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Journal Articles

Cesium, iodine and tritium in NW Pacific waters; A Comparison of the Fukushima impact with global fallout

Povinec, P. P.*; Aoyama, Michio*; Biddulph, D.*; Breier, R.*; Buesseler, K. O.*; Chang, C. C.*; Golser, R.*; Hou, X. L.*; Je$v{s}$kovsk$'y$, M.*; Jull, A. J. T.*; et al.

Biogeosciences, 10(8), p.5481 - 5496, 2013/08

 Times Cited Count:81 Percentile:95.22(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 $$^{134}$$Cs, $$^{137}$$Cs, $$^{129}$$I and $$^{3}$$H. The $$^{137}$$Cs, $$^{129}$$I and $$^{3}$$H levels in surface seawater offshore Fukushima varied between 0.002-3.5 Bq/L, 0.01-0.8 $$mu$$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 $$^{137}$$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.

Journal Articles

Radiation effect of low energy electron beam on plant growth

Takeshita, Hidefumi; Pham, T. L. H.*; Yoshii, Fumio; Kume, Tamikazu

Shokuhin Shosha, 35(1-2), p.59 - 63, 2000/09

no abstracts in English

Journal Articles

Isovector giant resonances in $$^{6}$$He, $$^{12}$$B, $$^{90}$$Y, $$^{120}$$In and $$^{208}$$Tl observed in the ($$^{7}$$Li, $$^{7}$$Be) charge-exchange reaction

Annakkage, T.*; J$"a$necke, J.*; Winfield, J. S.*; Berg, G. P. A.*; Brown, J. A.*; Gawley, G. A.*; Danczyk, S.*; Fujiwara, Mamoru; Mercer, D. J.*; Pham, K.*; et al.

Nuclear Physics A, 648(1-2), p.3 - 44, 1999/03

 Times Cited Count:21 Percentile:46.05(Physics, Nuclear)

no abstracts in English

Oral presentation

Radiation-induced crosslinking of polysaccharide derivatives; The Control of the gelation by changing irradiation temperature-p

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 $$^{circ}$$C were determined. The more pronounced gelation was occurred in lower temperature region of -78 to 0 $$^{circ}$$C when compared to the other region of 0 to 70 $$^{circ}$$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.

Oral presentation

Radiation-induced crosslinking of cellulose derivatives; Crosslinking control by irradiation temperature

Nagasawa, Naotsugu; Pham, T. L. H.*; Yagi, Toshiaki; Tamada, Masao

no journal, , 

no abstracts in English

Oral presentation

Preparation of blend hydrogels based on cellulose- and starch-derivatives and their properties

Pham, H. T. T.*; Hiroki, Akihiro; Nagasawa, Naotsugu; Tamada, Masao

no journal, , 

no abstracts in English

Oral presentation

Biodegradability of the carboxymethyl cellulose and carboxymethyl starch blend hydrogels prepared by using the $$gamma$$-irradiation technique

Hiroki, Akihiro; Pham, H. T. T.*; Nagasawa, Naotsugu; Tamada, Masao

no journal, , 

no abstracts in English

Oral presentation

Biodegradability of blend hydrogels based on carboxymethyl cellulose and carboxymethyl starch

Hiroki, Akihiro; Pham, T. T. H.*; Nagasawa, Naotsugu; Tamada, Masao

no journal, , 

no abstracts in English

Oral presentation

Study of $$^{249}$$Cf by Coulomb excitation gamma-ray spectroscopy

Pham, T. T.*; Yanagihara, Rikuto*; Ideguchi, Eiji*; Orlandi, R.; Nishio, Katsuhisa; Makii, Hiroyuki; Asai, Masato; Hirose, Kentaro; Tsukada, Kazuaki; Toyoshima, Atsushi*; et al.

no journal, , 

Oral presentation

Study of $$^{249}$$Cf by Coulomb excitation gamma-ray spectroscopy

Pham, T. T.; Yanagihara, Rikuto*; Ideguchi, Eiji*; Orlandi, R.; Nishio, Katsuhisa; Makii, Hiroyuki; Hirose, Kentaro; Asai, Masato; Tsukada, Kazuaki

no journal, , 

Oral presentation

Isomer spectroscopy using actinide targets

Sugiyama, Koichi*; Go, Shintaro*; Tomimatsu, Taro*; Kai, Tamito*; Nagae, Daisuke*; Ishibashi, Yuichi*; Matsunaga, Sotaro*; Nagata, Yuto*; Nishibata, Hiroki*; Washiyama, Kohei*; et al.

no journal, , 

We have successfully performed in-beam gamma-ray spectroscopy using the isomer-scope technique to study excited-state structure of neutron-rich heavy-actinide nuclei. The neutron-rich heavy-actinide nuclei were produced in the multinucleon-transfer reactions with a $$^{248}$$Cm target and $$^{18}$$O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-$$Delta$$E telescopes placed at the backward angle, and target-like scattered particles of isomers were caught by an annular aluminum plate placed at about 60-mm downstream from the target. Four Ge detectors and 4 LaBr detectors were placed at the periphery of the aluminum plate, and detected gamma rays from the isomers. Gamma rays emitted from the actinide isomers were successfully observed with a good sensitivity owing to the tungsten shield placed between the target and the detectors.

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