Parameter optimization of a radiation detector of ionization chamber type using test point facility

The problem of radiation doses measurement is present in research, in practical activity, every time when it is necessary to evaluate radiation effects due to the radiation energy absorbed in matter. Among the great number of known methods, the free air ionization chamber method and cavity ionization chamber method are most viable because these detectors represent the reference standards for national metrology and ionization radiation dosimeter laboratories. They use the electronic equilibrium principle and Brag-Gray equation and they are the basic detectors for exposure rate determination and/or absorbed dose in different materials, including the air. For the development of the above methods, we used a hardware configuration - Keithley electrometer- and a particular software - Keithley 2000 and Test Point. Using these two measuring methods, we are able to determine (for gamma, X and beta radiation) the exposure, exposure rate, dose, dose rate and activity. (authors)