High energy radiation meter

Claim 1

A SYSTEM RESPONSIVE TO HIGH ENERGY RADIATION, SAID SYSTEM BEING EFFECTIVE THROUGHOUT A WIDE RANGE OF RADIATION INTENSITY AND COMPRISING A VACUUM TUBE OF ELECTROMETER TYPE HAVING A CATHODE, A PLATE AND A CONTROL GRID, AN ELECTRIC CIRCUIT CONNECTED EXTERNALLY OF THE TUBE BETWEEN THE CATHODE AND THE PLATE AND INCLUDING ELECTRIC POWER MEANS FOR RENDERING THE PLATE POSITIVE WITH RESPECT TO THE CATHODE BY A VOLTAGE THAT IS LESS THAN ABOUT 8 VOLTS AND IS INSUFFICIENT TO PRODUCE AN APPRECIABLE NUMBER OF POSITIVE IONS WITHIN THE TUBE, STRUCTURE FORMING AN IONIZATION CHAMBER ADAPTED TO CONTAIN AN IONIZABLE GAS AND INCLUDING ELECTRICALLY CONDUCTIVE AND MUTUALLY INSULATED POSITIVE AND NEGATIVE ELECTRODES, THE NEGATIVE ELECTRODE BEING ELECTRICALLY ISOLATED FROM SAID PLATE CIRCUIT AND BEING CONNECTED DIRECTLY TO THE CONTROL GRID OF THE TUBE TO FORM AN ELECTRIC ELEMENT AT A FLOATING POTENTIAL, THE VALUE OF THAT POTENTIAL BEING DETERMINED CONTINUOUSLY AND SUBSTANTIALLY EXCLUSIVELY BY THE EQUILIBRIUM BALANCE BETWEEN THE POSITIVE SPACE CURRENT TO THE ELECTRODE AND THE NEGATIVE SPACE CURRENT TO THE GRID, THE RESULTING EQUILIBRIUM GRID BIAS ACTING TO PRODUCE A CURRENT IN THE PLATE CIRCUIT THAT VARIES SUBSTANTIALLY LOGARITHMICALLY WITH THE INTENSITY OF HIGH ENERGY RADIATION IN THE IONIZATION CHAMBER, AND MEANS RESPONSIVE TO THE MAGNITUDE OF SAID CURRENT IN THE PLATE CIRCUIT.

Claim 2

A SYSTEM RESPONSIVE TO HIGH ENERGY RADIATION, SAID SYSTEM BEING EFFECTIVE THROUGHOUT A WIDE RANGE OF RADIATION INTENSITY AND COMPRISING A VACUUM TUBE OF ELECTROMETER TYPE HAVING A CATHODE, A PLATE AND A CONTROL GRID, AN ELECTRIC CIRCUIT CONNECTED EXTERNALLY OF THE TUBE BETWEEN THE CATHODE AND THE PLATE AND INCLUDING ELECTRIC POWER MEANS FOR RENDERING THE PLATE POSITIVE WITH RESPECT TO THE CATHODE BY A VOLTAGE THAT IS LESS THAN ABOUT 8 VOLTS AND IS INSUFFICIENT TO PRODUCE AN APPRECIABLE NUMBER OF POSITIVE IONS WITHIN THE TUBE, STRUCTURE FORMING AN IONIZATION CHAMBER ADAPTED TO CONTAIN AN IONIZABLE GAS AND INCLUDING ELECTRICALLY CONDUCTIVE AND MUTUALLY INSULATED POSITIVE AND NEGATIVE ELECTRODES, THE NEGATIVE ELECTRODE BEING ELECTRICALLY ISOLATED FROM SAID PLATE CIRCUIT AND BEING CONNECTED DIRECTLY TO THE CONTROL GRID OF THE TUBE TO FORM AN ELECTRIC ELEMENT AT A FLOATING POTENTIAL, THE VALUE OF THAT POTENTIAL BEING DETERMINED CONTINUOUSLY AND SUBSTANTIALLY EXCLUSIVELY BY THE EQUILIBRIUM BALANCE BETWEEN THE POSITIVE SPACE CURRENT TO THE ELECTRODE AND THE NEGATIVE SPACE CURRENT TO THE GRID, THE RESULTING EQUILIBRIUM GRID BIAS ACTING TO PRODUCE A CURRENT IN THE PLATE CIRCUIT THAT VARIES SUBSTANTIALLY LOGARITHMICALLY WITH THE INTENSITY OF HIGH ENERGY RADIATION IN THE IONIZATION CHAMBER, AND MEANS RESPONSIVE TO THE MAGNITUDE OF SAID CURRENT IN THE PLATE CIRCUIT.