Measurement and comparison of head scatter factor for 7Â MV unflattened (FFF) and 6Â MV flattened photon beam using indigenously designed columnar mini phantom

There were significant differences in Sc values measured for 6MV-FB and unflattened 7MV-UFB photon beams over the range of field sizes from 10 cm × 10 cm to 40 cm × 04 cm. Different results were obtained for measurements performed with low-Z and high-Z mini phantoms.