Detection, segregation and counting of radiations of different energies

Claim 1

A DEVICE FOR DETECTING THE PRESENCE IN A SPECIMEN TO BE EXAMINED OF LOW ENERGY BETA RADIATIONS, WHICH COMPRISES AN ENCLOSURE HAVING TWO RELATIVELY THIN, CLOSED CHAMBERS ARRANGED IN CLOSE PROXIMITY TO ONE ANOTHER IN A FACE TO FACE, STACKED RELATION, AND EACH CHAMBER CONTAINING A COUNTING GAS, THE FACE WALLS DEFINING SAID CHAMBERS BEING THIN FILMS IMPERVIOUS TO THE PASSAGE THERETHROUGH OF FLUID BUT THIN ENOUGH TO PASS THERETHROUGH LOW ENERGY BETA RADIATIONS, EACH OF SAID CHAMBERS HAVING ANODE AND CATHODE ELEMENTS ARRANGED THEREIN IN SPACED APART RELATION TO ONE ANOTHER FOR CREATING, WHEN A SUBSTANTIAL VOLTAGE DIFFERENTIAL IS ESTABLISHED BETWEEN SUCH ANODE AND CATHODE ELEMENTS IN EACH CHAMBER, AN ELECTRIC FIELD IN THAT CHAMBER, AND MEANS INCLUDING AN ANTICOINCIDENCE COUNTING CIRCUIT FOR EACH CHAMBER INCLUDING THEREIN THE ANODE AND CATHODE ELEMENTS OF THAT CHAMBER, SAID CIRCUITS BEING COUPLED TOGETHER TO CANCEL COUNTING PULSES CREATED IN BOTH CIRCUITS CONCURRENTLY BY RADIATION ENTERING ONE OF SAID CHAMBERS FROM ANY SUCH SPECIMEN THAT MAY BE ADJACENT AN OUTSIDE FACE WALL OF THE PAIR OF CHAMBERS AND PASSING INTO AND CREATING COUNTING PULSES IN BOTH OF SAID CHAMBERS.