Abstract: Raman spectroscopy are used to characterize the
chemical changes in normoxic polyhydroxyethylacrylate gel
dosimeter (PHEA) induced by radiation. Irradiations in the low dose
region are performed and the polymerizations of PHEA gels are
monitored by the observing the changes of Raman shift intensity of
the carbon covalent bond of PHEA originated from both monomer
and the cross-linker. The variation in peak intensities with absorbed
dose was observed. As the dose increase, the peak intensities of
covalent bond of carbon in the polymer gels decrease. This point out
that the amount of absorbed dose affect the polymerization of
polymer gels. As the absorbed dose increase, the polymerizations
also increase. Results verify that PHEA gel dosimeters are sensitive
even in lower dose region.