Radioactive Monitoring on the RN Soyo Maru Expedition in the Sea of Japan and Its Applications to Research for Geochemical Cycles

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  • 日本海放射能調査および海洋研究への適用: 中央水産研究所「蒼鷹丸」調査航海を例にとって
  • ニホンカイ ホウシャノウ チョウサ オヨビ カイヨウ ケンキュウ エ ノ テキヨウ : チュウオウ スイサン ケンキュウジョ 「 ソウタカマル 」 チョウサ コウカイ オ レイ ニ トッテ

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As a result of atmospheric nuclear test explosions, the Chernobyl reactor accident, radioactive effluents from nuclear power plants, etc., and radioactive waste disposal, anthropogenic radionuclides (e.g.,Cs and iosmAg) have spread widely into the world's oceans, including the Sea of Japan.Therefore, around the Japanese Archipelago, radioactivity monitoring of anthropogenic radionuclides has been continually conducted since the 1950s using various marine samples. Particularly in the Sea of Japan, radioactive waste disposal by the former Soviet Union during the I 970s and I 980s became apparent in I 993. Therefore, to assess the effect of the disposal in the Sea of Japan, radioactive monitoring in deep sea environments has been conducted every year since I 996 on the R/V (Research Vessel) Soyo Maru expedition (National Research Institute of Fisheries Science), in addition to the previous conventional surface/coastal monitoring. In the present paper, we exhibit the sampling techniques for seawater (CTD-RMS), marine sediment (core samplers), biota (deep sea pods and benthos nets), and sinking particles (sediment traps) for deep-sea environmental monitoring. We also present the applications of the samples collected on the expeditions to research of geochemical cycles and of the assessment of low-level contamination caused by the Fukushima Dai-ichi Nuclear Power Plant accident (March 201 I) within the Sea of Japan.

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