Electron paramagnetic resonance of human tooth enamel at high gamma ray doses

G. Liidja, A. Wieser, Y. S. Horowitz, L. Oster

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Powdered human tooth enamel was exposed to 60Co γ 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 × 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°C, the value of D37T = 3.89 (± 0.44) kGy and the saturated value of CO2- radicals 3.4 × 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 × 1013 radicals/g × Gy) for heated compared with unheated samples (6.8 × 1013 radicals/g × Gy).

Original languageEnglish
Pages (from-to)503-506
Number of pages4
JournalRadiation Protection Dosimetry
Issue number1-4
StatePublished - 1 Jan 2002

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging


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