Effect of the exothermal polymerization reaction on polymer gel dosimetric measurements

Discrepancies in polymer gel dosimetric measurements have been observed between containers of different sizes receiving the same radiation dose. We hypothesized that these deviations are caused by a change in the rate of polymerization due to internal heat increase in the gel containers resulting fr...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-11, Vol.250 (1), p.012018
Main Authors: Sedaghat, Mahbod, Bujold, Rachel, Lepage, Martin
Format: Article
Language:English
Subjects:
Containers
Cooling rate
Exothermic reactions
Gelatin
Magnetic resonance imaging
Physics
Polyacrylamide
Polymer gels
Polymerization
Polymers
Radiation dosage
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Summary:Discrepancies in polymer gel dosimetric measurements have been observed between containers of different sizes receiving the same radiation dose. We hypothesized that these deviations are caused by a change in the rate of polymerization due to internal heat increase in the gel containers resulting from the exothermic polymerization of monomers. Here, we test this hypothesis in a polyacrylamide gel dosimeter by recording the temperature in glass phantoms of different sizes during and after irradiation. The dose response of the samples was determined with magnetic resonance imaging. The difference of R2 values along the depth of the containers was below ±1%. We discuss that this small difference can be attributed to variations in the rate of gelatin cooling during manufacture rather than to the measured heat increase during irradiation.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/250/1/012018