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ABSTRACT: Objectives: The diet and subsistence in Iron-Age ?land is debated as earlier studies and different archaeological sources seemingly provide conflicting interpretations.In this paper, we explain our routine pretreatment of bone for radiocarbon dating by accelerator mass spectrometry (AMS), based on the specific reaction between amino acids and ninhydrin described by Nelson (1991).The values and uncertainties of the total system background are presented as a function of the carbon sample mass and the reliability of this method is discussed.Desmond Clark (1979) wrote that were it not for radiocarbon dating, "we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation" (Clark, 1979:7).

The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.The objectives of this study are therefore to: (i) add new insights on diet and (ii) investigate the chronological variation in detail.It is common in studies of diet to investigate differences between datasets defined by archaeological periods (determined by artefact typology), but it is rare to explore whether these dietary changes are, in fact, well correlated with these temporal categories or not.Renfrew (1973) called it 'the radiocarbon revolution' in describing its impact upon the human sciences.Oakley (1979) suggested its development meant an almost complete re-writing of the evolution and cultural emergence of the human species.This method of prescreening is now regularly used at the Oxford Radiocarbon Accelerator Unit (ORAU).