Energy Dependence of the CO33- Signal Intensity in ESR Dosimetry of Human Tooth Enamel.

The use of ESR spectroscopy for the investigation of dosimetric properties of egg shells

“…This shows that the material is energy dependent to some degree in the X-range. A similar tendency for energy dependence on human tooth enamel and annealed natural calcite samples was also observed by other authors (Iwasaki et al, 1991;Engin and G . uven, 2000).We calculated the effective atomic number (Z eff ) of the egg shell which was about 12.This value is higher than the value of the tissue (Z eff ¼ 7:4).…”

Spectral analysis of paramagnetic centers induced in human tooth enamel by x-rays and gamma radiation

“…For the same exposure dose, the intensity of the radiation signal induced by low-energy x-rays proves to be ~4-12 times greater than the amplitude of the signal induced by gamma radiation with energies more than an order of magnitude higher than the energy of the x-rays. A similar dependence of the yield of radiation-induced paramagnetic centers on the energy of the electromagnetic radiation was obtained in [6]. Some differences between the results of that paper and our work are due to the fact that the authors of [6] exposed the tooth enamel samples to x-rays and gamma radiation through a phantom made of a neutral material of different thickness, emphasizing meeting the condition of secondary electron equilibrium.…”

Exposure Dose Reconstruction from EPR Spectra of Tooth Enamel Exposed to the Combined Effect of X-rays and Gamma Radiation

“…This let us take into account the contribution of mechanically-induced paramagnetic centers to an accidental dose of gamma radiation for the population affected by the Chernobyl nuclear power plant disaster [9,12,13]. Secondly, for an identical applied exposure dose, the yield of paramagnetic centers in the tooth enamel when exposed to diagnostic x-rays is almost an order of magnitude higher than for gamma radiation [4][5][6]. Thirdly, there is the local nature of the effect of x-ray photons in dental procedures, in contrast to the whole-body nature of the accidental exposure.…”

“…At the same time, the energy of gamma photons from 137 Cs (the radioisotope making the major contribution to the effective external and internal exposure dose for the population in the case of nuclear power plant accidents) is more than an order of magnitude higher (662 keV). Nevertheless, for the same applied dose, the intensity of the EPR signal induced in tooth enamel by x-ray photons is an order of magnitude greater than the intensity of the signal induced by gamma radiation [4,5]. Such an effect leads to unequal overestimation of the dose load formed in tooth enamel by accidental external gamma radiation [5,6].…”