METHOD FOR ESTABLISHING A SPECTRAL RESPONSE FUNCTION OF A SYSTEM FOR MEASURING BY X OR GAMMA RAY

A method for determining a response of a spectrometric system for measuring ionizing x-ray or gamma-ray photons, the measuring system comprising:a radiation source, configured to emit ionizing radiation along an emission axis;a pixelated detector, which comprises pixels, each pixel being configured to detect radiation emitted by the radiation source, and to acquire thereof an energy spectrum, in a plurality of energy channels;the emission axis being an axis extending between the radiation source and the detector;the response of the measuring system taking the form of effective spectra, defined for each pixel, and in each energy band, the effective spectrum of a pixel, in an energy band, corresponding to an energy distribution of the photons detected, by the pixel, in the energy channel, in the absence of any object interposed between the source and the pixel.