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Hashimoto, Shoji*; Tanaka, Taku*; Komatsu, Masabumi*; Gonze, M.-A.*; Sakashita, Wataru*; Kurikami, Hiroshi; Nishina, Kazuya*; Ota, Masakazu; Ohashi, Shinta*; Calmon, P.*; et al.
Journal of Environmental Radioactivity, 238-239, p.106721_1 - 106721_10, 2021/11
Times Cited Count：11 Percentile：56.59(Environmental Sciences)This study was aimed at analysing performance of models for radiocesium migration mainly in evergreen coniferous forest in Fukushima, by inter-comparison between models of several research teams. The exercise included two scenarios of countermeasures against the contamination, namely removal of soil surface litter and forest renewal, and a specific konara oak forest scenario in addition to the evergreen forest scenario. All the models reproduced trend of time evolution of radiocesium inventories and concentrations in each of the components in forest such as leaf and organic soil layer. However, the variations between models enlarged in long-term predictions over 50 years after the fallout, meaning continuous field monitoring and model verification/validation is necessary.
Morita, Takami*; Niwa, Kentaro*; Fujimoto, Ken*; Kasai, Hiromi*; Yamada, Haruya*; Nishiuchi, Ko*; Sakamoto, Tatsuya*; Godo, Waichiro*; Taino, Seiya*; Hayashi, Yoshihiro*; et al.
Science of the Total Environment, 408(16), p.3443 - 3447, 2010/06
Times Cited Count：13 Percentile：33(Environmental Sciences)Iodine-131 (
I) was detected in brown algae collected off the Japanese coast. The maximum measured specific activity of I in brown algae was 0.37
0.010 Bq/kg-wet. Cesium-137 (
Cs) was also detected in all brown algal samples used in this study. There was no correlation between specific activities of I and Cs in these seaweeds. Low specific activity and minimal variability of Cs in brown algae indicated that past nuclear weapon tests were the source of Cs. Although nuclear power facilities are known to be pollution sources of I, there was no relationship between the sites where I was detected and the locations of nuclear power facilities. Most of the sites where I was detected were near big cities with large populations. On the basis of the results, we suggest that the likely pollution source of I, detected in brown seaweeds, is not nuclear power facilities, but nuclear medicine procedures.
Masuda, Takatsugu*; Kitaoka, Shuji*; Takamizawa, Satoshi*; Metoki, Naoto; Kaneko, Koji; Rule, K. C.*; Kiefer, K.*; Manaka, Hiroshi*; Nojiri, Hiroyuki*
Physical Review B, 81(10), p.100402_1 - 100402_4, 2010/00
Times Cited Count：42 Percentile：81.37(Materials Science, Multidisciplinary)Spin dynamics of the square lattice Heisenberg antiferromagnet, Ba
MnGeO
, is studied by a combination of bulk measurements, neutron diffraction, and inelastic neutron-scattering techniques. Easy plane type antiferromagnetic order is identified at T
4.0 K. The exchange interactions are estimated as 
= 27.8(3) 
eV and
= 1.0(1) eV, and the saturation field 
is 9.75 T. Magnetic excitation measurements with high experimental resolution setup by triple axis neutron spectrometer reveals the instability of one magnon excitation in the field range of 0.7 
0.85.
with addition of 9% AmMiwa, Shuhei; Osaka, Masahiko; Yoshimochi, Hiroshi; Tanaka, Kenya; Kurosaki, Ken*; Uno, Masayoshi*; Yamanaka, Shinsuke*
Journal of Alloys and Compounds, 444-445, p.610 - 613, 2007/10
Times Cited Count：14 Percentile：61.53(Chemistry, Physical)no abstracts in English
on phase relationOsaka, Masahiko; Miwa, Shuhei; Yoshimochi, Hiroshi; Tanaka, Kenya; Kurosaki, Ken*; Yamanaka, Shinsuke*
Recent Advances in Actinide Science, p.406 - 408, 2006/06
Phase relation of (U,Pu,Am)O solid solution was experimentally investigated by using XRD, ceramograhy and DTA. It is concluded from the present investigation that Am is likely to exist as fixed valences of Am
and corresponding amount of U
is substituted by the U
for the preservation of electrical neutrarity.
Kuroda, Masatoshi*; Yamanaka, Shinsuke*; Nagase, Fumihisa; Uetsuka, Hiroshi
Nuclear Engineering and Design, 203(2-3), p.185 - 194, 2001/01
Times Cited Count：14 Percentile：68.97(Nuclear Science & Technology)no abstracts in English
Kuroda, Masatoshi*; Yoshioka, Kunihiko*; Yamanaka, Shinsuke*; Anada, Hiroyuki*; Nagase, Fumihisa; Uetsuka, Hiroshi
Journal of Nuclear Science and Technology, 37(8), p.670 - 675, 2000/08
no abstracts in English
Am
)OMiwa, Shuhei; Osaka, Masahiko; Mondo, Kenji; Ishi, Yohei; Yoshimochi, Hiroshi; Tanaka, Kenya; Seki, Takayuki*; Sekine, Shinichi*; Kurosaki, Ken*; Uno, Masayoshi*; et al.
no journal, ,
An experimental investigation on phase relation of (PuAm)O was carried out by X-ray diffraction (XRD) analysis, ceramography and Differential Thermal Analysis (DTA) for (PuAm)O having different O/M ratios from 1.90 to 2.00.
Suzuki, Tetsuya*; Yamanaka, Keisuke*; Ishino, Mayuko*; Xu, P. G.; Suzuki, Hiroshi
no journal, ,
no abstracts in English
Suzuki, Tetsuya*; Yamanaka, Keisuke*; Nagai, Kensuke*; Tsuru, Eiji*; Xu, P. G.; Suzuki, Hiroshi
no journal, ,
no abstracts in English
Hashimoto, Shoji*; Tanaka, Taku*; Komatsu, Masabumi*; Gonze, M.-A.*; Sakashita, Wataru*; Kurikami, Hiroshi; Nishina, Kazuya*; Ota, Masakazu; Ohashi, Shinta*; Calmon, P.*; et al.
no journal, ,
We applied modelling approaches to evaluate the past and future dynamics of Cs in forests. In the model inter-comparison exercise using Fukushima data, six models with diverse model structures, processes, parameters and numerical approaches joined this exercise and the performance and uncertainties of the state-of-the-art models were explored. The inter-comparison revealed that, after appropriate calibration, the models reproduced the observed data reliably and the ranges of calculated trajectories were narrow in the early phase after the fallout. However, the envelope of the calculated model end points enlarged in long-term simulations over 50 years after the fallout. The model-inter comparison exercise emphasizes the importance of decadal data for various forest types and repetitive verification/validation processes using holistic, long-term data to improve the models and to update the forecasting capacity of the models.
