Advanced search
1 file | 352.32 KB

A model for post-irradiation effects in polymer gel dosimeters

Author
Organization
Abstract
Soon after the introduction of polymer gel dosimeters in 1993, edge enhancing effects were noticed in these gels near high dose gradient regions at higher dose levels (typically doses beyond the linear dose-R2 relationship). Our research group has also reported on this phenomenon in several studies. It is believed that due to a depletion of monomers in the high dose region after irradiation, a net diffusion occurs of unreacted monomer into this region where it reacts with long-living macroradicals. As a result, dose 'overshoots' can be observed in the gel-measured dose distribution. However, this hypothesis has never been substantiated. When examining the dose-R2 relation post-irradiation, two types of instabilities may be observed: (a) a polymerization reaction and (b) the gelation process of gelatin. The polymerization reaction post-irradiation is also believed to be due to the creation of macroradical products. A mathematical model is proposed that links the temporal instability to the overshoots near high dose gradients. This model is supported by experimental data. The work is still in progress.

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 352.32 KB

Citation

Please use this url to cite or link to this publication:

Chicago
Vergote, Koen, Yves De Deene, Eveline Vanden Bussche, and Carlos De Wagter. 2004. “A Model for Post-irradiation Effects in Polymer Gel Dosimeters.” In Journal of Physics Conference Series, ed. Yves De Deene and Clive Baldock, 3:205–208. Bristol, UK: IOP Publishing.
APA
Vergote, K., De Deene, Y., Vanden Bussche, E., & De Wagter, C. (2004). A model for post-irradiation effects in polymer gel dosimeters. In Yves De Deene & C. Baldock (Eds.), JOURNAL OF PHYSICS CONFERENCE SERIES (Vol. 3, pp. 205–208). Presented at the 3rd International conference on Radiotherapy Gel Dosimetry (DOSGEL 2004), Bristol, UK: IOP Publishing.
Vancouver
1.
Vergote K, De Deene Y, Vanden Bussche E, De Wagter C. A model for post-irradiation effects in polymer gel dosimeters. In: De Deene Y, Baldock C, editors. JOURNAL OF PHYSICS CONFERENCE SERIES. Bristol, UK: IOP Publishing; 2004. p. 205–8.
MLA
Vergote, Koen, Yves De Deene, Eveline Vanden Bussche, et al. “A Model for Post-irradiation Effects in Polymer Gel Dosimeters.” Journal of Physics Conference Series. Ed. Yves De Deene & Clive Baldock. Vol. 3. Bristol, UK: IOP Publishing, 2004. 205–208. Print.
@inproceedings{1184228,
  abstract     = {Soon after the introduction of polymer gel dosimeters in 1993, edge enhancing effects were noticed in these gels near high dose gradient regions at higher dose levels (typically doses beyond the linear dose-R2 relationship). Our research group has also reported on this phenomenon in several studies. It is believed that due to a depletion of monomers in the high dose region after irradiation, a net diffusion occurs of unreacted monomer into this region where it reacts with long-living macroradicals. As a result, dose 'overshoots' can be observed in the gel-measured dose distribution. However, this hypothesis has never been substantiated. When examining the dose-R2 relation post-irradiation, two types of instabilities may be observed: (a) a polymerization reaction and (b) the gelation process of gelatin. The polymerization reaction post-irradiation is also believed to be due to the creation of macroradical products. A mathematical model is proposed that links the temporal instability to the overshoots near high dose gradients. This model is supported by experimental data. The work is still in progress.},
  author       = {Vergote, Koen and De Deene, Yves and Vanden Bussche, Eveline and De Wagter, Carlos},
  booktitle    = {JOURNAL OF PHYSICS CONFERENCE SERIES},
  editor       = {De Deene, Yves and Baldock, Clive},
  issn         = {1742-6588},
  language     = {eng},
  location     = {Ghent, Belgium},
  pages        = {205--208},
  publisher    = {IOP Publishing},
  title        = {A model for post-irradiation effects in polymer gel dosimeters},
  url          = {http://dx.doi.org/10.1088/1742-6596/3/1/028},
  volume       = {3},
  year         = {2004},
}

Altmetric
View in Altmetric