Device to display disintegrations of positrons using barycentric and time of flight measurements

Claim 1

Device to display positron disintegrations, each disintegration being a source of simultaneous emissions of gamma radiations, said device comprising: at least one pair of scintillators sensitive to gamma radiations and disposed opposite each other, each scintillator having a plurality of faces, sets of photoelectron multipliers each associated with one scintillator, for each scintillator, an electronic barycentric measuring device connected to the associated photoelectron multiplier set for measuring the position of the scintillations appearing in the scintillator in question, for each pair of scintillators, electronic means connected to the associated sets of photoelectron multipliers for determining the times of flight of gamma radiations coincidence--detected in each of the scintillators of the pair in question, an electronic device for localizing the disintegrations of positrons, said localizing device being connected to the electronic barycentric measuring devices and to the means for determining the times of flight and providing a three-dimensional location for the disintegrations, two dimensions being established by the electronic barycentric measuring devices and the third by the means for determining times for flight, a display system connected to the localization device for displaying a visual indication in response to said three-dimensional locations.