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Leibniz labor for radiometric dating and isotope research

Chemical removal of conservation substances by 'soxhlet'-type extraction.

abstract Nadeau M-J, Grootes PM, Voelker A, Bruhn F, Oriwall A, 2001.

Over the past decade we have witnessed a remarkable development and proliferation of accelerator mass spectrometers; these instruments have reduced the counting time by a factor of 100 and reduced the sample size by a factor of 1000 compared to the classic B-counting systems.In a series of published papers and manuscripts soon to be published, we present our analytical techniques in detail (Mortlock et al., 2005; Chiu et al., 2005a) and the geochemical (Cao et al., 2005) and geophysical (Chiu et al., 2005b, 2005c) explanations for the departure of radiocarbon dates from the true calendar ages and compare our results to other radiocarbon calibration data.View the entire radiocarbon calibration curve here.It is estimated that nearly 90% of all measurements made at the more than 50 active accelerator mass spectrometry laboratories are radiocarbon dates.This dramatic increase in the number of radiocarbon dates is driving the demand for a radiocarbon calibration program that spans the entire radiocarbon timescale from the present to 55,000 years BP.C-AMS at the Leibniz-Labor: Radiometric dating and isotope research.Nuclear Instruments and Methods in Physics Research Section B 223-224, 55-61.Extension of the C record beyond the 0 to 11,900 year long tree ring record is well underway, being measured in many different archives, and undoubtedly an enormous amount of scientific knowledge will stem from these studies.In our laboratory, we have overlapped and extended the tree-ring radiocarbon calibration from 3,000 to 55,000 yrs.The conventional (beta-decay counting) Radiocarbon Laboratory was closed in 2004 when its head, Dr.Besides its radiocarbon dating service the Leibniz-Laboratory is actively involved in research projects applying AMS C dates beyond the calibration dataset.

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