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Miura, Hikaru*; Kuribara, Yuichi; Yamamoto, Masayoshi*; Sakaguchi, Aya*; Yamaguchi, Noriko*; Sekizawa, Oki*; Nitta, Kiyofumi*; Higaki, Shogo*; Tsumune, Daisuke*; Itai, Takaaki*; et al.
Scientific Reports (Internet), 10, p.11421_1 - 11421_9, 2020/07
Times Cited Count：18 Percentile：67.97(Multidisciplinary Sciences)
pre-concentration of Sr from large volume of freshwater sample using Powdex resinTomita, Jumpei; Yamamoto, Masayoshi*; Nozaki, Teo; Tanimura, Yoshihiko*; Oishi, Tetsuya
Journal of Environmental Radioactivity, 146, p.88 - 93, 2015/08
Times Cited Count：12 Percentile：34.88(Environmental Sciences)Yamamoto, Masayoshi*; Tomita, Jumpei
Onsen Kagaku, 64(4), p.388 - 401, 2015/03
no abstracts in English
Yoshimura, Kazuya; Onda, Yuichi*; Sakaguchi, Aya*; Yamamoto, Masayoshi*; Matsuura, Yuki*
Journal of Environmental Radioactivity, 139, p.370 - 378, 2015/01
Times Cited Count：86 Percentile：92.39(Environmental Sciences)Endo, Satoru*; Tomita, Jumpei*; Tanaka, Kenichi*; Yamamoto, Masayoshi*; Fukutani, Satoshi*; Imanaka, Tetsuji*; Sakaguchi, Aya*; Amano, Hikaru; Kawamura, Hidehisa*; Kawamura, Hisao*; et al.
Radiation and Environmental Biophysics, 47(3), p.359 - 365, 2008/07
Times Cited Count：5 Percentile：20.97(Biology)Dolon village located about 60 km from the border of the Semipalatinsk Nuclear Test Site is known to be heavily contaminated by the first USSR atomic bomb test in August 1949. Soil samples around Dolon were taken in October 2005 in an attempt to evaluate internal thyroid dose arising from incorporation of radioiodine isotopes (mainly 
I). Iodine-129 in soil was measured by using the technique of Accelerator Mass Spectrometry. From the relationship between 
I and 
Cs (corrected for background and decay from 1949 to 2005) accumulated levels, the background level of I and the I/Cs ratio around Dolon were estimated to be (6.4 
0.4) 
10
atoms m
and 0.25 0.16, respectively. This I/Cs ratio is almost similar to the fission yield ratio for 
Pu fast fission (0.24).
Shima, Shigeki*; Gasa, Shinichi*; Amano, Hikaru; Nagao, Seiya*; Yamamoto, Masayoshi*; Momoshima, Noriyuki*; Furukawa, Masahide*; Kimura, Hideki*; Kawamura, Hisao*
JAEA-Conf 2008-003, p.28 - 31, 2008/04
Concentrations of I in surface seawater around Japan were approximately 210
atoms/L in literatures. However, the atomic ratio of iodine to cesium was ten times as high as that of the global fallout. The origin of I in the water columns seems to be difficult to be explained by only the global fallout. Discharge from European plants was one of the possible origins of iodine from the standpoint of air mass trajectory analysis. Concentration of I in rain water was 10 times higher than that in surface seawater. Anthropogenic inorganic iodine in surface seawater predominantly dissolves as an iodide ion (I
).
Nagao, Seiya; Yanase, Nobuyuki; Yamamoto, Masayoshi*; Kofuji, H.*; Sorin, Yoshiki*; Amano, Hikaru
Journal of Radioanalytical and Nuclear Chemistry, 252(2), p.225 - 232, 2002/05
Times Cited Count：9 Percentile：51.38(Chemistry, Analytical)no abstracts in English
Yamamoto, M.*; *; Amano, Hikaru
JAERI-Review 95-024, 69 Pages, 1996/02
JAERI-Review-95-024.pdf:1.91MB
no abstracts in English
Yoshida, Keisuke*; Inoue, Mutsuo*; Minakawa, Masayuki*; Nakano, Yusuke*; Kofuji, Hisaki*; Otosaka, Shigeyoshi; Kiyomoto, Yoko*; Shiomoto, Akihiro*; Hamajima, Yasunori*; Yamamoto, Masayoshi*
no journal, ,
The authors have developed an analytical method for Th-228, Ra-226 and Ra-228 measurements in seawater using an ultra-low background 
-ray detector. In this study, the authors measured the three radionuclides in surface seawater obtained from 16 stations in the Japan Sea, East China Sea and Okhotsk Sea. Concentrations of Ra-228 and Th-228 in surface waters in the southern Japan Sea were lower than those in the northern regions. Considering that the Th-228/Ra-228 activity ratios were not different between the northern and southern regions of the Japan Sea, we could conclude that (1) input of terrestrial materials from the East China Sea has not affected the distribution of the radionuclides in the Japan Sea, and (2) the efficiency of scavenging was not different between the regions.
Taniguchi, Keisuke*; Yoshimura, Kazuya; Smith, H.*; Blake, W.*; Yamamoto, Masayoshi*; Yokoyama, Akihiko*; Takahashi, Yoshio*; Sakaguchi, Aya*; Onda, Yuichi*
no journal, ,
no abstracts in English
Taniguchi, Keisuke*; Yoshimura, Kazuya; Smith, H.*; Blake, W.*; Takahashi, Yoshio*; Sakaguchi, Aya*; Yamamoto, Masayoshi*; Onda, Yuichi*
no journal, ,
no abstracts in English
Tomita, Jumpei; Abe, Takuya; Sakaguchi, Aya*; Miyata, Yoshiki*; Nagao, Seiya*; Yamamoto, Masayoshi*
no journal, ,
no abstracts in English
Tomita, Jumpei; Miyata, Yoshiki*; Hama, Katsuhiro; Sakaguchi, Aya*; Nagao, Seiya*; Yamamoto, Masayoshi*
no journal, ,
no abstracts in English
Miura, Hikaru*; Kuribara, Yuichi; Yamamoto, Masayoshi*; Sakaguchi, Aya*; Higaki, Shogo*; Takahashi, Yoshio*
no journal, ,
A synchrotron radiation X-ray analysis was performed on radioactive particles released into the environment due to the Fukushima Dai-ichi Nuclear Power Plant accident, uranium particles (4 valence and 6 valence) with a size of several microns were present in the particles from the Unit 1. Since these uranium particles also contain zirconium, which is considered to be derived from the fuel cladding, it was presumed that the eutectic mixture of the fuel in the reactor and its cladding was incorporated into the radioactive particulates and released into the environment.
