1. Preparation of polymer gel dosimeters based on less toxic monomers and gellan gum.
- Author
-
Hiroki, A, Sato, Y, Nagasawa, N, Ohta, A, Seito, H, Yamabayashi, H, Yamamoto, T, Taguchi, M, Tamada, M, and Kojima, T
- Subjects
POLYMER colloids ,DOSIMETERS ,RADIOTHERAPY ,RADIATION ,ABSORPTION - Abstract
New polymer gel dosimeters consisting of 2-hydroxyethyl methacrylate (HEMA), triethylene glycol monoethyl ether monomethacrylate (TGMEMA), polyethylene glycol 400 dimethacrylate (9G), tetrakis (hydroxymethyl) phosphonium chloride as an antioxidant, and gellan gum as a gel matrix were prepared. They were optically analyzed by measuring absorbance to evaluate a dose response. The absorbance of the polymer gel dosimeters that were exposed to
60 Co γ-rays increased with increasing dose. The dosimeters comprising HEMA and 9G showed a linear increase in absorbance in the dose range from 0 to 10 Gy. The dose response depended on the 9G concentration. For others comprising HEMA, 9G and TGMEMA, the absorbance of the polymer gel dosimeters drastically increased above a certain dose, and then leveled off up to 10 Gy. The optical variations in these polymer gel dosimeters were also induced by x-irradiation from Cyberknife radiotherapy equipment. Furthermore, the exposed region of the latter polymer gel dosimeter exhibited a thermo-responsive behavior. [ABSTRACT FROM AUTHOR]- Published
- 2013
- Full Text
- View/download PDF