Abstract: Process for the production of a sensitive plate for an exoelectron dosimeter by producing on a support a deposit of a mixture of two compositions constituted on the one hand by a substance having traps for the electrons and able to emit exoelectrons by thermal or optical stimulation and on the other by a substance having a good ionic conductivity, wherein it comprises making a homogeneous mixture of the powders constituting the two said compositions, producing by means of a plasma arc torch a plasma jet in the vicinity of the support on which the deposit is to be made and spraying said powder mixture into the jet to obtain a deposit which adheres to the support.The exoelectron dosimeter comprises a support to which adheres a plate constituted by two substances, one of which has traps for the electrons and is able to emit exoelectrons by thermal or optical stimulation and the other has a good ionic conductivity.

Abstract: A metal coating is deposited on a metal substrate by means of a method which consists in sand-blasting the metal substrate, in heating the substrate to a temperature between 100.degree. and 650.degree. C, then in spraying a powder of nickel or cobalt alloy having a high value of hardness and containing reducing agents as well as agents for reducing the melting point, the spraying operation being performed at a distance of 50 to 200 mm from the nozzle of a spray-gun and at a velocity within the range of 100 to 250 meters per second.