Abstract
The dose measurements have been made on the central axis of the beam with an ionization chamber placed in a water phantom at approximate depths of 3 and 5 cm. The amount of electron scattering is found to be as much as 7% higher for circular cones compared to equivalent square cones. The above effect is believed to be mainly due to the presence of the field defining lead rings inside the circular cones. In the energy range studied, the contribution of electrons scattered by the precollimator together with the rectangular cones first increases rapidly and then decreases as the field size is increased. A series of dose measurements have also been done with the adjustable precollimator without cones and variations of relative doses as a function of field size and energy were compared with data obtained using the precollimator with attached cones.
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