Application of210Pb in soils |
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| Authors: | Helmut Dörr |
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| Institution: | (1) Trischler und Partner GmbH, Berliner Allee 6, 64295 Darmstadt, Germany |
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| Abstract: | The  spectroscopic measurement of soil samples is described.210Pb data from a soil survey in western-Europe are briefly reviewed. The average210Pb flux from the atmosphere, as determined from210Pb
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soil inventories, is 90 Bq m–2a–1. A simple one-dimensional box-chain model is described. The model simulates the vertical, post depositional transport of natural and fall-out radionuclides in the soil. Simulation of measured210Pb
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,134Cs,137Cs, and241Am soil profiles shows that mixing (bioturbation) is a very efficient transport mechanism. Lead seems to be strongly fixed to organic and clay particles. It is transported by the displacement of the organic and clay carrier substances. The mean residence time of lead, caesium, plutonium and americium in organic rich forest soils is in the order of 250–1000 years. An applicability study in investigate the use of210Pb in erosion problems showed erosion rates from 60–180 g m–2a–1 on organic rich forest and meadow sites with 10°–25° slopes.This is the eighth of a series of papers to be published by this journal following the 20
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anniversary of the first application of210Pb dating of lake sediments. Dr P. G. Appleby is guest editing this series. |
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| Keywords: | 210Pb 137Cs soil model-simulation migration mixing |
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