Preparation of polymer gel dosimeters based on less toxic monomers and gellan gum.
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.
Japan Atomic Energy Agency, Takasaki, Gunma, 370-1292, Japan.
A
A
Hiroki
Y
Y
Sato
N
N
Nagasawa
A
A
Ohta
H
H
Seito
H
H
Yamabayashi
T
T
Yamamoto
M
M
Taguchi
M
M
Tamada
T
T
Kojima
D005782:Gels; D008689:Methacrylates / Q000737:chemistry; D011108:Polymers / Q000009:adverse effects* / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D012449:Safety
D005782:Gels; D008689:Methacrylates; D011108:Polymers; D011135:Polysaccharides, Bacterial; C008384:methacrylic acid; C048288:gellan gum