Abstract
Bolus is a material applied to the surface of a patient for purposes such as compensating irregular patient contour, negating skin sparing, extra attenuating and etc. Unfortunately, because of high cost of super Flab (standard bolus material) in some clinics wet gauze, wet towel or other materials are used as a substitute for superFlab bolus. In order to survey the function of different materials in dose distribution when used as bolus, TLD dosimetry was done on and under bolus materials (superFlab, wet gauze and wet towel) at different depths for 6 MV, 18 MV and ⁶⁰Co photon beams. TLD dosimetry showed that dose dis- tribution of various bolus substances are quite different in each energy. The results confirmed that using wet gauze or wet towel as a substitute for superFlab do not guarantee adequate dose to surface.
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