Cs 137 sediment dating

The reduction of water storage capacity in the lakes of the Yangtze basin was an important factor for the disastrous 1998 flooding.This study attempted to quantify sedimentation and its role in the water storage reduction in the middle and lower reaches of the Yangtze basin using the radionuclide of caesium-137 (Pb) as tracers.A methodology for determining the age of recent sediments in streams draining the region has been established based on combined geomorphic, stratigraphic, and radiometric dating techniques.Because clayrich sediments retain possible radionuclides and heavy metals derived from mineralization and mined sources, sample sites which contain fine-grained deposits that both predate and postdate mine-mill activity were located in abandoned-channel segments (oxbows) of major streams draining the eastern Grants uranium region.

Our client base is international and includes environmental consulting companies, universities, government research institutes and communities.The CRS model and/or the slope regression model will be applied. cumulative dry weight (g/cm) is supplied with the model results and interpretation.Several Radium-226(Ra-226) measurements are often required, usually 2 - 3 per Pb-210 core, to positively determine the Pb-210 background level throughout the core length.They are divided into three periods: two with slow deposition (1963–19–1998), and one with rapid deposition (1986–1994).This technique exploits the injection of radioisotopes into the atmosphere, which occurred during atmospheric nuclear testing, mainly in the late 1950s and mid 1960s.

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