¹V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine,
45, prosp. Nauky, 03680 Kyiv, Ukraine
²National University “Kyiv-Mohyla Academy”, 2, Skovorody str., 04070 Kyiv, Ukraine
³Institute of Physics, National Academy of Sciences of Ukraine, 46, prosp. Nauky, 03680 Kyiv, Ukraine
⁴V. Vernadsky Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine,
32/34, Academician Palladin Ave., 03142 Kyiv, Ukraine
*Corresponding author e-mail: vvnosenko@ukr.net

Abstract. Amplification of a dosimetric EPR signal in mineralized biological materials available in limited quantities has been demonstrated in this paper. Powders of irradiated enamel, dentin, and bone tissue were placed into silica ampoules with the outer diameter close to 1.4 mm. To amplify the signal, the dielectric insert in the form of cylinder with the outer radius 2.85 mm, the inner radius 0.75 mm, and the height 1.85 mm made of a high-κ and low-loss ceramic material BaTi₄O₉ + 8.5% ZnO has been used. It has been shown that maximum signal amplification (about an order of magnitude) has been achieved when the sample is completely inserted into this dielectric. It has been found that the line shape of the dosimetric signal is not distorted, if using the dielectric insert. Decomposition of the amplified EPR spectra allowed us to determine the relative contribution of two types of CO₂^– radicals to the dosimetric signal, which coincides with the literature data.

Keywords: EPR, paramagnetic defect; bioapatite; dielectric insert.

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