Abstract: Process for the production of a device for the optical analysis of a microparticle flux and application to the production of a cytofluorimeter.As microparticles are able to emit light, around a nozzle (4) made from a material transparent to said light and whose hole (8) is provided for the passage of the flux, is moulded an optical element (6) made from a material transparent to said light, which has a melting point below that of the material of the nozzle and which has an optical index close to that of said material, and which has a dioptric element (10) admitting an optical axis passing through the hole. The cytofluorimeter in particular incorporates the device (2) obtained by this process.

Abstract: A gamma radiation detector, wherein it comprises a xenon crystal, a xenon atmosphere above said xenon crystal, a pair of electrodes comprising two metallic electrodes on either side of the xenon crystal, the first electrode being brought to negative potential (cathode) and located in the vicinity of one face of the xenon crystal and the second electrode brought to positive potential (anode) is placed parallel to the cathode in the xenon atmosphere and visualization device of the photons emitted in the gaseous xenon, whereby the face of the xenon crystal in the vicinity of the cathode is arranged in such a way that it receives the gamma radiation to be measured.