radiocarbon dating shells

Measuring Oxygen Isotope Ratios (δ18O) for Carbonates

Sample size recommended
Carbonates that are ready for measurement – 2 mg
For carbonates that are not ready for measurement and require pretreatment, please contact us.
Recommended container
Ziplock Bags (place in Aluminum foil if sample is small or can be crushed during shipment)
Please send your samples in small boxes instead of envelopes to protect the samples.
Turnaround time
7 business days for pretreated samples
14 business days for samples that require pretreatment in the lab
Beta Analytic offers oxygen isotope measurements for carbonates on a standalone basis, without radiocarbon dating.

Note – The laboratory also automatically includes d18O and d13C values alongside radiocarbon dating results for carbonate samples. The d18O and d13C measurements are performed simultaneously on the carbonates in an isotope ratio mass spectrometer (IRMS) at no additional cost to the client.

The interpretation of d18O values, as applied in paleotemperature studies and paleoclimate reconstructions, lies with the submitter.

Please note that the laboratory now also provides Oxygen-18 and Deuterium stable isotope measurements for water samples.

Pretreatment – It is important to understand the pretreatment applied to samples since they directly affect the final result. Contact us to discuss.

Submittal – Please use this data sheet when submitting samples for d18O analysis NOT in conjunction with C14 dating.

Please contact us at if you are in doubt about the suitability or weight of your sample.