Extrapolated surface dose measurements with radiochromic film | Zendy

Butson Martin J. | Zendy; Yu Peter K. N. | Zendy; Metcalfe Peter E. | Zendy

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Extrapolated surface dose measurements with radiochromic film

Author(s) -

Butson Martin J.,

Yu Peter K. N.,

Metcalfe Peter E.

Publication year - 1999

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 - 10.1118/1.598539

Subject(s) - ionization chamber , dosimetry , materials science , extrapolation , percentage depth dose curve , optics , beam (structure) , ionization , dose profile , surface (topology) , photon , atomic physics , physics , nuclear medicine , ion , medicine , mathematical analysis , geometry , mathematics , quantum mechanics

A radiochromic film extrapolation method is described for the measurement of surface dose from high energy photon beams. Extrapolated central axis entrance surface dose using Gafchromic film for a 10 × 10 cm 2field size is 15 % ± 2 % and 13 % ± 2 % of D maxfor 6 and 10 MV x rays, respectively. Extrapolated surface dose for a 30 × 30 cm 2field with a 10 mm perspex block tray is 49 % ± 2 % and 48 % ± 2 % of D maxfor 6 and 10 MV beams, respectively. All results agree with uncorrected Attix parallel plate ionization chamber surface ionization within 4% for the same beam energies and configurations.

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