EPR study of radicals produced by Gamma-irradiation in marine mollusc (Venus sp.) fossils

R. Köseoǧlu; F. Köksal; E. Çiftçi

doi:10.1080/10420150412331296862

EPR study of radicals produced by Gamma-irradiation in marine mollusc (Venus sp.) fossils

R. Köseoǧlu^*, F. Köksal, E. Çiftçi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

In this study, gamma-irradiated marine mollusc (Venus sp.) fossils were investigated by electron paramagnetic resonance (EPR) at ambient temperature. Powder X-ray diffraction technique indicates that the Venus sp. fossils were made mainly of CaCO₃. Before γ -irradiation, the EPR lines of the powder of fossil samples showed the existence of Mn²⁺ (I = 5/2, 100% natural abundance) ions with g_av = 2.0055 and A_av = 9.4 mT. γ -Irradiation-induced additional defects in Venus sp. fossil were attributed to axial ĊO₃^- (g⊥ = 2.0171, g// = 2.0048), orthorhombic ĊO₂^- (g_x = 2.0030, g_z = 2.0018, g_y = 1.9973, g_av = 2.0007), freely rotating ĊO₂^- (g_iso = 2.0007), isotropic ṠO₂^- (g = 2.0057), axial ṠO₃ ^- (g⊥ = 2.0036, g // = 2.0024) and isotropic ṠO ₃^- (g = 2.0032) free radicals. The g-values of these free radicals were compared with the literature data belonging to similar defects.

Original language	English
Pages (from-to)	497-502
Number of pages	6
Journal	Radiation Effects and Defects in Solids
Volume	159
Issue number	8-9
DOIs	https://doi.org/10.1080/10420150412331296862
Publication status	Published - 2004
Externally published	Yes

Keywords

γ -irradiation
EPR
Fossil
Free radicals
Mollusc

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10.1080/10420150412331296862

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title = "EPR study of radicals produced by Gamma-irradiation in marine mollusc (Venus sp.) fossils",

abstract = "In this study, gamma-irradiated marine mollusc (Venus sp.) fossils were investigated by electron paramagnetic resonance (EPR) at ambient temperature. Powder X-ray diffraction technique indicates that the Venus sp. fossils were made mainly of CaCO3. Before γ -irradiation, the EPR lines of the powder of fossil samples showed the existence of Mn2+ (I = 5/2, 100% natural abundance) ions with gav = 2.0055 and Aav = 9.4 mT. γ -Irradiation-induced additional defects in Venus sp. fossil were attributed to axial ĊO3- (g⊥ = 2.0171, g// = 2.0048), orthorhombic ĊO2- (gx = 2.0030, gz = 2.0018, gy = 1.9973, gav = 2.0007), freely rotating ĊO2- (giso = 2.0007), isotropic ṠO2- (g = 2.0057), axial ṠO3 - (g⊥ = 2.0036, g // = 2.0024) and isotropic ṠO 3- (g = 2.0032) free radicals. The g-values of these free radicals were compared with the literature data belonging to similar defects.",

keywords = "γ -irradiation, EPR, Fossil, Free radicals, Mollusc",

author = "R. K{\"o}seoǧlu and F. K{\"o}ksal and E. {\c C}ift{\c c}i",

year = "2004",

doi = "10.1080/10420150412331296862",

language = "English",

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pages = "497--502",

journal = "Radiation Effects and Defects in Solids",

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T1 - EPR study of radicals produced by Gamma-irradiation in marine mollusc (Venus sp.) fossils

AU - Köseoǧlu, R.

AU - Köksal, F.

AU - Çiftçi, E.

PY - 2004

Y1 - 2004

N2 - In this study, gamma-irradiated marine mollusc (Venus sp.) fossils were investigated by electron paramagnetic resonance (EPR) at ambient temperature. Powder X-ray diffraction technique indicates that the Venus sp. fossils were made mainly of CaCO3. Before γ -irradiation, the EPR lines of the powder of fossil samples showed the existence of Mn2+ (I = 5/2, 100% natural abundance) ions with gav = 2.0055 and Aav = 9.4 mT. γ -Irradiation-induced additional defects in Venus sp. fossil were attributed to axial ĊO3- (g⊥ = 2.0171, g// = 2.0048), orthorhombic ĊO2- (gx = 2.0030, gz = 2.0018, gy = 1.9973, gav = 2.0007), freely rotating ĊO2- (giso = 2.0007), isotropic ṠO2- (g = 2.0057), axial ṠO3 - (g⊥ = 2.0036, g // = 2.0024) and isotropic ṠO 3- (g = 2.0032) free radicals. The g-values of these free radicals were compared with the literature data belonging to similar defects.

AB - In this study, gamma-irradiated marine mollusc (Venus sp.) fossils were investigated by electron paramagnetic resonance (EPR) at ambient temperature. Powder X-ray diffraction technique indicates that the Venus sp. fossils were made mainly of CaCO3. Before γ -irradiation, the EPR lines of the powder of fossil samples showed the existence of Mn2+ (I = 5/2, 100% natural abundance) ions with gav = 2.0055 and Aav = 9.4 mT. γ -Irradiation-induced additional defects in Venus sp. fossil were attributed to axial ĊO3- (g⊥ = 2.0171, g// = 2.0048), orthorhombic ĊO2- (gx = 2.0030, gz = 2.0018, gy = 1.9973, gav = 2.0007), freely rotating ĊO2- (giso = 2.0007), isotropic ṠO2- (g = 2.0057), axial ṠO3 - (g⊥ = 2.0036, g // = 2.0024) and isotropic ṠO 3- (g = 2.0032) free radicals. The g-values of these free radicals were compared with the literature data belonging to similar defects.

KW - γ -irradiation

KW - EPR

KW - Fossil

KW - Free radicals

KW - Mollusc

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IS - 8-9

ER -

EPR study of radicals produced by Gamma-irradiation in marine mollusc (Venus sp.) fossils

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