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Kinoshita, Norikazu*; Nagaoka, Mika; Nakanishi, Takashi*
Science of the Total Environment, 753, p.142087_1 - 142087_10, 2021/01
Times Cited Count:1 Percentile:65.97(Environmental Sciences)The distribution of the anthropogenic radionuclide americium-241 (Am), a decay product of
Pu discharged from atmospheric tests of nuclear weapons, was investigated to resolve its horizontal and vertical migration in the Tropical East Pacific. We analyzed
Am concentrations in seawater samples collected in 2003. On comparing the
Am concentrations with the previously determined concentrations of
Pu in the same samples, the vertical profiles of
Am were found to be similar to those of
Pu. At some stations, the maximum concentration of
Am occurred 100-200 m deeper than that of
Pu. The
Am/
Pu ratios in the North Pacific and South Pacific were comparable to one another, and were typical of the ratio for the Pacific. The
Am distribution was influenced by the water mass at depths below 400 m. The
Am data support the view there is a current flowing at depths of 400-3000 m from the North Pacific through the equator to the South Pacific. In addition, the
Am vertical profile was explained by using a box model that considers the decay of
Pu and adsorption and scavenging by suspended particles. The different depths for the maximum concentrations of
Am and
Pu observed at some stations were well explained by the model and by the distribution of CaCO
particles. The residence time of
Am in the Pacific was also estimated by using the model.
Terada, Kazushi*; Kimura, Atsushi; Nakao, Taro*; Nakamura, Shoji; Mizuyama, Kazuhito*; Iwamoto, Nobuyuki; Iwamoto, Osamu; Harada, Hideo; Katabuchi, Tatsuya*; Igashira, Masayuki*; et al.
Journal of Nuclear Science and Technology, 55(10), p.1198 - 1211, 2018/10
Times Cited Count:10 Percentile:87.34(Nuclear Science & Technology)Nakamura, Shoji; Terada, Kazushi; Takahashi, Yoshiyuki*; Sano, Tadafumi*; Hori, Junichi*
KURRI Progress Report 2015, P. 69, 2016/08
Neutron capture cross section measurements has been conducted for Minor Actinides (MAs) under the research project entitled by "Research and development for Accuracy Improvement of neutron nuclear data on Minor ACtinides (AIMAC)". The present work selected two americium isotopes, Am and
Am, were selected, and measurements were carried out by an activation method with neutron sources at KURRI-Linac. It was found that the neutron flux at the target positon was of the order of 10
(n/cm
s). The reaction rates of
Am and
Am were obtained by
- and
-ray measurements of the irradiated Am samples.
Nakagawa, Tsuneo
Journal of Nuclear Science and Technology, 42(11), p.984 - 993, 2005/11
Times Cited Count:8 Percentile:51.68(Nuclear Science & Technology)no abstracts in English
Kikuchi, Yasuyuki
JAERI-M 82-096, 103 Pages, 1982/08
no abstracts in English
;
Journal of Nuclear Science and Technology, 9(4), p.237 - 240, 1972/04
no abstracts in English
; Hiroyuki Tamura*; Yoshifumi Sakurai*
Journal of Nuclear Science and Technology, 1(3), p.101 - 107, 1964/00
no abstracts in English
; ;
Journal of Nuclear Science and Technology, 1(6), p.197 - 202, 1964/00
no abstracts in English