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 language | English |
|---|---|
| Pages (from-to) | 690-696 |
| Number of pages | 7 |
| Journal | Radiation Physics and Chemistry |
| Volume | 77 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2008 |
| Externally published | Yes |
Keywords
- Fricke gel
- Optical absorbance measurement
- Radiation dosimetry