Human reliability analysis variations

Major sources of uncertainty in human reliability analysis include the availability of actuarial data on human error probabilities and the variability of human performance. Human factors specialists call for the institution of data banks concerning human error that would be used in the same way as equipment data banks. For HEP one would like to know the number of errors for each action that occurred and how many times these actions were performed. For the present, the state of behavioral data remains insufficient. Most of the estimates of hep s represent extrapolations from human error data based on tasks performed in a variety of settings, e.g. within process industries and in industrial and military settings. Due to variations in equipment, tasks, and environment, errors are hardly comparable. 

In order to reconstruct human diet from bone tissue, direct isotopic analysis of animal and plant remains from the same archaeological context is the most reliable way to detect isotopic shifts involving the whole ecosystem due to environmental variation. Since this is often impossible for the lack of these control samples, we have explored the use of 8I80 to assess the environmentally induced variation in 8I3C and 8ISN values from collagen and apatite, and assess the dietary information they represent. This can be done assuming a scarce nutritional role of marine resources and the absence of C4 crops, as seems to be the case in the western Mediterranean and specifically in the Sardinian Neolithic and Bronze Age. 

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