Measurement of dose distribution for Co-60 teletherapy unit

Abstract EN

Both percentage depth dose and off axis dose are usually needed in order to arrive at a suitable treatment plan.

In an attempt to get an isodose curves in the build-up region, the dose distribution from Co-60 teletherapy machine in a planes perpendicular to the beam axis have been measured near the surface and in the build-up region, using LiF-Teflon thermoluminescent dosimeters in a Perspex phantom for (10 x 10 cm²) and (15 x 15 cm²) field size, and for three depths (0.0 g / cm², 0.36 g / cm² and 0.55 g / cm²).

The measured data is computer fitted to an empirical formula using MATLAB program, and the dose distribution for different other depths have been predicted.