Sensitivity and stability of the Fricke–gelatin–xylenol orange gel dosimeter
نویسندگان
چکیده
Spectrophotometric measurements of the Fricke–gelatin–xylenol orange (FGX) gel dosimeter demonstrated reproducible linear dose response up to 25Gy. However, oxidation processes continue post-irradiation, affecting the response of this dosimetry system. Additional oxygenation during preparation increases the sensitivity of the gel but does not improve the auto-oxidation stability of the dosimeter post-irradiation. A suitably stable gel composition that is recommended for radiotherapy dosimetry measurements contains 0.5mM ferrous ammonium sulphate, 50mM sulphuric acid, 0.15mM xylenol orange and 3.0% by weight gelatin. r 2008 Elsevier Ltd. All rights reserved.
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