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The age of the sediment from a particular depth in the sediment column can then be inferred.
If modelling and interpretation are requested, the Pb-210 results will normally be modelled to obtain the best fit of the data, where possible.
At Flett we use Lead-210(Pb-210) and Cesium-137(Cs-137) to determine the rate of sediment accumulation in lakes, oceans and other water bodies.
It is typical to analyze 10 - 20 sections of a sediment core for Pb-210 and a similar number of Cs-137, covering an accumulation period of about 160 years.
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In contrast, uranium is soluble to some extent in all natural waters, so any material that precipitates or is grown from such waters also contains trace uranium, typically at levels of between a few parts per billion and few parts per million by weight.
As time passes after the formation of such a material, uranium-234 in the sample, with a half-life of 245,000 years, decays to thorium-230.