A tentative guide to the expression of uncertainties for the evaluation of critical experiments
G. Poullot, J. Anno, D. Doutriaux, ICSBEP 2000, 26-30/06/2000, St-Petersbourg (Russia).
Recent ICSBEP meetings have shown the concern of the working group for uncertainties in reevaluated experiments. When using a reevaluation reported in the ICSBEP Handbook, the reader can encounter problems of different types:
- he mixing of uncertainties on physical parameters either coming from a large number of measurements or given as tolerances,
- the lack of information about the level of confidence and degrees of freedom corresponding to reported uncertainties,
- inconsistencies in the reported level of confidence (corresponding to 1, 2 or 3 s) between the different uncertainties taken into account,
- when the uncertainty on a physical parameter is converted in reactivity equivalent uncertainty, the total experimental uncertainty is given without mentioning the level of confidence.