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Journal Articles

Interfacial distribution of Nafion ionomer thin films on nitrogen-modified carbon surfaces

Yoshimune, Wataru*; Kikkawa, Nobuaki*; Yoneyama, Hiroaki*; Takahashi, Naoko*; Minami, Saori*; Akimoto, Yusuke*; Mitsuoka, Takuya*; Kawaura, Hiroyuki*; Harada, Masashi*; Yamada, Norifumi*; et al.

ACS Applied Materials & Interfaces, 14(48), p.53744 - 53754, 2022/11

https://doi.org/10.1021/acsami.2c14574
 Times Cited Count：6 Percentile：59.75(Nanoscience & Nanotechnology)

Journal Articles

Comparison of liquid scintillation counting measurement with accelerator mass spectrometric measurement

Yamada, Yoshimune*; Yasuike, Kaeko*; Amano, Hikaru

JAEA-Conf 2008-003, p.59 - 62, 2008/04

https://jopss.jaea.go.jp/pdfdata/JAEA-Conf-2008-003.pdf

Concentrations of organically-bound $$^{14}$$C in the tree-ring cellulose samples were analyzed by the accelerator mass spectrometric measurement (hereafter the AMS measurement) and compared with those of the same samples by the liquid scintillation counting measurement (hereafter the LSC measurement). This was done to determine the reliability of LSC measurement. An important result is that the $$Delta$$$$^{14}$$C values analyzed by the AMS measurement demonstrated lower levels of approximately 15permil than those by the LSC measurement. These deviations are considered to be caused by indeterminate errors in the counting of the specific activity of the standard reference of $$^{14}$$C used for the LSC measurement. The synthesized benzene prepared from NIST oxalic acid (SRM4990C) was used as the standard reference of $$^{14}$$C in the LSC measurement.

Oral presentation

Determination of $$^{14}$$C in environmental samples by accelerator mass spectrometry

Yasuike, Kaeko*; Yamada, Yoshimune*; Amano, Hikaru

no journal, , 

Two methods are usually used for the determination of $$^{14}$$C in environmental samples. One is a traditional method by counting $$beta$$ rays emitted from individual carbon atoms using a gas proportional counter or a liquid scintillation counter. This method suffers from the defect that a large amount of sample and a long time counting must be needed for the accurate determination of $$^{14}$$C. The other is the accelerator mass spectrometry (AMS) method, which has an advantage that the number of $$^{14}$$C atoms can be counted directly in a few milligrams of carbon. In this study, a promising process utilizing AMS method for the determination of $$^{14}$$C was investigated, and the same process was applied to a Japanese Cedar grown in Kanazawa, Ishikawa prefecture, Japan, (36.5$$^{circ}$$N, 136.7$$^{circ}$$E) to determine the past distribution of $$^{14}$$C isotopic abundance in environmental samples.

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