Multifrequency EPR study of carbonate- and sulfate-derived radicals produced by radiation in shells and corallite.
Shells of two sea mollusks (Venus sp.), pearl oyster (Meleagrina vulgaris) and corallite (white coral) were exposed to ionizing radiation (gamma and X rays) and then examined by EPR spectroscopy in X, Q and W band. The resulting spectra were analyzed and the g values of the EPR lines in the multicomponent spectra were determined. The increased resolution in Q- and W-band spectra allowed us to assign the observed lines to CO(2)(-) ion radicals (isotropic and orthorhombic), SO(2)(-) isotropic, SO(3)(-) (isotropic and axial), and Mn(2+) species. The assignments were confirmed by simulations of the spectra. Practical implications for the use of Q and/or W band in low-dose quantitative EPR measurements for dating and for accidental dose estimation are discussed.
Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.
G
G
Strzelczak
G
G
Vanhaelewyn
W
W
Stachowitz
E
E
Goovaerts
F
F
Callens
J
J
Michalik
D000818:Animals; D037421:Anthozoa / Q000528:radiation effects*; D002119:Calcium Carbonate / Q000528:radiation effects*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D008974:Mollusca / Q000528:radiation effects*; D010125:Ostreidae / Q000528:radiation effects*; D013431:Sulfates / Q000528:radiation effects*
D005609:Free Radicals; D013431:Sulfates; D002119:Calcium Carbonate