Interferometric investigation of the effect of gamma radiation on the refractive index of CR-39 polymer

The influence of gamma radiation on the electro-optical characteristics of CR-39 polymer

“…Our interpretation of this observation comes from the formation of covalent bonds between different chains, bringing about a reduction in the anisotropic behaviour up to 30 kGy, after which an isotropic structure has been attained. This is recognised as degradation, and the same trend has already been noted by refractive index analysis in previous works [11,14]. Spectroscopic analysis of four of the samples is shown in figure 3.…”

“…It is known that irradiation of polymers causes structural and chemical modifications, bringing about observable changes in physical properties [9][10][11]. Up to now, the physical and chemical modifications caused by gamma irradiation have been studied via different techniques such as optical microscopy, electron microscopy, x-ray analysis, speckle techniques, and refractive index measurements [12][13][14][15][16]. We have not found any reference to the exploitation of electrical capacitance as a diagnosis tool for radiation deformation in the literature we have surveyed, although this approach is sensitively and successfully applied to some molecular cases [17].…”

Effect of γ-ray irradiation on structure formation and optical constants of thermally evaporated rhodamine B thin films

“…[15][16][17][18]. Gamma irradiation with doses up to 40 kGy increases the refractive index of CR-39 polymer and then it decreases with increasing dose to 600 kGy [15]. Exposing MnPc thick films to γ-ray irradiation changed the electronic transition from direct allowed (for unexposed film) to indirect allowed (for irradiated films) and decreased the optical energy gap with the increase in irradiation dose [16].…”

“…The influence of γ-irradiation on the optical properties of some organic thin films has been investigated in Refs. [15][16][17][18]. Gamma irradiation with doses up to 40 kGy increases the refractive index of CR-39 polymer and then it decreases with increasing dose to 600 kGy [15].…”

A modified formula for accurate determination of three‐dimensional birefringence of fiber using modified subfringe integration method

“…El Ghandoor et al () and El Zaiat et al () used simple interferometric technique to measure the variation in refractive index of CR‐39 polymer samples and pure polyvinyl alcohol film, respectively, due to gamma radiation dose in the range from 0 to 600 kGy and they found that the refractive index increases by increasing the dose up to a certain limit, and then starts to decrease again. The effect of ion‐beam irradiation on the refractive indices and birefringence of Dralon fibers was investigated by Hamza, Ghander, Oraby, and Mabrouk () and they observed that the area enclosed under the fringe shift increases with the exposure time increasing.…”