D. Novković, M. Kovačević, D. Veličković, S. Stanković
Institute of Nuclear Sciences, Vinča, P.O.Box 522, YU-11001, Belgrade, Yugoslavia
The response of ionization chambers made of graphite and air-equivalent material was measured in the X
and gamma radiation energy range from 30 keV to 1250 keV. The energy independent response in the whole
energy range was found for the air-equivalent ionization chambers with walls of 2 mm and 3 mm. The
composition of the air-equivalent material was: 0.358 polystyrene +0.477 graphite +0.140 Al2O3 + 0.025 Al.