Novel Nuclear Measurements Technologies for Safety and Security

Abstract

A series of novel nuclear measurements technologies such as hybrid gamma spectroscopy and real time 3D-contamination modelling have been developed recently at AREVA towards Safety and Security applications as result of direct experiences and related to Fukushima site remediation project.

The novel hybrid spectroscopic systems, combining spectra from different type of detectors (NaI, HpGe, CdZnTe, CsI(Tl)..) (High and low-resolution detectors) are evaluated for security screening applications. Repeated measurements with a variety of sources and acquisition times are analysed, with the results showing that hybridization can enhance peak detectability relative to the individual constituent detectors, improve detection probability and reduce the false alarm rate. Fukushima accident imposed a stretch to nuclear measurement operational approach requiring in such emergency situation: fast deployment and intervention, quick analysis and fast scenario definition. AREVA, as return of experience from his activities carried out at Fukushima has developed a novel multi-sensor solution as part of his D&D research, approach and method, a system with real-time 3D photorealistic spatial radiation distribution cartography of contaminated premises. The system may be handheld, mounted on a mobile device (robot, drone, e.g.). In this paper, some details of the current development based on a SLAM technology (Simultaneous Localization And Mapping) and integrated sensors and detectors allowing simultaneous topographic and radiological data are showed. System allows dose rate and gamma spectrum distribution in a 3D activity mapping.