Radiocarbon dating bone collagen dating asian girls in vancouver
If macrofossils are not available, bulk peat samples can be analysed.
Please remove any roots from bulk samples before sending them.
1988 and using the ultrafilter cleaning method of Bronk Ramsey et al. A collagen yield of less than ~1% means that the sample was not well preserved and is unacceptable for dating purposes.
These samples will not proceed to the final AMS stages.
Marine Samples Marine samples have approximately a 400 year offset from contemporaneous terrestrial samples due to the Marine Reservoir Effect (MRE).
This can be corrected for in calibration using radiocarbon ages of modern (pre-nuclear testing) shells which have been measured for many regions of the ocean.
For soils and sediments the carbon content varies greatly.
If the % carbon is unknown then please contact us about conducting testing a sample first.
There is the possibility of re-worked macrofossils being deposited in the lake.We pre-screen bones for nitrogen content which allows us to predict whether a bone has sufficient collagen preservation about 85% of the time based on research by Oxford Radiocarbon Accelerator Unit.Bones with low nitrogen content will not be processed to collagen.Generally monospecific planktonic samples are selected for this purpose.Contaminants: Please indicate on the submission form if there are any known contaminants which could effect the radiocarbon age.