EPR dosimetric properties of nano-barium sulfate. (January 2015)

• Record Type: Journal Article
• Authors: Aboelezz, E.; Hassan, G.M.; Sharaf, M.A.; El-Khodary, A.
• Is Part Of: Radiation physics and chemistry. Volume 106(2015:Jan.)
• Page Start: 385
• Page End: 393
• Publication Date: 2015-01
• Subjects: Electron Paramagnetic Resonance -- BaSO4 -- Nanomaterials -- Radiation dosimetry -- Detection limit and Critical level; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2014.08.019
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: Nano/micro BaSO4 were prepared through the co-precipitation method to measure ionizing radiation doses using electron paramagnetic resonance (EPR). The nano-BaSO4 sample was characterized using X-ray diffraction (XRD), and transmission electron microscopy (TEM) techniques. The dose response and fading properties of nano- and micro-phase BaSO4 were compared in EPR spectra. The prepared nano- and micro-BaSO4 samples have the same hole and electron centers, which may be attributed to SO4 − and SO3 −, respectively. The dosimetric signals for prepared nano- and micro-BaSO4 have spectroscopic splitting factor ( g ) with values 2.0025±0.0006 and 2.0027±0.0006, respectively. The nanocrystalline sample has a linear γ-ray dose response over the range 0.4 Gy–1 kGy. The performance parameters which including detection limit and critical level calculated from weighted and unweighted least-squares fitting. The sensitivity of nano-BaSO4 to γ-ray is one and a half times more than alanine. The lifetime and activation energy for nano-BaSO4 were estimated by conducting a thermal stability study, and were 5.7±1.1×10 4 years and 0.73±0.14 eV, respectively. The combined and expanded uncertainties accompanying measurements were ±3.89% and ±7.78%, respectively. Highlights: Preparation of nano-BaSO4 using the co-precipitation method. Study of the dosimetric properties of nano-barium sulfate using the EPR technique. Comparison between a new EPR dosimeter using nano-materials and standard alanine. Calculation of the uncertainty budget for nano-BaSO4 .