Abstract
The aim of this study was to investigate the chemistry of the PAGAT dosimeters when doped with saccharides and irradiated' using NMR spectroscopy. Three batches of PAGAT gel dosimeters were manufactured. Two of them were doped with 20 % glucose and sucrose' respectively. For each batch' one sample was left unirradiated while the remaining samples were irradiated to different doses. After irradiation' NMR spectra were obtained which clearly showed the composition of the dosimeter and the change in monomer concentration caused by irradiation. In addition' it revealed that the saccharides did not directly participate in the chemical process before and during irradiation but the addition of saccharides resulted in a higher consumption rate of the monomers.
Highlights
The radiation sensitivity of polymerizing dosimeters is based on polymerization of monomers
The obtained nuclear magnetic resonance (NMR) spectra for all samples are shown in figure 1
The specific compounds have been identified by recording NMR spectra of pure compounds dissolved in deuterium oxide
Summary
The radiation sensitivity of polymerizing dosimeters is based on polymerization of monomers This radiation-induced polymerization reaction reduces the spin-spin relaxation time (T2) and dose read out can be performed using nuclear magnetic resonance (NMR) [1]. This results in a relation between the relaxation rate (R2=1/T2) and the delivered dose. Studies have shown that the response to irradiation of such dosimeter can be increased by adding saccharides [2], the chemistry has, to our knowledge, not yet been explored. The aim of this study was to investigate the difference in chemistry between PAGAT and saccharide-doped PAGAT dosimeters before and after irradiation by use of NMR spectroscopy
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