Effects of a radiation dose in gamma-ray irradiation fields on holographic gratings formed by liquid crystal composites

Abstract

The radiation resistance of liquid crystal diffraction gratings was investigated using a cobalt 60 gamma radiation source until the radiation reached a total dose of 1000 Mrad, corresponding to a very severe amount of radiation. The optical properties of gratings exposed to gamma-ray radiation were discussed with internal observations such as polarization optical microscopy and scanning electron microscopy. The radiation resistance of liquid crystal diffraction gratings for gamma-ray irradiation has been explained by associating the optical characteristic measurements for liquid crystal composite materials, including a glass substrate, by analyzing the internal volume grating structure. The radiation resistance for anisotropic diffraction in the HPDLC grating has been explained by the modulation of the LC orientation in the polymer network configuration affected by the gamma-ray irradiation.

Simulation of Light Distribution in Gamma Irradiated UHMWPE Using Monte Carlo Model for Light (MCML) Transport in Turbid Media: Analysis for Industrial Scale Biomaterial Modifications

“…Therefore, the increase in T d as a function of incident wavelength is quite understandable; however, the behavior T d for 100 kGy irradiated (highlighted above) is because of higher values of cross-linking networks for the 100 kGy irradiated samples [ 40 ]. It is well documented that the cross-linking networks within the UHMWPE matrix are responsible for aligning the randomly distributed crystalline lamellae in the amorphous slough of CH 2 units [ 17 , 41 , 42 , 43 , 44 ]. Therefore, the 100 kGy irradiated sample is more oriented and transparent as compared to the 30 kGy one, which is observed experimentally (see Figure 2 ).…”