Post-annealing effects on EPR response of irradiated nano-structure hydroxyapatite

Dowlatshah, Fatemeh; Ziaie, Farhood; Hajiloo, N.; Amraie, R.; Fathollahi, Hadi

doi:10.1080/10420150.2012.696645

Cited by 8 publications

(3 citation statements)

References 10 publications

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Section: Introductionmentioning

confidence: 99%

“…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 .…”

mentioning

confidence: 99%

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

Taghipour

Zolfagharpour

Daneshvar³

et al. 2022

Luminescence

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In this research work, pure and doped hydroxyapatite samples were synthesized using hydrolysis and hydrothermal methods to produce powder material. The crystal structure was carried out by producing data using the X-ray diffraction system and the Rietveld method using material analysis using diffraction software. Then the sample was irradiated with different radiation absorbed doses, and their thermoluminescence response was investigated from the dosimetry point of view. The results showed that the synthesis method, doping, and annealing temperature could significantly affect the crystal structure and thermoluminescence dosimetry response of hydroxyapatite samples, consequently. The results showed that the high-temperature annealing process and dopant could lead to the formation of the β-TCP crystal phase during or after the synthesis of hydroxyapatite, and the percentage of this formed phase increased when raising the temperature, and finally led to increase in the thermoluminescence response.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Taghipour

Zolfagharpour

Daneshvar³

et al. 2022

Luminescence

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“…Because EPR dosimetry of tooth enamel exhibits a linear relationship between the EPR signal intensity and the irradiation dose, − ,, attempts have been made to develop the method for in vivo use. − Unfortunately, employing tooth enamel in this context faces major challenges because of factors that affect the quality of the enamel ,, and the dosimetry results because of additional overlapping EPR signals. ,, To circumvent the issues with biologically derived tooth enamel, synthetically-prepared carbonated hydroxyapatite (CHA) has been used to mimic the radiation response of tooth enamel. − Choice and control of the CHA synthesis method impacts the resultant material properties, offering a means to improve the carbonate-derived radical yield and homogeneity. Improvements in these two characteristics could increase CHA’s useful dynamic detection range and, thereby, its potential utility for EPR dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Electron Paramagnetic Resonance Characterization of Sodium- and Carbonate-Containing Hydroxyapatite Cement

et al. 2022

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Ionizing radiation-induced paramagnetic defects in calcified tissues like tooth enamel are indicators of irradiation dose. Hydroxyapatite (HA), the principal constituent in these materials, incorporates a variety of anions (CO 3 2− , F − , Cl − , and SiO 4 4−) and cations (Mn 2+ , Li + , Cu 2+ , Fe 3+ , Mg 2+ , and Na + ) that directly or indirectly contribute to the formation of stable paramagnetic centers upon irradiation. Here, we used an underexploited synthesis method based on the ambient temperature setting reaction of a self-hardening calcium phosphate cement (CPC) to create carbonate-containing hydroxyapatite (CHA) and investigate its paramagnetic properties following γ-irradiation. Powder X-ray diffraction and IR spectroscopic characterization of the hardened CHA samples indicate the formation of pure B-type CHA cement. CHA samples exposed to γ-radiation doses ranging from 1 Gy to 150 kGy exhibited an electron paramagnetic resonance (EPR) signal from an orthorhombic CO 2•− free radical. At γ-radiation doses from 30 to 150 kGy, a second signal emerged that is assigned to the CO 3•− free radical. We observed that the formation of this second species is dose-dependent, which provided a means to extend the useful dynamic range of irradiated CHA to doses >30 kGy. These results indicate that CHA synthesized via a CPC cement is a promising substrate for EPR-based dosimetry. Further studies on the CHA cement are underway to determine the suitability of these materials for a range of biological and industrial dosimetry applications.

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Influence of morphology and chemical processes on thermoluminescence response of irradiated nanostructured hydroxyapatite

Daneshvar

Shafaei

Manouchehri

et al. 2020

Journal of Luminescence

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Post-annealing effects on EPR response of irradiated nano-structure hydroxyapatite

Cited by 8 publications

References 10 publications

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

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

Electron Paramagnetic Resonance Characterization of Sodium- and Carbonate-Containing Hydroxyapatite Cement

Influence of morphology and chemical processes on thermoluminescence response of irradiated nanostructured hydroxyapatite

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