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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Retrospective dosimetry using synthesized nano-structure hydroxyapatite.

F Ziaie1, N Hajiloo, A Alipour

  • 1Agricultural, Medical and Industrial Research School, Nuclear Science and Technology Research Institute, PO Box 31485-498, Karaj, Iran. fziaie@nrcam.org

Radiation Protection Dosimetry
|December 7, 2010
PubMed
Summary

Researchers synthesized hydroxyapatite structures similar to human enamel. Electron paramagnetic resonance (EPR) of gamma-irradiated samples created a calibration curve for retrospective dosimetry in human teeth.

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Area of Science:

  • Biomaterials Science
  • Dosimetry
  • Materials Science

Background:

  • Hydroxyapatite is a key component of human tooth enamel.
  • Accurate retrospective dosimetry is crucial for assessing radiation exposure.
  • Developing reliable methods for enamel analysis is an ongoing challenge.

Purpose of the Study:

  • To synthesize micro- and nano-structured hydroxyapatite with properties mimicking human tooth enamel.
  • To establish a reliable method for retrospective dosimetry using electron paramagnetic resonance (EPR) on hydroxyapatite.
  • To determine the optimal synthesis method for hydroxyapatite intended for dosimetry applications.

Main Methods:

  • Synthesis of hydroxyapatite via multiple methods.
  • Characterization using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD).

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  • Electron paramagnetic resonance (EPR) spectroscopy of gamma-irradiated samples to establish a dose-response calibration curve (50-500 mGy) using linear regression analysis.

    • Main Results:

    • Identification of the optimal hydroxyapatite synthesis method yielding structures similar to human enamel.
    • Successful establishment of a calibration curve correlating EPR signal intensity with gamma radiation dose.
    • Determination of calibration curve parameters (slope and intercept) via linear regression.

    Conclusions:

    • The optimized synthesis method produces hydroxyapatite suitable for dosimetry applications.
    • The established EPR-based calibration curve is applicable for retrospective dosimetry in human tooth enamel.
    • This approach offers a promising tool for assessing past radiation exposure.