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Ninomiya, Kazuhiko*; Kubo, Kenya*; Inagaki, Makoto*; Yoshida, Go*; Chiu, I.-H. ; Kudo, Takuto*; Asari, Shunsuke*; Sentoku, Sawako*; Takeshita, Soshi*; Shimomura, Koichiro*; et al.
Scientific Reports (Internet), 14, p.1797_1 - 1797_8, 2024/01
Times Cited Count：0 Percentile：0.08(Multidisciplinary Sciences)The amount of C in steel, which is critical in determining its properties, is strongly influenced by steel production technology. We propose a novel method of quantifying the bulk C content in steel non-destructively using muons. This revolutionary method may be used not only in the quality control of steel in production, but also in analyzing precious steel archaeological artifacts. A negatively charged muon forms an atomic system owing to its negative charge, and is finally absorbed into the nucleus or decays to an electron. The lifetimes of muons differ significantly, depending on whether they are trapped by Fe or C atoms, and identifying the elemental content at the muon stoppage position is possible via muon lifetime measurements. The relationship between the muon capture probabilities of C/Fe and the elemental content of C exhibits a good linearity, and the C content in the steel may be quantitatively determined via muon lifetime measurements. Furthermore, by controlling the incident energies of the muons, they may be stopped in each layer of a stacked sample consisting of three types of steel plates with thicknesses of 0.5 mm, and we successfully determined the C contents in the range 0.20 - 1.03 wt% depth-selectively, without sample destruction.
Hakozaki, Masataka*; Sakamoto, Minoru*; Kokubu, Yoko; Fujita, Natsuko; Li, Z.*; Nakatsuka, Takeshi*
no journal, ,
The sacred tree, a large cedar tree, at the Zinmei Shrine in Mizunami City, Gifu Prefecture was collapsed by heavy rain. Using a part of the tree, we have started measuring its radiocarbon in order to obtain the basic data of calibration curve required for radiocarbon dating. In this presentation, we report the result of age determination of the tree.
Kokubu, Yoko; Hakozaki, Masataka*; Sakamoto, Minoru*; Li, Z.*; Nakatsuka, Takeshi*; Fujita, Natsuko
no journal, ,
no abstracts in English
C measurement of 670-year-old giant Japanese cedar - 1871-2020 CESakamoto, Minoru*; Hakozaki, Masataka*; Fujita, Natsuko; Kokubu, Yoko
no journal, ,
On July 11, 2020, a giant Japanese cedar in the precincts of the Okute Shinmei Shrine in Okute-cho, Mizunami City, Gifu Prefecture, collapsed due to heavy rain. The main trunk of the tree had 415 tree rings. At the National Museum of Japanese History (NMJH), the butt end of the tree was cut into strips and bleached to obtain cellulose in the form of plates. The cellulose was separated yearly, graphitized, and measured for radiocarbon by AMS at the Tono Geoscience Center of the Japan Atomic Energy Agency (JAEA).
