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Povinec, P. P.*; Aoyama, Michio*; Biddulph, D.*; Breier, R.*; Buesseler, K. O.*; Chang, C. C.*; Golser, R.*; Hou, X. L.*; Je
kovsk
, M.*; Jull, A. J. T.*; et al.
Biogeosciences, 10(8), p.5481 - 5496, 2013/08
Times Cited Count：101 Percentile：94.61(Ecology)Radionuclide impact of the Fukushima Dai-ichi Nuclear Power Plant accident on the distribution of radionuclides in seawater of the NW Pacific Ocean is compared with global fallout from atmospheric tests of nuclear weapons. Surface and water column seawater samples collected during the international expedition in June 2011 were analyzed for 
Cs, 
Cs, 
I and 
H. The Cs, I and H levels in surface seawater offshore Fukushima varied between 0.002-3.5 Bq/L, 0.01-0.8 
Bq/L, and 0.05-0.15 Bq/L, respectively. At the sampling site about 40 km from the coast, where all three radionuclides were analyzed, the Fukushima impact on the levels of these three radionuclides represent an increase above the global fallout background by factors of about 1000, 30 and 3, respectively. The water column data indicate that the transport of Fukushima-derived radionuclides downward to the depth of 300 m has already occurred. The observed Cs levels in surface waters and in the water column are in reasonable agreement with predictions obtained from the Ocean General Circulation Model, which indicates that the radionuclides have been transported from the Fukushima coast eastward. Due to a suitable residence time in the ocean, Fukushima-derived radionuclides will provide useful tracers for isotope oceanography studies on the transport of water masses in the NW Pacific Ocean.
Takeshita, Hidefumi; Pham, T. L. H.*; Yoshii, Fumio; Kume, Tamikazu
Shokuhin Shosha, 35(1-2), p.59 - 63, 2000/09
no abstracts in English
Nagasawa, Naotsugu; Yagi, Toshiaki; Tamada, Masao; Pham, T. L. H.*
no journal, ,
Recently, we have reported the synthesis of hydrogels of polysaccharide derivatives such as carboxymethylcellulose (CMC), carboxymethylchitin, etc., by radiation-induced crosslinking methods. Control of gelation of polysaccharide derivatives by radiation is very important factor for various applications. It was investigated that control temperature during irradiation affects on crosslinking behavior of CMC. The gel fraction and swelling of CMC gel after irradiation at temperature of -78 to 70 
C were determined. The more pronounced gelation was occurred in lower temperature region of -78 to 0 C when compared to the other region of 0 to 70 C. It found that gelation could be controlled by changing temperature at the time of the irradiation when it was made to put a polysaccharide derivative such as CMCT and CMS on the crosslinking with the radiation and gel was formed.
Nagasawa, Naotsugu; Pham, T. L. H.*; Yagi, Toshiaki; Tamada, Masao
no journal, ,
no abstracts in English
