In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3− (orthorhombic symmetry, bulk and bonded to surface), CO33−, NO32−, O3−, and in aragonite CO2− (isotropic and orthorhombic symmetry) depending on the type of calcium carbonate used. For calcium carbonates enriched with 13C more detailed information about the formed radicals was possible to be obtained. In both natural (white coral) and synthetic aragonite the same radicals were identified with main differences in the properties of CO2− radicals. An application of Q-band EPR allowed to avoid the signals overlap giving the characteristics of radical anisotropy.
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1. Ikeya M. (Ed.) (1993). Application of electron spin resonance – dating dosimetry and microscopy (Chapter 5). Singapore: World Scientific.
2. Weihe H. Piligkos S. Barra A. L. Laursen I. & Johnsen O. (2009). EPR of Mn2+ impurities in calcite: a detailed study pertinent to marble provenance determination. Archaeometry51 43–48.
3. Callens F. Vanhaelewyn G. Matthys P. & Boesman E. (1998). EPR of carbonate derived radicals: Applications in dosimetry dating and detection of irradiated food. Appl. Magn. Reson.14 235–254.
4. Jacobs C. De Canniere P. Debuyst R. Dejehet F. & Apers D. (1989). ESR study of gamma-ray irradiated synthetic calcium carbonates. Appl. Radiat. Isot. 40 1147–1152.
5. Katzanberger O. Debuyst R. De Canniere P. Dejehet F. Apers D. & Barabas M. (1989). Temperature experiments on Mollusc samples: an approach to ESR signal identification. Appl. Radiat. Isot. 40 1113–1118.
6. Stachowicz W. Burlinska G. & Michalik J. (1993). Applications of EPR spectroscopy to radiation treated materials in medicine dosimetry and agriculture. Appl. Radiat. Isot. 44 423–427.
7. Stachowicz W. Michalik J. Burlinska G. Sadlo J. Dziedzic-Goclawska A. & Ostrowski K. (1995). Detection limits of absorbed dose of ionizing radiation in molluskan shells as determined by EPR spectroscopy. Appl. Radiat. Isot. 46 1047–1052.
8. Stachowicz W. Sadlo J. Strzelczak G. Michalik J. Bandiera P. Mazzarello V. Montella A. Wojtowicz A. Kaminski A. & Ostrowski K. (1999). Dating of paleoanthropological nuragic skeletal tissues using electron paramagnetic resonance (EPR) spectrometry. Int. J. Anat. Embryol. 109 19–31.
9. Bhatti I. A. Akram K. & Kwon J.-H. (2012). An investigation into gamma-ray treatment of shellfish using electron paramagnetic resonance spectroscopy. J. Sci. Food Agric. 92 759–763.
10. Strzelczak G. Vanhaelewyn G. Stachowicz W. Goovaerts E. Callens F. & Michalik J. (2001). Multifrequency EPR study of carbonate and sulfate-derived radicals produced by radiation in shells and corallite. Radiat. Res. 155 619–624.
11. Wencka M. Lijewski S. & Hoffmann S. K. (2008). Dynamics of CO2− radiation defects in natural calcite studied by ESR electron spin echo and electron spin relaxation. J. Phys.-Condens. Matter20 255237(10pp.).
12. Jaegermann Z. Michałowski S. Karaś J. & Polesiński Z. (2002). Preparation of synthetic biomaterials based on calcium carbonate. Szkło i Ceramika 4 3–9 (in Polish).
13. Bogushevich S. E. & Ugolev I. I. (2005). Stabilization of ion-radicals in the structure of calcium sulfite. J. Appl. Spectr. 72 419–425.
14. Debuyst R. Dejehet F. & Idrissi S. (1993). Isotropic CO3− and CO2− radicals in γ-irradiated monohydrocalcite. Radiat. Prot. Dosim. 47 659–664.
15. DeCanniere P. Debuyst R. Dejeht F. & Apers D. (1988). ESR study of internally α-irradiated (210Po nitrate doped) calcite single crystal. Nucl. Tracks14 267–273.