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.*; Jekovsk, M.*; Jull, A. J. T.*; et al.

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

https://doi.org/10.5194/bg-10-5481-2013

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.

Isovector giant resonances in He, B, Y, In and Tl observed in the (Li, Be) charge-exchange reaction

Annakkage, T.*; Jnecke, 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

https://doi.org/10.1016/S0375-9474(99)00015-9

no abstracts in English

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

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

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

no journal, , 

no abstracts in English

Study of 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, , 

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 Cm target and O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-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.