Gamma Radiation‐Induced Changes in Trombay Nuclear Waste Glass Containing Iron

Abstract

Alkali-based barium borosilicate glasses having similar composition to the Trombay nuclear research reactor waste base glass containing iron were prepared and irradiated by gamma rays. The radiation-induced defect centers were investigated using electron paramagnetic resonance (EPR) technique. The results showed the formation of silicon hole centers and electron trap centers apart from boron-based oxy hole centers in the glass due to the irradiation. The EPR Hamiltonian parameters for these radicals were evaluated by simulation technique using Bruker SIMFONIA computer program. Glasses with varying iron content were irradiated with the same dose to evaluate the effect of iron content on the defect center concentration. A spin counting technique was employed to evaluate the number of defect centers produced in each glass. It was observed that the defect center concentration reduced as a function of increasing iron content. This was attributed to the charge trapping process of ferric ions in the amorphous system. *manojm@barc.gov.in

Investigation of Radiation Damage in Trombay Nuclear Waste Glasses by ESR and Photoluminescence Techniques

“…Similarly, the breaking of B-O-B bonds at regular sites leads to the formation of BOHC type of radicals in the system. Through the ESR data, the spin density of the radiation induced radicals was evaluated adopting standard procedure [Mohapatra et al (2013)] using a spin counting technique with suitable standard. In the present case, for the highest dose irradiated sample, the spin density was calculated to be 2.8 10 19 spins / 100 mg of the sample which is equivalent to few hundreds of ppm.…”

Glass resistance to radiation–part I: Preliminary investigation of three commercial glass fibers

“…Long‐term stabilities of the component mechanical properties and dimensionality are required to insure system operation performance under a long exposure of radiations. In the literatures, many studies have been reported covering radiation effects on properties of optical glasses 10−14 and nuclear waste glasses 15−17 . The studies concluded that various types of structural defects were generated in various types of glasses by radiation damages and in turn, adversely impact optical properties or chemical stability of the glasses resulted.…”

Radiation damage effects on the structure and properties of radioactive waste glasses

“…This primary interaction produces electron and hole pairs in the glass [37,45,56]. These mobile charge carriers can be trapped at different sites within the glass structure, forming radiation-induced paramagnetic defects [28,33,56,57]. These paramagnetic defects can be healed by allowing trapped charge carriers to recombine when external energy is supplied [31,57,58].…”

“…These mobile charge carriers can be trapped at different sites within the glass structure, forming radiation-induced paramagnetic defects [28,33,56,57]. These paramagnetic defects can be healed by allowing trapped charge carriers to recombine when external energy is supplied [31,57,58]. This energy can be supplied in the form of heat or by coulombic forces [31,57,58].…”

“…These paramagnetic defects can be healed by allowing trapped charge carriers to recombine when external energy is supplied [31,57,58]. This energy can be supplied in the form of heat or by coulombic forces [31,57,58]. Electrons can be trapped by multivalent cations such as transition metals and lanthanides which are present in HLW glasses and thus they may change their oxidation state [30,[59][60][61][62][63][64][65][66].…”