Linear-accelerator X-ray output: a multicentre chamber-based intercomparison study in Australia and New Zealand

Martin Ebert, S.J. Howlett, K. Harrison, D. Cornes, C.S. Hamilton, J.D. Denham

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    9 Citations (Scopus)

    Abstract

    This paper describes the process and results of a survey of linear accelerator outputs as part of an Australasian Level III Dosimetry Intercomparison. This study involved the measurement of accelerator output under reference conditions ('Level 1') with a small-volume ionisation chamber in water for 47 beams at 36 radiotherapy centres using the IAEA TRS 398 dose-to-water protocol. The mean ratio of measured to locally-determined accelerator output was 1.003 +/- 0.009 (1 standard deviation) with a range from 0.981 to 1.024. No correlation could be found between output ratio and accelerator type or local output calibration protocol. The small-volume chamber used satisfied most requirements for the study though showed some variation in sensitivity via repeated cross-calibration with a chamber calibrated at a primary standards laboratory.
    Original languageEnglish
    Pages (from-to)255-266
    JournalAustralasian Physical & Engineering Sciences In Medicine
    Volume31
    Issue number4
    DOIs
    Publication statusPublished - 2008

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