Automatic hand counter for alpha particle counting

Claim 1

A RADIATION COUNTER OF THE TYPE DISCLOSED COMPRISING IN AN OPERATIVELY ASSOCIATED COMBINATION A HIGH VOLTAGE SUPPLY MEANS OPERATIVELY CONNECTED TO PROBE MEANS, SAID PROBE MEANS BEING ADAPTED TO SENSE RADIOACTIVE PARTICLES AND GIVE OFF PULSES INDICATIVE TO THE DEGREE OF RADIATION, PULSE AMPLIFYING MEANS ADAPTED TO RECEIVE SAID PULSE, A COUNTER MEANS INCLUDING A CHARGING CIRCUIT COUPLED TO RECEIVE THE AMPLIFIED PULSES, NORMALLY NON-CONDUCTING THYRATRON MEANS COUPLED TO SAID CHARGING CIRCUIT, BIAS ADJUSTING MEANS OPERATIVELY ASSOCIATED WITH SAID THYRATRON MEANS AND ADAPTED TO BE OVERCOME BY THE CHARGING CIRCUIT TO PROVIDE CONDUCTION OF THE THYRATRON MEANS, MEANS FOR COUPLING THE OUTPUT OF SAID THYRATRON MEANS WITH SIGNAL MEANS, AND PUSH BUTTON SWITCH MEANS IN SAID COUNTER MEANS FOR DE-ENERGIZING SAID THYRATRON MEANS AND SHORTING SAID CHARGING CIRCUIT WHEN DEPRESSED AND FOR ENERGIZING SAID THYRATRON MEANS AND REMOVING SAID SHORT WHEN RELEASED.