Radiation monitor for ionizing radiation with acoustic indication of the pulse rate by means of a sequence of acoustic pulses

The acoustical indication of the instrument containing a Geiger-Mueller counter tube can be detected and identified by the human ear as a sequence of separate pulses of specified pitch in the total range of intensities of the ionizing radiation to be monitored. The number of bistable stages of the associated circuit is selected in a corresponding manner. In addition the pulse-forming stage has got a differentiating element by which the pulse duration of the square-wave pulse is bounded on the upper side. Finally an audio-frequency generator connected at the outlet side of the differentiating element produces acoustic signals of corresponding length fed to a loud-speaker. (DG)