All dates issued by ORAU have an OxA number. There are different series of numbers corresponding to different levels of service and QA. Samples which have recieved the full treatment are issued a unique OxA number [nnnn]. Others are identified by their wheel number [www] and the position in that wheel [pp]. In the case of measurements made with standards provided by other laboratories the wheel numbers are is a different series [xxx].

OxA-nnnn

Samples given this type of number are subject to the full QA treatment at all stages: These dates are ususally published in ORAU datelists in Archaeometry.

OxA-C-xxx-pp

Samples given this number are measured for outside laboratories. The standards and known age material is supplied by those laboratories and they perform all of the QA. ORAU only performs QA test on the:

OxA-V-www-pp

Samples given this number are made on material pretreated in other laboratories. Only the d13C is measured in order to correct for fractionation. The results issued directly by the AMS operators and are not subject to archaeological or stable istotope scrutiny. QA is performed on:

OxA-W-www-pp

Samples given this number are made on material pretreated and combusted in other laboratories. The results issued directly by the AMS operators and are not subject to archaeological or stable istotope scrutiny. QA is performed on:

OxA-X-www-pp

These samples are research measurments using non-standard or experimental methods.

QAP 15/03 Issue 1 29/09/99