OBLIQUE-INCIDENCE OF THE ELECTRON-BEAMS - TLD AND IONIZATION DOSIMETRY

The complex dosimetry problems connected with ionization chambers used in electron disequilibrium conditions for oblique incidence of the el ectron beams are presented. Depth dose measurements along central axis show inadequate accuracy in the chamber positioning. This paper claim s that thermoluminescence (TLD) dosimetry is more suitable to overcome these difficulties. TLD measurements, angle of incidence 0 degrees, 1 5 degrees, 30 degrees, 45 degrees and 10 MeV energy linear accelerator , were fitted by analytical functions both for depth-dose curves and o bliquity factors. The functions fit the experimental values with an ac curacy of 3.5% for depth-dose curves and 2.5% for obliquity factors, r espectively.