著者

永田 和宏 古主 泰子 松原 章浩 國分(齋藤) 陽子 中村 俊夫

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.105, no.4, pp.488-491, 2019 (Released:2019-03-31)

参考文献数

16

被引用文献数

1 1

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The Japanese nails had been produced by the traditional ironmaking way of Tatara until the Edo period since the late of 6 Century. The Tatara is characterized as the ironmaking using very fine iron sand as the resources and is distinguished from the pre-modern ironmaking way in Europe using lump iron ore. The quality of the Japanese nails is affected from steel produced by Tatara in each age. The 14C ages of 3 Japanese nails were measured with accelerator mass spectrometry and calibrated to calendar years. Each 14C 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 Manshuin temple and the Zaoudo of the Yoshino-Kinpusenji temple are before 1692, the 12 Century and before 1592, respectively, when they were repaired or reconstructed.

著者

片岡 由行 森川 敦史 古主 泰子 牧田 正弘 吉永 亨二 木戸 直範

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.105, no.5, pp.560-565, 2019 (Released:2019-04-30)

参考文献数

4

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An accurate quantitative analysis method including total iron had been proposed for the iron ore analysis by wavelength dispersive X-ray fluorescence spectrometry using fusion method and was accepted at ISO TC 102 meeting in 2010. The project has been proceeded in ISO TC 102/SC 2/WG54 as ISO/WD 9516-2 project. Number of covered elements is 19, and 14 elements among them including total iron are for referee analysis. The calibration discs are prepared only from reagents and the calibration equation includes coexisting component correction, overlap correction, flux/sample and oxidizer/sample mixing ratio corrections. The coexisting component correction method is based on the absorption/enhancement correction coefficients obtained by a FP (fundamental parameter) method so that LOI (loss on ignition) and GOI (gain on ignition) during fusion do not affect to analyzed results. In the verification experiments with 20 certified reference materials, the accuracy obtained by root mean square of the difference between certified values and analyzed values using proposed method was 0.14 mass%, which indicated analytical accuracy could be greatly improved compared with the existing method. For the other components, the values of accuracy obtained were almost same as the existing method. We are conducting final round-robin test in foreign laboratories and have a plan to set the method as an ISO standard.