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C collected by precipitation and gas-strip methods for dating groundwaterNakata, Kotaro*; Hasegawa, Takuma*; Iwatsuki, Teruki; Kato, Toshihiro
Radiocarbon, 58(3), p.491 - 503, 2016/09
Times Cited Count：5 Percentile：21.03(Geochemistry & Geophysics)Dissolved inorganic carbon (DIC) for C analysis of groundwater is usually extracted by a gas-strip or precipitation method. In this study, the certainty of the two methods for C dating were confirmed. DIC and C concentrations obtained by the gas-strip method were close to the theoretically predicted C value. Conversely, the C value obtained by the precipitation method always showed higher values than the predicted values. The difference in C value between gas-strip and precipitation methods was assumed to arise owing to contamination of modern carbon used in the precipitation method. The applicability of the precipitation method for groundwater should be considered carefully according to the DIC, C concentration of groundwater and purpose of the study being conducted.
Kitamura, Toshikatsu; Kabuto, Shoji*; Suzuki, Takashi; Amano, Hikaru; Kitada, Yoshinobu*; Watanabe, Yukiya*
Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.52 - 55, 2004/12
no abstracts in English
C, and its application to surface and soil airAmano, Hikaru; Koma, T.*; Atarashi-Andoh, Mariko; Koarashi, Jun; Iida, Takao*
Journal of Radioanalytical and Nuclear Chemistry, 252(2), p.353 - 357, 2002/00
Times Cited Count：6 Percentile：39.3(Chemistry, Analytical)no abstracts in English
Uwaba, Tomoyuki; Mizuta, Shunji;
JNC TN9400 2000-028, 41 Pages, 2000/03
JNC-TN9400-2000-028.pdf:2.52MB
14Cr-25Ni optimized advanced austenic steels have been developed to improve the swelling resistance of 15Cr-20Ni austenic stainless steels used for FBR fuel cladding. ln this improvement, Ti,Nb,V and P were dissolved into 14Cr-25Ni marix by means of the high-temperature solution treatment to make finely distributed and stabilized precipitates in the operation. Furthermore, at the final stage of cold-working, cold-working level increased and residual stress was reduced. ln this study, as fablicated microstructure observation, solubility of alloying elements and grain size test in the manufacturing process were evaluated. Following results were obtained. (1)Spherical precipitates were observed in the grain. Most of them were identified as conjugated carbo-nitride [Ti,Nb(C,N)] by EDX analysis. (2)The dissolved percentages of Ti and Ni in the matrix were about 70% and 30% respectively. Undissoved Ti and Nb may react with undissolved carbon and precipitate as MC carbides. (3)High-temperature solution treatment is effective for the sufficient solubility of alloying elements, but it is likely to induce very large grains, which is the cause of defective signal in the ultrasonic alloy testing. The results of the grain size test showed that the large grain size is reduced in low Nb (0.1wt%) alloy compared with the standard alloy (0.2wt%Nb), and the effectiveness for the grain size control by reducing the Nb content was confirmed. Also, it was suggested that the intermediate heat treatment and cold work conditions would possibly avoid the occurrence of the large grain at the final heat treatment.
C on soil samples collected at Rokkasho-muraOgawa, Hiromichi; Nagao, Seiya; *
JAERI-Research 96-004, 11 Pages, 1996/02
JAERI-Research-96-004.pdf:0.5MB
no abstracts in English
Asano, Yoshihiro; Sasamoto, Nobuo
Radiation Physics and Chemistry, 44(1-2), p.133 - 137, 1994/00
Times Cited Count：16 Percentile：78.44(Chemistry, Physical)no abstracts in English
Nakata, Kotaro*; Hasegawa, Takuma*; Iwatsuki, Teruki; Kato, Toshihiro
no journal, ,
C concentration in dissolved inorganic carbon is available index to infer groundwater residence time. We confirmed precision and accuracy during DIC collection methods such as degassing and precipitation by using NaHCO
solution and natural groundwater.
Okuno, Mitsuru*; Nagaoka, Shinji*; Kokubu, Yoko; Nakamura, Toshio*; Kobayashi, Tetsuo*
no journal, ,
Kuju Volcanic Group, located in middle Kyushu, Japan, consists of lava domes and small stratovolcanoes. We present here results of AMS C dating of pyroclastic flow deposits (Pfl) on southern slope of the Kuju Volcanic Group. The C dating has conducted by AMS (JAEA-AMS-TONO) under the Common-Use Facility Program of JAEA. The Handa Pfl was the biggest eruption during the last 200 kyrs and the AMS C age was about 54 kBP. Shirani Pfl and Muro Pfl are block-and ash flow type and the C ages were 48 kBP and 41 kBP, 32 - 34 kBP, respectively. These ages can be correlated with Thermoluminescence ages for lava domes of Kutsukake-yama and Hossho-zan. This study demonstrates that the lava dome and block-and ash flow deposits formed at the summit area after the eruption of Handa Pfl.
Iwatsuki, Teruki; Kato, Toshihiro; Nakata, Kotaro*; Hasegawa, Takuma*
no journal, ,
Water chemistry, isotopes and chlorofluorocarbons in groundwater down to a depth of 500 m were monitored in the Mizunami Underground Research Laboratory (MIU), Japan. The monitoring of water chemistry for more than 10 years shows the increase of shallow water infiltration in UHFD at depths between 200 - 400 m. Based on 3H and CFCs concentrations the mixing proportion of shallow groundwater was estimated up to about 50 %. On the other hand groundwater in LSFD at the depth of 500 m was identified relatively isolated condition from the hydraulic disturbance by the facility construction. The residence time of the isolated groundwater was estimated 18 - 25 ka by C.
Hayakawa, Tsubasa*; Katsuta, Nagayoshi*; Kokubu, Yoko; Hasebe, Noriko*; Murakami, Takuma; Miyata, Yoshiki*; Hasegawa, Hitoshi*; Nagao, Seiya*; Kawakami, Shinichi*
no journal, ,
no abstracts in English
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro; Iwatsuki, Teruki; Kato, Toshihiro*; Hayashida, Kazuki
no journal, ,
Groundwater dating was conducted to Mizunami Underground Research Laboratory (MIU). C age and 
He age were estimated about 20,000 years around MIU. The estimation of noble gas temperature is also conducted. The estimated recharge temperature is around 6
C. This temperature is about 9C cooler than present annual average temperature, which agree with estimation of modern analog method conducted near MIU.
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Okamoto, Shunichi*; Hama, Katsuhiro; Watanabe, Yusuke; Iwatsuki, Teruki
no journal, ,
no abstracts in English
