Isotope-Ratio and Background Corrections for Accelerator Mass Spectrometry Radiocarbon Measurements

We present here the method we use to convert to radiocarbon ages ( 14 C/ 13 C) ratios measured in the Arizona Accelerator Mass Spectrometer facility. We describe the procedures we use to convert sample and standard isotope ratios to values appropriate for calculation of radiocarbon ages. We also discuss, in some detail, corrections to account for sample contamination.