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Radiocarbon dating by liquid scintillation counting of 14 CO 2 absorbed into an alkaline liquid was first developed for groundwater research. In the 1980s it was applied to molluscs, barnacles, corals and other carbonates, and yielded dependable results within a few hours, with standard errors of ∼10% for ages <14000yr, at about 1/200 the price of commercial 14 C dates....