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In radiation beam-profile measurements, an accurate positioning of thedetector with high position resolution is essential. For this purpose, we builta scanning device capable of moving a detector in three dimensions using mainlyparts from a commercial 3D-printer. The accuracy and repeatability of movementwas tested with caliper, laser displacement sensor, and repeated $^{60}$Cobeam-profile measurements in a water phantom. The results from the caliper andthe sensor showed position accuracy for the scanner to be better than $\pm$150$\mu$m. The standard deviation of the error in position from laser sensormeasurements was approximately 30 $\mu$m and the beam profile scans showed amaximum deviation from the mean position of 50 $\mu$m. The effect of volumeaveraging correction factors on $^{60}$Co beam-profile was investigated withtwo different sized ionization chambers. The differences in the profiles werereduced significantly after applying the correction factors.

Construction of a radiation beam scanner and investigation of volume averaging correction factor effects on beam-profile