What is radioactive carbon dating used for dating single site za
In such a case, it is very difficult to ascertain the precise reservoir difference and hence apply a correction to the measured radiocarbon age.
Spurious radiocarbon dates caused by volcanic emanations of radiocarbon-depleted CO2 probably also come under the category of reservoir corrections.
A shellfish alive today in a lake within a limestone catchment, for instance, will yield a radiocarbon date which is excessively old.
The reason for this anomaly is that the limestone, which is weathered and dissolved into bicarbonate, has no radioactive carbon.
Since that time the amount has declined owing to exchange and dispersal of C14 into the Earth's carbon cycle system.The effect has been suggested as providing dates in error for the eruption of Thera which has been linked to the demise of the Minoan civilisation in the Aegean.One modern plant growing near the emanations had an apparent age of 1390 yr.The effect of this has been to almost double the amount of C14 activity in terrestrial carbon bearing materials (Taylor, 1987).De Vries (1958) was the first person to identify this 'Atom Bomb' effect.