Journal of Medical Physics
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Year : 1989  |  Volume : 14  |  Issue : 2  |  Page : 5-9

Penumbral Dose Distribution Of High Energy X-Ray Beam From A medical Linear Accelerator

Correspondence Address:
Ratna Datta

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Ionization chamber and solid-state dosimeters have been used to investigate the beam profiles of 6 MV X-ray beams from a medical linear accelerator, with special attention being given in the penumbral region. Measurements were done in water for field sizes from 5 cm x 5 cm to 25 cm x 25 cm and at depths of maximum dose (Dmax) to 15 cm. The field widths at 50% of central axis (CR) dose, measured by diode, were found to be larger than those measured by ion chamber for all field sizes and at all depths, except for field sizes less than 16 cm x 16 cm and at depth of (Dm,). The penumbral widths defined as the distance between 8Q% and 20% of CR dose, measured by diode were sharper than those measured by ion chamber, except for field sizes Larger than 15 cm x 15 cm and at depths greater than 10 cm. Comparison of beam profiles and penumbral widths are Presented.

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