Abstract
The effect of low (LDR) and medium dose rate (MDR) of γ irradiation at low doses (0–100 kGy) on the structural and chemical changes of microporous polysulfone (PSf) membrane has been studied using UV–vis, FTIR, SEM and dead-end filtration techniques. PSf membrane was cast by phase inversion method. Irradiation was done at room temperature in air media. The doses chosen were 0–100 kGy for LDR and 0–50 kGy for MDR; they were below and above sterilization dose. Analysis of UV–vis and IR spectra and SEM images obtained suggested that chain scissions and crosslink had occurred simultaneously in the irradiated membranes in both cases. This radio-oxidation effects observed start at a very low dose i.e. 1.66 kGy and increase with increase in dose. It is supported by the flux values obtained; it is increased with increase in dose. The results indicate that a very low dose γ irradiation was able to change the physicochemical characteristics of microporous PSf membrane which depend on dose rate of exposure.
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