This work quantified differences between recommendations of the TG-51 and TG-51 addendum reference dosimetry protocols. Reference dosimetry was performed for flattened photon beams with nominal energies of 6, 10, 15, and 23 MV, as well as flattening-filter free (FFF) beam energies of 6 and 10 MV, following the recommendations of both the TG-51 and TG-51 addendum protocols using both a Farmer ionization chamber and a scanning ionization chamber with calibration coefficients traceable to absorbed dose-to-water (D ) standards. Differences in D determined by the two protocols were 0.1%-0.3% for beam energies with a flattening filter, and up to 0.2% and 0.8% for FFF beams measured with the scanning and Farmer ionization chambers, respectively, due to k determination, volume-averaging correction, and collimator jaw setting. Combined uncertainty was between 0.91% and 1.2% (k = 1), varying by protocol and detector.
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| http://dx.doi.org/10.1002/acm2.12110 | DOI Listing |
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