwaters that cannot be reliably measured by super(3) super(6)Cl dating alone, one based on groundwater flow velocity plus…”
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Structure analysis of 1×1 Cu layer formed on Mo(1 1 0) surface by Kawanowa, H., Suzuki, J., Mahara, Y., Gotoh, Y., Souda, R.

“…The surface structure, epitaxial orientation relationship, and adsorption site for Cu deposited on Mo(1 1 0) surface were studied by reflection high-energy…”
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