Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(3): 115-123 (2019)

資料Materials (Data)

青森県太平洋沿岸における129I濃度分布と水塊との関係The Relationship between Distribution of 129I Concentration and Water Masses off the Pacific Coast in Aomori Prefecture, Japan

公益財団法人日本海洋科学振興財団むつ海洋研究所Japan Marine Science Foundation ◇ 035–0064 青森県むつ市港町4番24号 ◇ 4–24 Minato-Machi, Mutsu, Aomori 035–0064, Japan

受付日:2018年8月17日Received: August 17, 2018
受理日:2018年10月5日Accepted: October 5, 2018
発行日:2019年3月15日Published: March 15, 2019

2004年~2007年における青森県太平洋沿岸の129I濃度の分布を観測し,水塊毎の129I平均濃度やその起源について検討した。水塊毎の129I濃度の平均値は(14~19)×106 atoms/Lであり,水塊間でわずかに異なっていた。各水塊の129I濃度は,129Iのグローバルフォールアウトレベルや宇宙線などによる生成量を考慮すると,欧州の再処理工場からの大気放出の影響が大きいと考えられ,それぞれの水塊が形成される海域の偏西風や気団の影響の違いを反映していると考えられる。

We observed the distribution of 129I concentration off the Pacific coast in Aomori Prefecture from 2004 to 2007 and discussed the mean concentration of 129I in each water mass and origin of 129I concentration. The mean concentration of 129I in each water mass ranged from 14×106 to 19×106 atoms/L, which showed different between water masses. Considering global fallout level of 129I and amount of 129I produced by cosmic rays, 129I concentration in each water mass off the Pacific coast in Aomori Prefecture might be effected by the atmospheric release from European nuclear fuel reprocessing plants. The 129I concentration in each water mass seemed to reflect the differences in impact of westerly winds and air masses at the area that each water mass are formed.

Key words: iodine-129; water mass; the tsugaru warm current water system; the oyashio water system; the kuroshio water system

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