CHARACTERIZATION OF A SAMPLE BY DECOMPOSITION BASED ON MATERIALS.

摘要

The invention relates to a method for characterizing a sample, by estimating a plurality of characteristic thicknesses, each associated with a calibration material, comprising the following steps: - acquisition of a spectrum of energy transmitted through this sample (Sech), located in an X and / or gamma spectral band, said transmitted spectrum of the sample; for each of a plurality of calibration spectra (Sbase (Lk; L1)), calculating a likelihood from said calibration spectrum (Sbase (Lk; L1)) and the transmitted spectrum of the sample (Sech) each calibration spectrum (Sbase (Lk; L1)) corresponding to the energy spectrum transmitted through a stack of shims each formed of a known thickness of calibration material; estimating the characteristic thicknesses (L1, L2) associated with the sample according to the maximum likelihood criterion.