Extrapolated surface dose measurements with radiochromic film
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 2 field size is 15%±2% and 13%±2% of D max for 6 and 10 MV x rays, respectively. Extrapolated...
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| Veröffentlicht in: | Medical physics (Lancaster) 1999-03, Vol.26 (3), p.485-488 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | 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
2
field size is
15%±2%
and
13%±2%
of
D
max
for 6 and 10 MV x rays, respectively. Extrapolated surface dose for a
30×30
cm
2
field with a 10 mm perspex block tray is
49%±2%
and
48%±2%
of
D
max
for 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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| ISSN: | 0094-2405 2473-4209 |
| DOI: | 10.1118/1.598539 |