GEOG 4440 Lecture Notes - Becquerel, Surface Runoff, Silt

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7 Oct 2012
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Ph and conductivity are very constant for both. Radon concentrations detected in lake fairly low, but still detectable. Concentrations in march were ~50% higher than the mean value for july (0. 85. However, during july campaign radon degassing did occur. Sediment of lake a found to be distributed homogenously over 5 sample points. Nature of sediment material did not allow experimental determination of diffusive radon flux term fdiff. Lowest value of the four radon concentrations detected during july campaign (3-a, table: was considered to be representative of diffusive radon inputs from sediment into lake. I. e. sum of the radon sink terms ( rnirn+fatm) valid for sampling point 3-a was assumed to be balanced by fdiff only. Fadv + fdiff + rnira= rnirn+fatm, found that diffusive radon flux at point 3-a estimated to be 0. 17 0. 10 bq/m2/d. For calculation of radon inventory of lake water an average depth of 1 m was used.

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