Radiation measurement instrument having stabilization means

Claim 1

AN IMPROVED RADIATION MEASUREMENT INSTRUMENT COMPRISING: (A) A FIRST EXTERNAL SOURCE OF RADIATION HAVING A FIRST ENERGY LEVEL, (B) A SECOND INTERNAL SOURCE OF RADIATION HAVING A SECOND ENERGY LEVEL, (C) A DETECTOR MEANS RESPONSIVE TO RANDOM-IN-TIME RADIATION PULSES EMANATING FROM SAID FIRST EXTERNAL AND SAID SECOND INTERNAL RADIATION SOURCES AND GENERATING RESPECTIVE FIRST MEASURED AND SECOND CONTROL SIGNALS HAVING EQUIVALENT ENERGY LEVEL PEAKS, (D) AN INTERMEDIATE CIRCUIT MEANS INCLUDING A PLURALITY OF CHANNELS FOR SORTING SAID FIRST MEASURED AND SECOND CONTROL SIGNALS ACCORDING TO RESPECTIVE ENERGY LEVELS, AT LEAST FIRST AND SECOND CHANNELS OF SAID PLURALITY OF CHANNELS ADAPTED TO CARRY PREDETERMINED PORTIONS OF THE TOTAL RANDOM-IN-TIME CONTROL PULSES THAT DEVELOP THE ENERGY LEVEL PEAK OF SAID SECOND CONTROL SIGNAL, (E) SAID INTERMEDIATE CIRCUIT MEANS RESPONSIVE TO SAID FIRST MEASURED AND SECOND CONTROL SIGNALS AND GENERATING A RESPECTIVE MEASURED SIGNAL AND A FEEDBACK CONTROL SIGNAL THAT HAS A SELECTIVELY VARIABLE ENERGY LEVEL THAT REFLECTS THE DIVISION OF THE TOTAL RANDOM-INTIME CONTROL PULSES SORTED BY SAID INTERMEDIATE MEANS, AND (F) A DISPLAY MEANS RESPONSIVE TO SAID MEASURED SIGNAL FOR DISPLAYING SAID MEASURED SIGNAL, (G) AT LEAST ONE OF SAID DETECTOR AND INTERMEDIATE MEANS RESPONSIVE TO SAID FEEDBACK CONTROL SIGNAL TO AUTOMATICALLY ADJUST THE RADIATION INSTRUMENT SO THAT SAID FIRST AND SECOND CHANNELS CARRY SAID PREDETERMINED PORTIONS OF THE TOTAL RANDOM-IN-TIME CONTROL PULSES AND SATISFY A PREDETERMINED ENERGY LEVEL PULSE SORTING SCHEDULE.