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The long-term environmental mobility of anthropogenic 129I (physical half-life: 1.57 × 107 y) is of increasing concern from the view point of a low-level radiation risk assessment. A large amount of 129I and 137Cs (physical half-life: 30.1 y) were introduced into the environment from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) disaster. The apparent downward migration rates of the FDNPP-129...
Fifty-three samples, including brines associated with oil and natural gas reservoirs and groundwater samples from deep boreholes, were collected from the Pacific and Japan Sea coastal regions in Japan. The 129 I/ 127 I and 36 Cl/Cl ratios, and stable isotopes (δD and δ 18 O) are compared to investigate differences related to the geotectonic settings of the two regions...
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