Suerc radiocarbon dating laboratory
The bulk of the woody material was dated, and one of the largest fragments, AA-40741 (GU-9186A), was separately dated by AMS.
There is a difference between the two results but given the uncertainties associated with the sample, the magnitude of the difference is not too unreasonable.
Calibrated radiocarbon dates are presented using the 2-sigma values which account for 95.4% of the probability of the date falling within that particular range.
The repeated mentions of liquid nitrogen, for example, were intriguing as my prior knowledge of its properties was only from movies.Your access to the NCBI website at gov has been temporarily blocked due to a possible misuse/abuse situation involving your site.This is not an indication of a security issue such as a virus or attack.The gas lines (see photo) used for extracting various gases and cryogenically capturing the CO2 were visually impressive (and initially daunting when Callum suggested I attempt a sample myself).But he clearly explained the order in which each valve is turned in order to check for leaks, move gases through the liquid nitrogen and water traps, and measure the total CO2 captured so, in the end, it was great fun and I spent much of Tuesday doing this procedure.