Nuclear measuring system

Claim 1

RADIATION-DETECTING MEANS COMPRISING THREE RADIATION-SENSITIVE ELEMENTS, EACH OF SAID ELEMENTS BEING ADAPTED TO INTERACT WITH INCIDENT GAMMA RAYS AND TO PRODUCE ELECTRICAL IMPULSES HAVING MAGNITUDES RESPECTIVELY REPRESENTING THE ENERGY ABSORBED IN SAID ELEMENT AS A RESULT OF SUCH INTERACTIONS, A FIRST ADDER FED BY IMPULSES FROM TWO OF SAID DETECTORS AND OPERATIVE TO PRODUCE OUTPUT IMPULSES RESPONSIVELY TO IMPULSES FROM SAID TWO DETECTORS OCCURING IN SUBSTANTIAL TIME COINCIDENCE, SAID RESPECTIVE OUTPUT IMPULSES HAVING MAGNITUDES PROPORTIONAL TO THE SUMS OF THE MAGNITUDES OF SAID COINCIDENT IMPULSES, A SECOND ADDER FED BY IMPULSES FROM ALL THREE OF SAID DETECTORS OPERATIVE TO PRODUCE OUTPUT IMPULSES RESPONSIVELY TO IMPULSES FROM SAID THREE DETECTORS OCCURRING IN SUBSTANTIAL TRIPLE TIME COINCIDENCE, SAID RESPECTIVE OUTPUT IMPULSES FROM SAID SECOND ADDER HAVING MAGNITUDES PROPORTIONAL TO THE SUMS OF THE MAGNITUDES OF SAID TRIPLY COINCIDENT IMPULSES, THE OCCURRENCE OF AN OUTPUT IMPULSE FROM THE SECOND ADDER BEING THEREFORE ALWAYS ACCOMPANIED BY OCCURRENCE OF AN OUTPUT IMPULSE FROM SAID FIRST ADDER, AND MEANS FED BY THE OUTPUT IMPULSES OF SAID TWO ADDERS FOR TRANSMITTING THE OUTPUT IMPULSES OF SAID FIRST ADDER THAT ARE NOT ACCOMPANIED BY COINCIDENT IMPULSES FROM SAID SECOND ADDER AND SELECTIVELY TRANSMITTING THE LARGER OF SUCH IMPULSES WHENEVER OUTPUT IMPULSES ARE PRODUCED SIMULTANEOUSLY BY BOTH OF SAID TWO ADDERS.