Automatic scintillation counter

Claim 1

A SCINTILLATION COUNTER FOR MEASURING INCOMING RADIATION, COMPRISING A SUBSTANCE ADAPTED TO INTERACT WITH SAID RADIATION AND TO PRODUCE LIGHT AS A RESULT OF SAID INTERACTION, A PHOTOELETRIC SYSTEM FOR TRANSLATING SAID LIGHT INTO USEFUL ELECTRICAL IMPULSES OF RELATIVELY LARGE MAGNITUDE, SAID USEFUL IMPULSES BEING ACCOMPANIED BY PARASITIC IMPULSES OF SMALLER MAGNITUDE ORIGINATING WITHIN SAID SYSTEM, THE MAGNITUDES OF SAID USEFUL AND PARASITIC IMPULSES BEING SUBJECT TO UNCONTRLLABLE DIRFTS, A CONTROLLABLE SUPPLY OF VOLTAGE FOR ENERGIZING SAID SYSTEM AND FOR CONTROLLING THE MAGNITUDES OF SAID IMPULSES, A THRESHOLD ELEMENT CONNECTED TO THE OUTPUT OF SAID SYSTEM FOR SELEETING ONLY THOSE IMPULSES ABOVE A PREDETERMINE THRESHOLD VALUE, SAID THRESHOLD VALUE HAVING DEFINITE RELATION TO THE MAGNITUDES OF SAID IMPULSES, AN ARRANGEMENT FOR MAINTAINING SAID RELATION IN THE PRESENCE OF SAID DRIFTS, SAID ARRANGEMENT COMPRISING MEANS RESPONSIVE TO ANY DEPARTURE OF SAID IMPULSES SELECTED FROM THEIR NORMAL AMPLI