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Electron Spin Resonance and Thermoluminescence for Assesment of Color Changes in Irradiated Nacres

Pucić, Irina; Marusic, Katarina; Knežević, Željka; Maltar-Strmečki, Nadica Electron Spin Resonance and Thermoluminescence for Assesment of Color Changes in Irradiated Nacres. In: 13th Tihany Symposium on Radiation Chemistry (29 August 2015 - 3 September 2015) Balatonalmadi, Hungary. (Unpublished)

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Abstract

Radiation treatment is an advantageous method of biodecontamination of cultural heritage (CH) objects [1]. Its possible side effects need to be assessed for any material that may be included. Nacre or mother-of-pearl is a common ornament material in CH objects and it often cannot be removed prior to radiation treatment. Nacre is a natural biocomposite composed of calcium carbonate in crystalline form of aragonite embedded in a protein matrix. Proton induced X-ray emission (PIXE) was used to determine composition and concentration of trace elements present in nacre. Some radiation induced color changes of selected irradiated nacre samples were detected by color assessment in CIELAB space and by UV-VIS reflectance. The goal of this research was to identify the nature of color centers formed upon irradiation of nacres and to determine the cause of difference in changes between the nacres. The color centers formed are assumed to arise of electronic excited states, various species containing unpaired electrons and free radicals so the electron spin resonance (ESR) and the thermoluminscence (TL) methods were used.

Item Type: Unpublished conference/workshop items or lecture materials
Uncontrolled Keywords: nacre; gamma irradiation; EPR; Thermoluminescence; color
Subjects: NATURAL SCIENCES
NATURAL SCIENCES > Physics
NATURAL SCIENCES > Chemistry
FIELD OF ART
FIELD OF ART > Interdisciplinary Fields of Art
INTERDISCIPLINARY AREAS OF KNOWLEDGE
Divisions: Division of Materials Chemistry
Division of Materials Physics
Depositing User: Katarina Marušić
Date Deposited: 30 Aug 2018 11:58
Last Modified: 30 Aug 2018 11:58
URI: http://fulir.irb.hr/id/eprint/4158

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