Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1445b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 6, pp.1445-1456
Physics
3
Scientific paper
The mass balances of 210 Po and 210 Pb were determined for Bickford Pond, Massachusetts. Activities of these nuclides at various depths within the water column, in sediments, in streams flowing into and out of the lake and in precipitation were measured at approximately monthly intervals for a period of one year. Streamwater contained about 10 dpm/100 kg of 210 Pb, mostly filtrable and showed little variation with changing flow. 210 Pb in the streams is believed to be derived mostly from 222 Rn that enters groundwater via alpha-recoil from aquifer matrix materials. It is therefore not meteoric in origin and represents a local source to the lake. Surface inflow was equally important as precipitation as a source of 210 Pb to the lake. Only half of total 210 Pb input was trapped in sediments; the rest was lost from the lake as outflow. The 210 Pb removal times via scavenging and sedimentation both averaged close to 40 days and 210 Pb scavenging was almost an order of magnitude greater than that of 210 Po.
Benoit Gaboury
Hemond Harold F.
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