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A new kind of sensor under development in order to detect high energy X or gamma rays is presented. It is based on a inorganic scintillator optically coupled to a ribbon of fluorescent optical fibers.The basic configuration is first shortly described. Investigations on the principal properties of the fluorescent fibers used for the detector are then reported : the fiber attenuation, the influence of long term bending, the emission and excitation spectra, the radiation resistance tested by mean of a 60Co source and a 18MV linear accelerator, etc. .A detailed characterization of these fibers has been realized and complete experimental results are presented.

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