Carbon dating biogenic sediments
Please contact us to discuss the nature of your research objective to ensure the most appropriate pretreatment of your sediment sample.You are welcome to contact us to discuss the pretreatment or request that we contact you after the pretreatment to discuss options for radiocarbon dating. However, knowing the dry weight will better allow you to estimate the amount of material to send.The INTCAL98 calibration curve thus constructed has been accepted by international consent (see Stuiver et al., 1998).Two other U-Th dates provide a tentative extension to the INTCAL98 curve which has been used in this report to provide a calibration curve back to about 40k years BP.Our reports contain official radiocarbon dating certificates for each sample together with calibration curves showing how each conventional radiocarbon age for samples has been calibrated with the calendar year curve.Suitable for dating sediments up to c.45Ka old as long as they contain suitable biogenic material (molluscs, microfossils, wood).Suitable specimens are selected by picking through the residue.
Extension of the calibration curve further back to about 24,000 calendar years BP has been achieved using U-Th decay series dates from marine organisms (principally corals).
If you want to dry your samples, heating at 90°C to 100°C for 4-24 hours is recommended.
Sending wet or frozen samples for radiocarbon dating is fine.
Using the INTCAL98 curve it is possible to convert radiocarbon years to calendar years by projecting the radiocarbon age onto the curve and observing the intercept on the calendar year axis.
This can be done manually, but there are now computer programs in the public domain which will provide a more consistent and accurate calibration.
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