Abstract: Material for scintillators, application to the construction of very fast, high energy photon detectors and to the construction of tomographs.The material for scintillators is constituted by barium fluoride which, under excitation, is subject to light emission having a slow component with a maximum centered on 3200 .ANG. and a fast component with a maximum centered on 2250 .ANG., the barium fluoride being purified so as to reduce the defects of its crystal lattice, in order to reinforce the intensity of the fast component of its light emission.

Abstract: The present invention relates to a portable computing device comprising, in known manner, means for adding digital information, means for determining periods of time and display means, wherein it also comprises a nuclear detector adapted to deliver electrical signals whose amplitude spectrum depends biunivocally on the energy spectrum of the radiation in which it is placed and means for converting these signals into digital information, the addition means receiving said digital information, the means for determining periods of time controlling said addition means so as to make a calculation of the dose of nuclear radiation received during a period of time, called integral dose, which is displayed by said display means. The invention is more particularly applicable in the domain of protection against radiation, or health physics.

Abstract: The present invention relates to a portable radiation measuring device, comprising a detector adapted to deliver electrical signals whose amplitude spectrum depends biunivocally on the energy spectrum of a radiation which may be received by the detector, amplification means and electronic means for compensating the sensitivity of the detector as a function of the energy so as to render it identical to that of human tissues, producing an output signal which is in a constant ratio with the energy of said radiation which may be absorbed by human tissues and display means, connected to the amplification and compensation means, for displaying the dose of radiation received by the detector.

Abstract: Radiation detector comprising an ionization chamber having at least two juxtaposed electrodes, formed by plates respectively raised to a first potential and to a second potential, said plates being supported at at least one of their upper and lower ends by upper and lower insulating strips, wherein the plates form in the vicinity of the insulating strips baffles which protect the strips against radiation.

Abstract: Conductive terminals located within a casing constituted by two separable portions and conductive terminals located outside the casing are interconnected by means of conductors which pass through the casing between the two separable portions. In particular, the invention permits interconnection of detection cells and measuring channels within an X-ray tomographic apparatus while preventing leakage currents, the connecting conductors being insulated with respect to each other and with respect to the casing.