Sensitivity and stability of the Fricke-gelatin-xylenol orange gel dosimeter

J. B. Davies, C. Baldock

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

Spectrophotometric measurements of the Fricke-gelatin-xylenol orange (FGX) gel dosimeter demonstrated reproducible linear dose response up to 25 Gy. 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 0.5 mM ferrous ammonium sulphate, 50 mM sulphuric acid, 0.15 mM xylenol orange and 3.0% by weight gelatin.
Original languageEnglish
Pages (from-to)690-696
Number of pages7
JournalRadiation Physics and Chemistry
Volume77
Issue number6
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Fricke gel
  • Optical absorbance measurement
  • Radiation dosimetry

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