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A new ESR dosimeter based on bioglass material.
Gamal M Hassan1, M A Sharaf, Omar S Desouky
1Department of Ionizing Radiation Metrology, National Institute for Standards (NIS), Cairo, Egypt. gamalhassan65@hotmail.com
Radiation Measurements
|April 29, 2005
Summary
Bioglass shows potential as an electron spin resonance (ESR) dosimeter. Irradiated bioglass exhibits stable radical signals suitable for measuring gamma-ray doses.
Area of Science:
- Materials Science
- Radiation Physics
- Analytical Chemistry
Background:
- Bioglass (Bio-G) is investigated for its potential application in radiation dosimetry.
- Electron Spin Resonance (ESR) is a sensitive technique for detecting radical species.
Purpose of the Study:
- To evaluate bioglass as a material for electron spin resonance (ESR) dosimetry.
- To characterize the ESR signals and radiation response of gamma-ray irradiated bioglass.
Main Methods:
- Bioglass samples were irradiated using 60Co gamma-rays.
- Electron Spin Resonance (ESR) spectroscopy was employed to analyze radical formation.
- Dose response, thermal stability, and radical lifetime were assessed.
Main Results:
- ESR spectra revealed signals attributed to Fe3+ impurities and a hole center.
- A radical formation efficiency (G-value) of 0.53 ± 0.11 was determined.
- Radical lifetime and activation energy were estimated at approximately 255 days and 0.71 eV, respectively.
Conclusions:
- Bioglass demonstrates suitability as an ESR dosimeter due to its dose response and radical stability.
- The characterized radical properties support its use in radiation measurement applications.