<abstract xmlns="http://www.w3.org/1999/xhtml">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.</abstract>

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.

Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C

Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland, Tel.: +48 22 504 1236

Institute of Ceramics and Building Materials, 9 sPostępu Str., 02-676 Warsaw, Poland

Nukleonika

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with C

In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3− (orthorhombic...

Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with ¹³C

Published Online: Aug 06, 2015

Page range: 429 - 434

Received: Oct 13, 2014

Accepted: Jan 30, 2015

DOI: https://doi.org/10.1515/nuka-2015-0076

Keywords
aragonite, calcite, dosimetry, EPR spectroscopy, γ-irradiation, radicals

© Jarosław Sadło et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C

Published Online: Aug 06, 2015

Page range: 429 - 434

Received: Oct 13, 2014

Accepted: Jan 30, 2015

DOI: https://doi.org/10.1515/nuka-2015-0076

Keywordsaragonite, calcite, dosimetry, EPR spectroscopy, γ-irradiation, radicals

© Jarosław Sadło et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with ¹³C

Keywords
aragonite, calcite, dosimetry, EPR spectroscopy, γ-irradiation, radicals