Anthropogenic I-129 in the North Pacific, Bering and Chukchi Seas, and Arctic Ocean in 2012-2013

作者：Nagai H^*; Hasegawa A; Yamagata T; Kumamoto Y; Nishino S; Matsuzaki H

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2015, 361: 680-684.

DOI：10.1016/j.nimb.2015.07.119

• I-129
• Seawater
• North Pacific
• Chukchi Sea
• Arctic Ocean

Most of anthropogenic I-129 in marine environment are due to discharge from the nuclear fuel reprocessing facilities at Sellafield (U.K.) and La Hague (France) for past few decades. The discharge raised I-129 concentration in seawaters in the North Atlantic and Arctic Oceans to more than 10(9) atoms L-1, which is two orders of magnitude higher than that in other region. Recently, in March 2011, a large quantity of I-129 was released into the western North Pacific due to the Fukushima Daiichi Nuclear Power Plant (F1NPP) accident. To evaluate the influence of these events, we have measured I-129 concentration in seawaters in the northern North Pacific Ocean, Bering and Chukchi Seas, and Arctic Ocean in 2012-2013. The I-129 concentrations were 1.0-1.8 x 10(7) atoms L-1 in the surface waters in the vicinity of 47 degrees N 150 degrees E-130 degrees W North Pacific Ocean, Bering Sea, and Chukchi Sea (<74 degrees N), which are equal to or lower than the I-129 concentration level in surface water in the North Pacific Ocean before the F1NPP accident. The vertical profiles in the North Pacific were almost same as that observed in the western North Pacific before the F1NPP accident. The I-129 distribution in seawater in the North Pacific to the Chukchi Sea revealed no significant increase of I-129 concentration caused by the F1NPP accident. The I-129 concentrations were 13-14 x 10(7) atoms L-1 in surface waters and 80 x 10(7) atoms L-1 at depths of 300 and 800 m in the Arctic Ocean.

• 出版日期2015-10-15