Ricerc@Sapienza

Self-Powered Neutron Detectors (SPNDs) are currently used in reactors’ environmentto sense the magnitude of neutron-?uxes, usually for spatial-distribution mapping ofthe fuel region as to optimize burn-up strategies. During the development of tailoredinstrumentation for Lead-cooled Fast Reactors, the possibility to perform online spec-tral deconvolution of fast neutron-?uxes was recognized. Seven geometrically simi-lar SPNDs with di?erent neutron-sensitive materials, have been characterized by theMonte Carlo transport code MCNPX. ?anks to a database of spectral sensitivitiesvs. neutrons’ energy, a mathematical deconvolution process from 7 electric currentvalues virtually measured by SPNDs was started, retrieving spectral information, interms of 7 energy windows, of the neutron-?ux the detectors are subjected by. ?ispaper describes the procedure that led to those results, pre?guring future develop-ment to improve proposed method.