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.
|Journal||Australasian Physical & Engineering Sciences In Medicine|
|Publication status||Published - 2008|
Ebert, M., Howlett, S. J., Harrison, K., Cornes, D., Hamilton, C. S., & Denham, J. D. (2008). Linear-accelerator X-ray output: a multicentre chamber-based intercomparison study in Australia and New Zealand. Australasian Physical & Engineering Sciences In Medicine, 31(4), 255-266. https://doi.org/10.1007/BF03178596