Dating sediment cores

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In all but the top few cm of most sediment cores the sediment is old enough to ensure that the concentration of Pb-210 will be equivalent to that of the shorter-lived daughter isotopes.

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Applications are in the areas of Late Quaternary geochronology, sedimentology and biochronology.

About 5 g of dried sample, from various depths of the sediment core, is required.

The samples are processed to prepare Pb activities.

Sediment accumulation is the stage pertaining to a decidedly longer period: it is the result of particle deposition and removal, leading to the preservation of the strata.

Particle removal may be due to several mechanisms, e.g.

The system consists of a surface barrier detector, preamplifier, amplifier, mixer router, analog to digital converter, multi-channel analyzer, and appropriate computer software.

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