New ionization chambers for beta and X-radiation

Abstract

Two new ionization chambers were designed, constructed and tested in beta and X-radiation fields. They have a circular form, a sensitive volume of 0.6 cm3 and collecting electrodes of graphite and aluminium. The short- and long-term stability checks and the lack of current leakage indicate that the present performance of the chambers is comparable to that expected from secondary standards. The differential energy dependence of both chambers permits effective-energy determination of unknown X-radiation fields. The chambers display applicability for 90Sr + 90Y radiation detection. © 1989.