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

Daniel Maier (1) , Claire Blondel (1) , Cyrille Delisle (1) , Olivier Limousin (1) , Jérôme Martignac (1) , Aline Meuris (1) , François Visticot (1) , Geoffrey Daniel (1, 2) , Pierre-Anne Bausson (3) , Olivier Gevin (3) , Guillaume Amoyal (4) , Frédérick Carrel (4) , Vincent Schoepff (4) , Charly Mahé (5) , Fabrice Soufflet (6) , Marie-Cécile Vassal (6)

1 DAP - Département d'Astrophysique (ex SAP)
2 ENPC - École des Ponts ParisTech
3 DEDIP - Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI)
4 LCAE - Laboratoire Capteurs et Architectures Electroniques
5 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
6 3D Plus

In the framework of a national funded program for nuclear safety, a first prototype of portable gamma camera was built and tested. It integrates a Caliste-HD CdTe-hybrid detector designed for space X-ray astronomy coupled with a new system-on-chip based acquisition system (FPGA and ARM microprocessor) and thermo-electrical coolers for a use at room temperature. The complete gamma part of the camera fits in a volume of for a mass lower than 1 kg and a power consumption lower than 10 W. Localization and spectro-identification of radionuclides in a contaminated scene were demonstrated during several test campaigns. A new generation of system is under development taking into account feedback experience from in-situ measurements and integrating a new generation of sensor cost-optimized by industrial applications called Caliste-O. Caliste-O holds a 16x16 pixel detector of 14x14 mm2 and 2 mm thick with 8 full-custom front-end IDeF-X HD ASICs. Two prototypes were fabricated and tested. The paper will present the results of in-situ measurements with the first gamma camera, the spectroscopic performance of Caliste-O and the design of the second generation of gamma camera which aims for real time imaging and spectro-identification.

Keywords: Gamma imaging; Gamma camera; CdTe; CALISTE-O; Compton camera; ORIGAMIX; CALISTE-HD; instrumentation; nuclear instrumentation; ionizing radiation; radioactivity; sensor; spectrometry; gamma camera

Domains: Instrumentation and Detectors [physics.ins-det]; Nuclear Experiment [nucl-ex]; Signal and Image processing

Daniel Maier, Claire Blondel, Cyrille Delisle, Olivier Limousin, Jérôme Martignac, et al.. Second generation of portable gamma camera based on Caliste CdTe hybrid technology. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018, 912, pp.338-342. ⟨10.1016/j.nima.2017.12.027⟩. ⟨cea-01765076⟩