Horizontal Distribution Profiles of 238U, 137Cs and Stable Elements in the Bottom Sediments of the Brackish Lake Obuchi in Aomori Prefecture.

概要

論文の詳細を見る
The horizontal distribution of radionuclides such as 238U, 117Cs and 40K, and stable elements in the bottom sediments of the brackish Lake Obuchi was surveyed in 1995. Samples were collected at a network of thirty stations in the lake. The following results were obtained from the analysis of the relationships between the concentrations of radionuclides or stable elements in the bottom sediments and the shape of the water basin, water currents, grain size of bottom sediments, the content of organic matter in the bottom sediments and so on. 1) The concentration of their elements in the bottom sediments were classified into two characteristic distributions. On the one hand, 238U, 137Cs, 40K and Mn concentrations were high in the area (>3 m, water depth) from east to west part of Lake Obuchi. On the other hand, Al, Co and Ba concentrations were high at the influx vicinity of the Futamata River which is located on the west side of the lake. 2) The correlation coefficient between salinity and 238U or 137Cs in the water of Lake Obuchi showed high values at 0.95 and 0.89, respectively. These results suggest that the source of 238U and 137Cs in the bottom sediments are mainly sea water.
日本陸水学会の論文