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In the framework of a national funded program for nuclear safety, a firstprototype of portable gamma camera was built and tested. It integrates aCaliste-HD CdTe-hybrid detector designed for space X-ray astronomy coupled witha new system-on-chip based acquisition system (FPGA and ARM microprocessor) andthermo-electrical coolers for a use at room temperature. The complete gammapart of the camera fits in a volume of 15 x 15 x 40 cm^3 for a mass lower than1 kg and a power consumption lower than 10 W. Localization andspectro-identification of radionuclides in a contaminated scene weredemonstrated during several test campaigns. A new generation of system is underdevelopment taking into account feedback experience from in-situ measurementsand integrating a new generation of sensor cost-optimized by industrialapplications called Caliste-O. Caliste-O holds a 16 x 16 pixel detector of 14 x14 mm^2 and 2 mm thick with 8 full-custom front-end IDeF-X HD ASICs. Twoprototypes were fabricated and tested. The paper will present the results ofin-situ measurements with the first gamma camera, the spectroscopic performanceof Caliste-O and the design of the second generation of gamma camera which aimsfor real time imaging and spectro-identification.

Second generation of portable gamma camera based on Caliste CdTe hybrid technology