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Posted by / 06-Oct-2017 22:27

Calibrated age dating

The half-life is the time taken for an amount of a radioactive isotope to decay to half its original value.

Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive.Despite being obtained from different surfaces (moraines, glaciofluvial deposits and bedrock) and varied metamorphic lithologies, the -value overall means and 95% confidence intervals for the ‘Little Ice Age’, Preboreal and Younger Dryas age categories (respectively, 60.0±1.6, 41.6±1.4 and 34.2±2.0) are statistically significantly different.Only two outlying sites in the two younger age categories have overlapping confidence intervals, demonstrating remarkable robustness in differentiating early- and late-Holocene surfaces.Various geologic, atmospheric and solar processes can influence atmospheric carbon-14 levels.Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.

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