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Updated: Jul 21, 2025
Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
Construction of a radiation beam scanner and investigation of volume averaging correction factor effects on
Joonas Tikkanen1,2,3, Jan Morelius1, Teemu Siiskonen1,2,3
1Measurements and environmental monitoring, Radiation and Nuclear Safety Authority (STUK), Jokiniemenkuja 1, Vantaa FI-01370, Finland.
Abstract:
In radiation beam-profile measurements, an accurate positioning of the detector with high position resolution is essential. For this purpose, we built a scanning device capable of moving a detector in three dimensions (3D) using mainly parts from a commercial 3D-printer. The accuracy and repeatability of movement was tested with caliper, laser displacement sensor and repeated 60Co beam-profile measurements in a water phantom. The results from the caliper and the sensor showed position accuracy for the scanner to be better than $\pm$150 μm. The standard deviation of the error in position from laser sensor measurements was approximately 30 μm, and the beam profile scans showed a maximum deviation from the mean position of 50 μm. The effect of volume averaging correction factors on 60Co beam-profile was investigated with two different sized ionization chambers. The differences in the profiles were reduced significantly after applying the correction factors.
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