Geochemical cycles in the Japan Sea from spatial distributions of multi-radionuclides

在本研究中，我们应用低本底伽马能谱对日本海、东中国海和鄂霍次克海的^&lt；226&gt；Ra，^&lt；228&gt；Ra，^&lt；137&gt；Cs，^&lt；134&gt；Cs和^&lt；228&gt；Th的时空变化进行了研究。我们可以阐明这些区域的水团和颗粒的流动模式(如垂直水循环和地表水团的横向混合)。我们还澄清了福岛第一核电站事故后放射性铯的污染水平和输送模式

In this study, we applied low-background gamma-spectrometry to conduct a investigations of spatial and temporal variations of^<226> Ra,^<228> Ra,^<137> Cs,^<134> Cs, and^<228> Th activities in the Japan Sea, the East China Sea, and the southwestern Okhotsk Sea. We could elucidate the flow patterns of water masses and particles in these areas(e. g., vertical water circulation and lateral mixing of surface water masses). We also clarified contamination levels and delivery pattern of radiocesium after the Fukushima Dai-ichi Nuclear Power Plant accident