Retrospective dosimetry using synthesized nano-structure hydroxyapatite

Abstract

Micro and nano-structure hydroxyapatite samples were synthesized via several different methods. The samples were characterised utilising the Fourier transmission infra-red, scanning electron microscope and X-ray diffraction methods, to find out the structure most similar to human tooth enamel, and the best method was found. The electron paramagnetic resonance (EPR) signals of the gamma-irradiated samples were measured using an EPR spectrometer system. A calibration curve was established by irradiation of the samples at four doses of 50-500 mGy. The parameters of the calibration curve, slope and intercept with dose axis are determined by linear regression analysis. This calibration curve can be used for human tooth enamel for retrospective dosimetry purposes.

Thermoluminescence dose–response of synthesized and doped hydroxyapatite: effect of formed crystal phases

“…The chemical, structural, and morphological properties of synthetic HAP are sensitive to the preparation conditions, and these properties can be adjusted by changing the synthesis method. [ 28–38 ]…”

“…The chemical, structural, and morphological properties of synthetic HAP are sensitive to the preparation conditions, and these properties can be adjusted by changing the synthesis method. [28][29][30][31][32][33][34][35][36][37][38] HAP can exist in two crystal forms as hexagonal and monoclinic or a combination of both. The space group for the hexagonal structure of HAP is P6 3 /m, with the lattice parameters of a = b = 9.432 Å, c = 6.881 Å and the space group for the monoclinic structure of HAP is P2 1 /b, with the lattice parameters of a = 9.421 Å, b = 2a, c = 6.881 Å, and γ = 120 .…”

Thermoluminescence properties of gamma‐irradiated nano‐structure hydroxyapatite

“…Several articles have been published on the TL features of hydroxyapatite (HAP) [Ca 10 (PO 4 ) 3 (OH) 2 ] . HAP is the main mineral constituent of human bones and teeth, and can also be used in electron paramagnetic resonance (EPR) dosimetry . The space group and unit cell dimensions of HAP are: P6 3 /m and a = b = 9.432, c = 6.881, respectively .…”

Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

“…Dental biocompatible materials and their modifi cations were tested by the use of nuclear magnetic resonance (NMR) spectroscopy [1,2], Fourier-transform infrared (FTIR) [3,4], and electron microscopy [5,6]. Gamma irradiated dental materials were tested by electron paramagnetic resonance (EPR) method [7,8]. The nonirradiated exemplary synthetic and natural dental biocompatible materials applied in implanthology were examined by the use of EPR spectroscopy in this work.…”

“…Paramagnetic centers with unpaired electrons reveal high chemical activity in tissues [7][8][9][10][11][12][13]. Paramagnetic centers may change the properties of dental materials during storage, which is the Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials negative effect because the chemical structure of materials for stomatology should be stable.…”