RadiationEnergy dispersion through matter or space. In atomic physics... detection and measuring device. It consists of a gas-filled tube which contains two electrodes held at a potential of > 1000 volts. An electric discharge takes place between the electrodes in the tube when it is penetrated by ionizing radiationAny radiation which directly or indirectly ionizes, e.g. alp.... The discharges are counted and signify a measure for the radiationEnergy dispersion through matter or space. In atomic physics... intensity.