Abstract
2 mm and 1 mm overlap and gap produced 22% and 13% overdose, 21% and 15% underdose respectively. At 0 mm the dose nonuniformity is about 2%. The difference in dose profiles along the junction obtained from films and TPS wasn’t statistically significant. TPS and linear accelerator were in accordance with each other. Besides the penumbra and scattered radiation also contributed to the uniformity of dose distribution along the junction point.
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