Application of gamma irradiation for the decontamination of historical glass plate photographic negatives
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Journal of Radioanalytical and Nuclear Chemistry
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Ionizing radiation is an effective method for fungal decontamination of photographic heritage materials; however, its application to glass plate negatives may induce optical darkening due to radiation-induced defects in the glass matrix. This study investigates the influence of temperature during gamma irradiation and the potential of UVB light exposure as a non-thermal bleaching strategy. Historical glass plate negatives were irradiated at 6 kGy under room temperature and dry-ice cooling, while common soda–lime–silica glass samples were used as analogues to quantify optical changes. Low-temperature processing mitigated color alterations without affecting decontamination efficacy, whereas UVB exposure promoted partial recovery of transparency in a dose-dependent manner. The combined approach offers a viable strategy for balancing biocidal effectiveness and optical preservation in glass-based photographic heritage.
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NAGAI, MARIA L. E.; SOMESSARI, ELIZABETH S. R.; REIS, TATIANA A.; VASQUEZ, PABLO A. S. Application of gamma irradiation for the decontamination of historical glass plate photographic negatives. Journal of Radioanalytical and Nuclear Chemistry, v. 335, n. 2, p. 1215-1227, 2026. DOI: 10.1007/s10967-026-10734-1. Disponível em: https://repositorio.ipen.br/handle/123456789/49985. Acesso em: 25 Jun 2026.
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