A new ESR dosimeter based on bioglass material

• Published in: Radiation measurements Vol. 38; no. 3; pp. 311 - 315
• Main Authors: Hassan, Gamal M., Sharaf, M.A., Desouky, Omar S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-06-2004; Elsevier
• Subjects: Bio-G; Biocompatible Materials - radiation effects; Bone Cements - radiation effects; Ceramics - radiation effects; Cobalt Radioisotopes; Dose-Response Relationship, Radiation; Dosimetry; Earth sciences; Earth, ocean, space; Electron Spin Resonance Spectroscopy; ESR; Exact sciences and technology; Gamma Rays; Geochronology; Isotope geochemistry. Geochronology; Kinetics; Radiation; Radiation Dosage; Bio-G; Dosimetry; ESR; Radiation; efficiency; gamma rays; ferric iron; impurities; irradiation; electron paramagnetic resonance; Co-60; activation energy; stability
• ISSN: 1350-4487; 1879-0925
• DOI: 10.1016/j.radmeas.2004.01.020

Bioglass (Bio-G) samples were irradiated with
60
Co
γ
-rays to study radicals for dosimetric materials with electron spin resonance (ESR). The ESR spectrum of Bio-G is characterized by two main signals. The first signal at
g≅4.3 corresponds to Fe
3+ impurities and the second signal at
g≅2.0130 with line-width
10.85
G
is ascribed as a hole center. The
γ-ray dose response and thermal stability were studied to establish the suitability of Bio-G as an ESR dosimeter. A radical formation efficiency,
G-value, of 0.53±0.11 was obtained. The lifetime of radicals and the activation energy were estimated from Arrhenius plots to be approximately 255±46 days and
0.71
eV
, respectively.