Microstructural effects of gamma radiation from simulated radioactive borate liquid waste on hydrated cementitious composite

Iklaga, Gabriel Inalegwu and Kaposy, Nándor and Kovács, András and Hegedűs, M and Abudayeh, Ahmad and Kovácsné Kis, Viktória and Kovács, Zoltán and Orenibi, Esther Oluwabunmi and Maghsoudlou, Mona and Kashaija, Nedson and Salupeto-Dembo, J and Gméling, Katalin and Szabó, Csaba and Szabó-Krausz, Zsuzsanna and Völgyesi, Péter (2026) Microstructural effects of gamma radiation from simulated radioactive borate liquid waste on hydrated cementitious composite. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY- LETTERS. ISSN 0236-5731 (In Press)

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Abstract

The immobilization of radioactive liquid waste through cementitious encapsulation remains a cornerstone strategy in nuclear waste management. This study examines the microstructural impacts of increasing gamma irradiation doses on a PC-SAC-zeolite-bearing composite for boric acid RLW immobilization. The PC-SAC-zeolite-bearing composite specimens were exposed to varying doses of gamma radiation, i.e. to 10 Gy, 500 Gy, and 1000 Gy, respectively. After exposure to gamma radiation, the specimens were then studied using a combination of visual analyses using Stereo Microscopy and Scanning Electron Microscopy (SEM) and microstructural analyses using a combination of Transmission Electron Microscope (i.e. Bright-Field BF, Selected Area Electron Diffraction SAED, and Energy Dispersive Spectroscopy EDS), Fourier Transform Infrared Spectroscopy FTIR, and Raman Spectroscopy) analysis to investigate observable changes in the PC-SAC-zeolite-bearing composite specimens after exposure to gamma radiation. Visual alterations and changes in the microstructure of the specimen were observed at a gamma irradiation of 1000 Gy.

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