Work

Application of gamma irradiation for the decontamination of historical glass plate photographic negatives

Year: 2026

Type: article

Abstract: 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.

Source: Journal of Radioanalytical and Nuclear Chemistry

DOI: 10.1007/s10967-026-10734-1

Authors: Maria Luiza E. Nagai, Elizabeth S. R. Somessari, Tatiana A. Reis, Pablo A. S. Vasquez

Institution: Instituto de Pesquisas Energéticas e Nucleares

Language: English

Topic: Cultural Heritage Materials Analysis

Subfield: Archeology

Field: Arts and Humanities

Domain: Social Sciences

Open Access status: hybrid

Estimated APC paid: $3,790

Funders: Universidade de São Paulo, Comissão Nacional de Energia Nuclear