Journal of Medical Physics
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Year : 2004  |  Volume : 29  |  Issue : 1  |  Page : 9-16

Comparison Of IREA TRS 398, TRS 381 And AAPM TG 51 protocols For High Energy Electron Beams



Correspondence Address:
Sherly Saju


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The objective of this study is to compare the measured absorbed dose to water (D) between various protocols, such as IAEA TRS 398, TRS 381 and AAPM TG 51, for the clinical electron energies of 6,9, 12r15 and 18 MeV. Two cylindrical chambers, PTW 30001and NE 2571, and two plane parallel chambers, PTW Roos and PTW Markus chambers, were used. All chambers have been calibrated for 60Co quality, in terms of both absorbed dose (NDx) and air kerma (Nk), traceable to Secondary Standards Dosimetry Laboratory (SSDL), BARC, India. Absorbed dose- to- water ratios TRS 398/TG 51 and TRS 398/TRS 381 are graphically represented as a function of R 50. To study the difference in the absorbed dose to water, basic data from all the protocols are analyzed. In case of cylindrical chambers and plane parallel Roos chamber, maximum deviations of 0.7% between TRS 398 and TG 51 and 2% between TRS 398 and TRS 381 are observed. In the case of Markus chamber, maximum deviations of 1.8% between TRS 398 and TG 51 and 0.5% between TRS 398 and TRS 381 are obtained. Between TRS 398 and TRS 381, sources of variation are calibration factors such as & Ndx and Swak data. Though the difference between the protocols is not very significant, the change could be justified for the homogeneity in dosimetry.


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