Abstract: A scintillation camera, comprises the structure of a scintillation crystal (10), a collimator (20), a light guide (30), an array (50) of p photodetectors, p acquisition channels (60), and a processor (100) for supplying the coordinates x.sub.j and y.sub.j of a scintillation j and its associated energy E.sub.j, and further comprises structure characterized in that:(A) the p acquisition channels apply p digital signals to the input of the processor;(B) the processor (100) itself comprises:(a) a bus for transferring the p digital signals;(b) a digital summing stage (200);(c) a scintillation processing stage; and(C) a detection, sequencing and storage stage (400) which receives a signal which corresponds to the sum of the p output signals of the photodetectors, is provided in order to supply the various clock signals and the correction coefficients for the scintillation processing stage.

Abstract: An installation for chemical conversion of a gas mixture containing hydrogen and hydrocarbons comprises a series of reactors in which the gas mixture undergoes endothermic reactions at temperatures within the range of 350.degree. C. to 900.degree. C. A furnace is placed upstream of each reactor for reheating the gas mixture prior to introduction into the reactor. The furnaces are equipped with electric heating resistors which are intended to be placed in direct contact with the gas mixture as it is introduced into each furnace.

Abstract: The high-power electric heating device is capable of heating gas mixtures such as a mixture of hydrocarbons and hydrogen to temperatures and pressures attaining 900.degree. C. and 60 bar respectively. A central duct connects the gas mixture inlet to the outlet and is constituted by a plurality of superposed independently removable modules. Each module comprises a plurality of electric resistance elements formed by banks of adjacent metallic strips. A peripheral zone of the device contains power supply conductors connected to the modules. By means of passages in the form of slits between the central duct and the peripheral zone, a small fraction of the gas stream is permitted to flow within the peripheral zone.