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Investigation on the reduction of electron contamination with a 6‐MV x‐ray beam
Author(s) -
Parthasaradhi K.,
Prasad S. Guru,
Rao B. M.,
Lee Y.,
Ruparel R.,
Garces R.
Publication year - 1989
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596399
Subject(s) - cathode ray , beam (structure) , contamination , reduction (mathematics) , materials science , tray , x ray , electron , optics , foil method , physics , mathematics , nuclear physics , geometry , composite material , mechanical engineering , ecology , biology , engineering
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 5×5 to 30×30 cm 2 in steps of 5 cm and for rectangular field sizes 19×7 and 7×19 cm 2 . 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 D max to greater depths, even for small field sizes such as 10×10 cm 2 .