Calculation of electron contamination doses produced using blocking trays for 6 MV X-rays

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Scopus Citations
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Original languageEnglish
Pages (from-to)99-102
Journal / PublicationRadiation Measurements
Volume35
Issue number2
Publication statusPublished - 2002

Abstract

Calculation of electron contamination doses whilst using blocking trays in radiotherapy is achieved by comparison of measured absorbed dose within the first few centimeters of a water phantom. Electron contamination of up to 28% of maximum dose is produced at the central axis of the beam whilst using a 6 mm Perspex blocking tray for a 30 cm × 30 cm field. The electron contamination is spread over the entire field reducing slightly towards the edge of the beam. Electron contamination from block trays is also present outside the primary collimated X-ray beam with more than 20% of the maximum dose deposited at the surface, 5 cm outside the primary collimated beam at a field size of 40 cm × 40 cm. The electron contamination spectrum has been calculated from measured results. © 2002 Published by Elsevier Science Ltd.