Distribution of <sup>129</sup>I, <sup>134</sup>Cs, and <sup>137</sup>Cs in the Eastern Area off Cape Shiriya, Aomori Prefecture

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  • 青森県尻屋埼東方海域における<sup>129</sup>I及び<sup>134</sup>Cs, <sup>137</sup>Csの分布
  • 青森県尻屋埼東方海域における¹²⁹I及び¹³⁴Cs,¹³⁷Csの分布
  • アオモリケンジリヤサイトウホウ カイイキ ニ オケル ¹ ² ⁹ I オヨビ ¹ ³ ⁴ Cs,¹ ³ ⁷ Cs ノ ブンプ

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This study investigated the interaction with water masses from the distribution of Iodine-129, Cesium-134, and Cesium-137 in the eastern area off Cape Shiriya, Aomori prefecture. Iodine-129, Cesium-134, and Cesium-137 concentrations in water samples collected in July 2012 were 13.7-30.2 nBq/L, N.D.-5.45 mBq/L, and 0.79-9.44 mBq/L, respectively. Concentrations of these radionuclides at the 25.5-26.7 isopycnal (σt) increased above the environmental levels before the Fukushima Daiichi nuclear accident, and their increase depended on a formation process of water masses. It is considered that concentrations at the 25.9-26.0 σt were increased by mixing the Tsugaru Warm Current Water System with near-surface water in the Oyashio region, but concentrations at the 26.4 σt were increased by mixing the Tsugaru Warm Current Water System with the Kuroshio-Oyashio mixed water.

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