Abstract: A method of real-time mapping of a presence distribution of a source of photons in a site. The method includes measuring, at a plurality of measurement points, a photon flux in an energy bandwidth determined with a spectrometric detector, and noting the geographical co-ordinates of the point. At each measurement point, from a response function of the detector, and information on the site, establishing a distribution of origins of the photons around the measurement point. From the distributions, representing, on a map of the site, a distribution of origin of photons, the method further includes, for each measurement point starting from the second, a step prior to the representing step, during which the distributions of origins of the photons around the current measurement point are correlated with those of previous measurement points.

Abstract: The invention relates to a method for a study of a photon emission source at a site, the method including the steps consisting of: measuring (100) the spectrometric data and the geographic coordinates of the measurement point at a surface point of said site and storing said data in association with said coordinates in a memory; moving (200) the detector to at least one other point of the site and, at each point, repeating the step of measuring and storing; and implementing a deconvolution step (500), using a predetermined detector response function, on all the measured spectrometric surface data, in order to obtain refined spectrometric surface information, said spectrometric surface information enabling the geographic location and the evaluation of the photon emission rate of said source. The invention further relates to a system suitable for implementing the method.

Abstract: The invention concerns a method of real-time mapping of a presence distribution of a source of photons in a site, the method comprising the steps consisting of measuring (100), at a plurality of measurement points, a photon flux in an energy band-width determined with a spectrometric detector, and noting the geographical co-ordinates of said point, and, at each measurement point, —from a response function of the detector, and information on the site, establishing a distribution of origins (200) of the photons around the measurement point, —from the distributions, representing (300), on a map of the site, a distribution of origin of photons, the method further comprising, for each measurement point starting from the second, a step (250) prior to the representing step (300), during which the distributions of origins of the photons around the current measurement point are correlated with those of previous measurement points.