The steps you take to prepare your sample for AMS analysis are by far the most important determinant of the quality of the radiocarbon result. Your choices define the sample and determine the scope of questions that can ultimately be addressed. While AMS allows the precise measurement of radiocarbon from tiny amounts of material, the potential resolution can easily be obscured by analyzing inappropriate components.
Note about δ13C analysis:
Aerosols, Black Carbon, Bone Collagen, Charcoal, Compound-specific, Dissolved Organic Carbon, Plant/wood, Petroglyph/rock paint, Sediment (total organic), Aerosols (total organic)
Sediment (carbonates), Mollusc, Dissolved Inorganic Carbon, Foraminifera, Coral, Mortar
CO2 Gas, Graphite, Contamination check/swipes