Refine your search:     
Report No.
 - 
Search Results: Records 1-4 displayed on this page of 4
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Cross-checking groundwater age by $$^{4}$$He and $$^{14}$$C dating in a granite, Tono area, central Japan

Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Goto, Kazuyuki*; Kashiwaya, Koki*; Hama, Katsuhiro; Iwatsuki, Teruki; Kunimaru, Takanori*; Takeda, Masaki

Geochimica et Cosmochimica Acta, 192, p.166 - 185, 2016/11

 Times Cited Count:9 Percentile:35.91(Geochemistry & Geophysics)

Groundwater dating was performed simultaneously by the $$^{4}$$He and $$^{14}$$C methods in granite of the Tono area in central Japan. Groundwater was sampled at 30 packed-off sections of six 1000-m boreholes. $$^{4}$$He concentrations increased and $$^{14}$$C concentrations decreased along a groundwater flow path on a topographic gradient. $$^{4}$$He ages were calculated by using the in situ $$^{4}$$He production rate derived from the porosity, density, and U and Th content of the rock, neglecting external flux. The linear relation between the $$^{4}$$He ages and the noncorrected $$^{14}$$C ages, except in the discharge area. Simultaneous measurements make it feasible to estimate the accumulation rate of $$^{4}$$He and initial dilution of $$^{14}$$C, which cannot be done with a single method. Cross-checking groundwater dating has the potential to provide more reliable groundwater ages.

Journal Articles

Design of a 500kV electron gun for ERL light source at KEK

Yamamoto, Masahiro*; Honda, Yosuke*; Miyajima, Tsukasa*; Uchiyama, Takashi*; Kobayashi, Masanori*; Muto, Toshiya*; Matsuba, Shunya*; Sakanaka, Shogo*; Sato, Kotaro*; Saito, Yoshio*; et al.

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.860 - 862, 2009/08

A newly 500 kV electron gun (2nd - 500 kV gun) for an ERL light source is designed at KEK. A new concept and state of-the-art technologies of vacuum system, ceramic insulators, high voltage power supply, photocathode and preparation system will be employed. The details are described in this report.

Oral presentation

Analysis and prediction of microstructure of heat resistant steels based on system free energy

Murata, Yoshinori*; Shiraki, Atsuhiro*; Takeda, Kotaro*; Tsukada, Yuki*; Saito, Yoshihiro*; Morinaga, Masahiko*; Koyama, Toshiyuki*; Takaya, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Activity report of the emergency monitoring committee

Hosoda, Masahiro*; Saito, Kimiaki; Mikami, Satoshi; Sanada, Tetsuya*; Omori, Yasutaka*; Takeda, Hikaru*; Yamada, Takahiro*; Hirao, Shigekazu*; Tani, Kotaro*; Orita, Makiko*; et al.

no journal, , 

no abstracts in English

4 (Records 1-4 displayed on this page)
  • 1