Atmospheric radionuclides from the Fukushima Dai-ichi nuclear reactor accident observed in Vietnam.

Autor: Long NQ; Institute of Nuclear Science and Technology, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam., Truong Y, Hien PD, Binh NT, Sieu LN, Giap TV, Phan NT
Jazyk: angličtina
Zdroj: Journal of environmental radioactivity [J Environ Radioact] 2012 Sep; Vol. 111, pp. 53-8. Date of Electronic Publication: 2011 Dec 24.
DOI: 10.1016/j.jenvrad.2011.11.018
Abstrakt: Radionuclides from the reactor accident at the Fukushima Dai-ichi Nuclear Power Plant were observed in the surface air at stations in Hanoi, Dalat, and Ho Chi Minh City (HCMC) in Vietnam, about 4500 km southwest of Japan, during the period from March 27 to April 22, 2011. The maximum activity concentrations in the air measured at those three sites were 193, 33, and 37 μBq m(-3) for (131)I, (13)(4)Cs, and (13)(7)Cs, respectively. Peaks of radionuclide concentrations in the air corresponded to arrival of the air mass from Fukushima to Vietnam after traveling for 8 d over the Pacific Ocean. Cesium-134 was detected with the (134)Cs/(137)Cs activity ratio of about 0.85 in line with observations made elsewhere. The (131)I/(137)Cs activity ratio was observed to decrease exponentially with time as expected from radioactive decay. The ratio at Dalat, where is 1500 m high, was higher than those at Hanoi and HCMC in low lands, indicating the relative enrichment of the iodine in comparison to cesium at high altitudes. The time-integrated surface air concentrations of the Fukushima-derived radionuclides in the Southeast Asia showed exponential decrease with distance from Fukushima.
(Copyright © 2011 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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