Insertion effects of the aluminium on the sensitive volume of a parallel plates ionization chamber

In this work one searched to analyze the influence of the materials of the walls of a chamber of ionization in its energy dependence and capacity in collecting electrons. For in such a way it varied constitution of the walls of the chamber, with different ratios in area, of polycarbonate and aluminum, respectively with thickness of 0.25 and 0.01 mm. The energy dependence, in the band of energy used in radiodiagnostic, can be reduced of 10 for 5% when an aluminum leaf is added with 8 cm 2 of area, on a window of polycarbonate with 24 cm2 of area. (author)