Abstract
We evaluated and reported the characteristics of flatness, dose distribution, and dose measurements in small radiation fields. The diameter of the small radiation fields were from 0.7cm to 2.9cm at the isocenter and the collimator built in the accelerator head was set for 4×4cm^2 with supplemental collimator placed 56cm from the target. The flatness and the characteristics of dose distribution were measured in these small radiation fields in the narrow beam methods with 6MV and 10MV X-ray beams from the linear accelerator, applying a three dimensional fixed multi-irradiation technique. The sensitive volume effects upon the measurements of field factor and tissue peak dose ratio (TPR) in the small radiation fields were measured by JARP ionization chamber, shallow ionization chamber, and Si-semiconductor detector, because of each own sensitive volume. We concluded that the Si-semiconductor detector with the smallest sesitive volume was the most suitable for the small field dosimeter.
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