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Journal Articles

$$^{14}$$C ages and calendar years of Japanese nails measured with accelerator mass spectrometry

Nagata, Kazahiro*; Furunushi, Yasuko*; Matsubara, Akihiro*; Kokubu, Yoko; Nakamura, Toshio*

Tetsu To Hagane, 105(4), p.488 - 491, 2019/04

 Times Cited Count:1 Percentile:9.85(Metallurgy & Metallurgical Engineering)

The Japanese nails had been produced by the traditional ironmaking way of Tatara until the Edo period since the late of 6 Century. The quality of the Japanese nails is affected from steel produced by Tatara in each age. The $$^{14}$$C ages of 3 Japanese nails collected at shrines and temples at their repair were measured with accelerator mass spectrometry and calibrated to calendar years. Each $$^{14}$$C age provided plural calendar year periods with definite probabilities, and one of the periods determined in comparison with the history of temples and their repair records. The production ages of nails used in the Daibutuden of the Todaiji temple, the living quarters of the Manjuin temple and the Zaoudo of the Yoshino-Kongoji temple are before 1692, the 12 Century and before 1592, respectively, when they were repaired or reconstructed.

Journal Articles

$$^{14}$$C ages and calendar years of Japanese swords measured with accelerator mass spectrometry

Nagata, Kazahiro*; Matsubara, Akihiro*; Kokubu, Yoko; Nakamura, Toshio*

Tetsu To Hagane, 102(12), p.736 - 741, 2016/12

 Times Cited Count:2 Percentile:14.84(Metallurgy & Metallurgical Engineering)

Steel of Japanese swords has been produced with Tatara process from iron sand and charcoal. Carbon dissolved in steel was absorbed from wooden charcoal fuel at the production of the steel. From the decay of $$^{14}$$C activity in the steel, the $$^{14}$$C age of Japanese sword can be determined. The $$^{14}$$C ages of 4 Japanese swords were calibrated to a few calendar years. There are several generations of the same names of sword masters. The year of production of each sword was determined from the calendar year and the sword master's name cut in the grip of his sword after taking the age of charcoal into account. The oldest calendar year with high probability agreed with the age of sword master.

JAEA Reports

Perform Test of a Directional Borehole Rader

Nagata, Kazuhiro*; Kajikawa, Kazahiro*; Mizuochi, Yukihiro*

JNC TJ7420 2003-001, 51 Pages, 2003/02

JNC-TJ7420-2003-001.pdf:4.8MB

Directional borehole rader (DBRD) measurements and core description were carried out and the reliability of fracture orientations determined by DBRD was discussed. DBRD ran into the borehole (01MS-06, depth 400m) drilled at the Syobasama site and 17 fractures were detected. 10 fracture orientations were determined from those fractures. Reflection waves from amother borehole (MIU-2) located about 14m away from 01MS-06 borehole were not detected, so the reliability of orientation could not be evaluated quantitatively. Judging from the result of a laboratory experiment, wa conclude that the error of fracture orientations determined by DBRD, in case of clearly observed reflector planes, would be within the range of plusmn 10 deg. in this work. Comparing DBRD reflector plane with fractures obtained by the core logging, it is found that the reflection occurs from fractured zone of rock mass. DBRD measurements with directional antennas having sufficient resolution are applicable to ...

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