A model for post-irradiation effects in polymer gel dosimeters Export

@article{citeulike:3210449, 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, K. and Deene, De Y. and Bussche, Vanden E. and Wagter, De C.}, citeulike-article-id = {3210449}, citeulike-linkout-0 = {http://dx.doi.org/10.1088/1742-6596/3/1/028}, doi = {10.1088/1742-6596/3/1/028}, journal = {Journal of Physics: Conference Series}, keywords = {dosimetry, gel}, pages = {205--208}, posted-at = {2008-09-09 16:44:04}, priority = {0}, 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} }

TY - JOUR ID - citeulike:3210449 L3 - citeulike-article-id:3210449 N2 - 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. JF - Journal of Physics: Conference Series EP - 208 TI - A model for post-irradiation effects in polymer gel dosimeters VL - 3 SP - 205 KW - dosimetry KW - gel AU - Vergote, K AU - Deene, De AU - Bussche, Vanden AU - Wagter, De PY - 2004/// UR - http://dx.doi.org/10.1088/1742-6596/3/1/028 ER -