Investigation on the reduction of electron contamination with a 6‐MV x‐ray beam | Zendy

Parthasaradhi K. | Zendy; Prasad S. Guru | Zendy; Rao B. M. | Zendy; Lee Y. | Zendy; Ruparel R. | Zendy; Garces R. | Zendy

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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 .

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