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Radiation Protection Dosimetry 101:503-506 (2002)
© 2002 Oxford University Press

Electron Paramagnetic Resonance of Human Tooth Enamel at High Gamma Ray Doses

G. Liidja and A. Wieser

Powdered human tooth enamel was exposed to 60Co gamma rays up to a dose of 100 kGy. The electron paramagnetic resonance (EPR) signal intensity (I) of the radiation-generated carbon dioxide radicals was measured for dependence on absorbed dose (D). The EPR dose response can be fitted with an exponential saturation function I = IM[1-exp(-D/D37)] with the saturated signal intensity (IM) and the dose saturation value (D37). The obtained value D37 = 9.64 (± 0.96) kGy (measured at least one month after irradiation) exceeds those given in the literature. The saturated concentration of orthorhombic CO2- radicals was estimated at 6.5 x 1017 per gram of enamel by comparing the integrated EPR spectra of enamel and a standard MgO:Cr probe. For enamel samples, which were heated before irradiation for one hour at +405 oC, the value of D37T = 3.89 (± 0.44) kGy and the saturated value of CO2- radicals 3.4 x 1017 per gram of enamel were lower than for unheated samples. The initial rise of the signal with the dose was slightly higher (8.8 x 1013 radicals/g x Gy) for heated compared with unheated samples (6.8 x 1013 radicals/g x Gy).


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