Reservoir effect radiocarbon dating
The global marine reservoir correction is automatically applied via the Marine Int Cal13 calibration program based on the age of the sample. These values take into account that it takes 200-500 years for present-day carbon dioxide in the atmosphere to be incorporated and distributed (equilibrated) through the ocean water column.
Delta±R can additionally be applied to samples of marine shell fish based on certain geographic areas of the globe.
The half-life is the time taken for an amount of a radioactive isotope to decay to half its original value.
A Delta±R correction is applied to a radiocarbon date that has already been corrected with the global marine reservoir correction.
Please note that the lab also needs the Delta RErr value, without this number the Delta-R value is invalid.
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However, this approach assumes a constant hard water effect over the entire period under consideration, which generally is unlikely.
Here we present a highly variable hard water effect through time determined from a combined chronology of two long sediment cores from Lake Heihai (NE Tibetan Plateau).