Patent ID: 7368726
Filing Date: 2008-05-06
Classification: G01T

Abstract:
1. A method for measuring high-energy radiation flux, comprising: applying a positive voltage across electrodes in an ion chamber filled with a gas capable of forming charged ions by a high-energy radiation; measuring a positive ion current signal related to ion currents induced by the positive voltage; applying a negative voltage across the electrodes; measuring a negative ion current signal related to ion currents induced by the negative voltage; determining a magnitude of the high-energy radiation flux based on the positive and negative ion current signals; outputting the result of the magnitude of the high-energy radiation flux; applying a ramping voltage across the electrodes such that the ion chamber conducts a current small enough that ion transport does not occur; and determining a gain, wherein an amplitude of the positive and negative voltage is adjusted such that ions in the ion chamber are subject to consumption based on recombination of the ions.