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      Peripheral dose outside applicators in electron beams.

      1 ,
      Physics in medicine and biology
      IOP Publishing

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          Abstract

          The peripheral dose outside the applicators in electron beams was studied using a Varian 21 EX linear accelerator. To measure the peripheral dose profiles and point doses for the applicator, a solid water phantom was used with calibrated Kodak TL films. Peak dose spot was observed in the 4 MeV beam outside the applicator. The peripheral dose peak was very small in the 6 MeV beam and was ignorable at higher energies. Using the 10 x 10 cm(2) cutout and applicator, the dose peak for the 4 MeV beam was about 12 cm away from the field central beam axis (CAX) and the peripheral dose profiles did not change with depths measured at 0.2, 0.5 and 1 cm. The peripheral doses and profiles were further measured by varying the angle of obliquity, cutout and applicator size for the 4 MeV beam. The local peak dose was increased with about 3% per degree angle of obliquity, and was about 1% of the prescribed dose (angle of obliquity equals zero) at 1 cm depth in the phantom using the 10 x 10 cm(2) cutout and applicator. The peak dose position was also shifted 7 mm towards the CAX when the angle of obliquity was increased from 0 to 15 degrees.

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          Author and article information

          Journal
          Phys Med Biol
          Physics in medicine and biology
          IOP Publishing
          0031-9155
          0031-9155
          Jun 21 2006
          : 51
          : 12
          Affiliations
          [1 ] Radiation Medicine Program, Princess Margaret Hospital, University of Toronto, ON M5G 2M9, Canada.
          Article
          S0031-9155(06)19443-9
          10.1088/0031-9155/51/12/N01
          16757855
          a6d521f6-4725-4c16-ace0-319ca074f9dc
          History

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