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Since that time, CALIB, now renamed Int Cal, has been refined several times--as of this writing (January 2017), the program is now called Int Cal13.Int Cal combines and reinforces data from tree-rings, ice-cores, tephra, corals, and speleothems to come up with a significantly improved calibration set for c14 dates between 12,000 and 50,000 years ago.What you need is a ruler, a reliable map to the reservoir: in other words, an organic set of objects that you can securely pin a date on, measure its C14 content and thus establish the baseline reservoir in a given year.Fortunately, we do have an organic object that tracks carbon in the atmosphere on a yearly basis: tree rings.

As you might imagine, scientists have been attempting to discover other organic objects that can be dated securely steadily since Libby's discovery.Radiocarbon dating is one of the best known archaeological dating techniques available to scientists, and the many people in the general public have at least heard of it.But there are many misconceptions about how radiocarbon works and how reliable a technique it is.Beginning in the 1990s, a coalition of researchers led by Paula J.Reimer of the CHRONO Centre for Climate, the Environment and Chronology, at Queen's University Belfast, began building an extensive dataset and calibration tool that they first called CALIB.




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