Raman and near-IR study on proton irradiated CR-39 detector and the effect of air-leak on damage formation

Formation of CO2 gas and OH groups in CR-39 plastics due to gamma-ray and ions irradiation

“…The absorption at peaks for C=O and C-O-C decreases with the fluence, while the absorbance for CH 2 slightly increases with the fluence. In the previous Raman study, the intensity of CH 2 slightly decreased (Yamauchi et al, 2001). It should be a reflection of the complementary relation between IR and Raman spectra.…”

“…However, the resultant structure of the damage, in other words, what is left after the CO 2 release, is still not clear. As one of the possible end-points, the OH group has been observed (Yamauchi et al, 2000(Yamauchi et al, , 2001. It is difficult to discriminate the OH group absorption band from that of adsorbed water because of the hygroscopic property of CR-39 (Malek et al, 2000;Yamauchi et al, in press).…”

Gamma irradiation induced chemical and structural modifications in PM-355 polymeric nuclear track detector film

“…It is clear from the figure that the Raman intensity of most of the peaks increased, and some peaks disappeared, suggesting that some structural changes occur in the polymer film after gamma irradiation. In the pristine PM-355 film, a number of peaks at 1124, 1288, 1455, 1749 and 2962 cm À1 are observed confirming its fundamental structure, which is similar to CR-39 polymer [26,27]. The highest intensity band at 1124 cm À1 is assigned to C-O-C stretching, whereas another strong intensity band at 2962 cm À1 is due to asymmetric CH 2 .…”

Atomic force microscopy and Raman scattering studies of femtosecond laser-induced nanohillocks on CR-39

“…This can be due to fact that surface becomes more and more hydrogen deficient resulting in the saturation effect. Decrease in a -CH 2 -group density in CR-39 after ions and proton irradiation has already been observed [6,34]. Such dehydrogenation caused by irradiation may lead to the formation of the unsaturated bonds and, hence, increase the polar components [35].…”