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  • Title: Investigation on the reduction of electron contamination with a 6-MV x-ray beam.
    Author: Parthasaradhi K, Prasad SG, Rao BM, Lee Y, Ruparel R, Garces R.
    Journal: Med Phys; 1989; 16(1):123-5. PubMed ID: 2493564.
    Abstract:
    Experimental investigations have been carried out on the reduction of electron contamination of a 6-MV x-ray beam of Clinac model 1800 for square field sizes 5 X 5 to 30 X 30 cm2 in steps of 5 cm and for rectangular field sizes 19 X 7 and 7 X 19 cm2. The electron contamination of both the open beam and the beam with the tray can be effectively reduced by placing a lead foil filter immediately below the blocking tray. Measurements at 100-cm source-skin distance with filter in place showed a reduction in dose in the buildup region and also a displacement of the location of Dmax to greater depths, even for small field sizes such as 10 X 10 cm2.
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