CHARACTERIZATION OF A SAMPLE BY DECOMPOSITION BASED ON MATERIALS.

摘要

A method for characterizing a sample, by estimating a plurality of characteristic thicknesses, each being associated with a calibration material, including acquiring an energy spectrum (Sech) transmitted through this sample, located in an X and/or gamma spectral band, naled spectrum transmitted through the sample; for each spectrum of a plurality of calibration spectra (Sbase(Lk; Ll)), calculating a likelihood from said calibration spectrum (Sbase(Lk; Ll)), and from the spectrum transmitted through the sample (Sech), each calibration spectrum (Sbase(Lk; Ll)) corresponding to the energy spectrum transmitted through a stack of gauge blocks, each formed of a known thickness of a calibration material; estimating the characteristic thicknesses (L1, L2) associated with the sample according to the criterion of maximum likelihood.