Gamma radiation effects on physical properties of parchment documents: Assessment of Dmax |
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| Authors: | Inês Nunes Nuno Mesquita Sandra Cabo Verde Maria João Trigo Armando Ferreira Maria Manuela Carolino António Portugal Maria Luísa Botelho |
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| Institution: | 1. Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, Apartado 21, 2686-953 Sacavém, Portugal;2. Center for Functional Ecology, Department of Life Sciences, Faculty of Sciences and Technology, University of Coimbra, 3001-401 Coimbra, Portugal;3. Instituto Nacional dos Recursos Biológicos, L-INIA, Quinta do Marquês, 2784-505 Oeiras, Portugal;4. Center for Environmental Biology (CBA), Department of Plant Biology, Faculty of Sciences, University of Lisbon, 1149-016 Lisbon, Portugal;1. Emergency Department, Hospital Clínic, “Emergency Care: Processes and Pathologies” Research Group, IDIBAPS, Barcelona, Spain;2. Department of Infectious Diseases, Hospital Clínic, IDIBAPS, University of Barcelona, Spain;3. Department of Microbiology, Hospital Clínic, Barcelona Centre for International Health Research (CRESIB, Hospital Clínic – University of Barcelona), Spain;1. Medical University of South Carolina, Charleston, South Carolina;2. Mount Sinai School of Medicine, New York, New York;3. Cleveland Clinic, Weston, Florida;4. Columbia University, New York, New York;5. Society of Thoracic Surgeons, Chicago, Illinois;6. University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin;7. 21st Century Oncology/Michigan Healthcare Professionals, Farmington Hills, Michigan;8. Beth Israel Deaconess Medical Center, Boston, Massachusetts;9. Society of Nuclear Medicine, Reston, VA;10. Memorial Sloan-Kettering Cancer Center, New York, New York;11. New York Methodist Hospital, Brooklyn, New York;12. American College of Chest Physicians, Glenview, Illinois;13. University of Florida College of Medicine, Gainesville, Florida;1. University Space Research Association, Columbia, MD 21044, USA;2. University of Michigan, Applied Physics, Ann Arbor, MI 48109, USA;3. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA |
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| Abstract: | Parchments are important documents that give testimony for History; therefore these materials should be respected and preserved. Considering incremental biodeterioration problems that have to be faced daily, the Archive of the University of Coimbra (AUC) is involved in different scientific projects in order to evaluate and determine new methods for document decontamination and preservation.The aim of this study was to evaluate gamma radiation effects on the colour and texture of the AUC parchment documents. The assessment of these effects was used to estimate the maximum gamma radiation dose (Dmax) that could guarantee parchment documents′ decontamination treatment, without significant alteration of their physical properties. Parchment samples were exposed to gamma radiation doses ranging from 10 to 30 kGy. The texture and colour of samples were assessed before and after the irradiation procedure, using a texture analyser and an electronic colorimeter. Hardness and springiness were determined based on texture spectra. Lightness (L?), Chroma (C), greenness vs. redness (a*) and yellowness vs. blueness (b*) values were obtained from colorimetric measures. Results indicate no significant effects of gamma radiation on the texture and colour of parchment for the studied doses. |
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