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- W2000269142 abstract "At the Northern Illinois University Institute for Neutron Therapy at Fermilab, the clinical tissue-equivalent ionisation chamber response is measured every treatment day using a cesium source that was configured to match readings obtained at the National Bureau of Standards. Daily measurements are performed in air using the air-to-tissue dose conversion factors given in AAPM Report #7. The measured exposure calibration factors have been tabulated and graphed as a function of time from 1978 to present. For A-150 plastic ionisation chambers, these factors exhibit a sinusoidal variation with a period of approximately 1 y and amplitude of +/- 1%. This variation, attributable to the hygroscopic nature of A-150 plastic, is correlated with the relative humidity of the facility, and is greater than the humidity corrections for gas described in the literature. The data suggest that chamber calibration should be performed at least weekly to accommodate these variations." @default.
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- W2000269142 date "2007-05-13" @default.
- W2000269142 modified "2023-09-26" @default.
- W2000269142 title "Stability of A-150 plastic ionisation chamber response over a 30-y period" @default.
- W2000269142 cites W2338319530 @default.
- W2000269142 doi "https://doi.org/10.1093/rpd/ncm126" @default.
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