No abstract

Since several years, with the evolution of ESR spectrometers, the measurement of low absorbed doses seems to be accessible by alanine dosimetry. Some laboratories have realized important progress in this domain, but the influence of external physical and chemical factors that modify the results (fading) is not well quantified for using them with a sufficient accuracy for national or international comparisons, typically less than 3%. The first experimental study of combined effects has been realized in our laboratory. A necessary multiparametric approach (experimental design) has shown the complexity of the problem to solve before creating a physico-chemical model of the observed phenomena. The chosen methodology permits us to give the first quantitative approach of the fading for applied metrology.