Luminescence characteristics of Li2O–MgO–B2O3 doped with Dy3+ as a solid TL detector. (November 2015)

• Record Type: Journal Article
• Authors: Hashim, S.; Mhareb, M.H.A.; Ghoshal, S.K.; Alajerami, Y.S.M.; Bradley, D.A.; Saripan, M.I.; Tamchek, N.; Alzimami, K.
• Is Part Of: Radiation physics and chemistry. Volume 116(2015:Nov.)
• Page Start: 138
• Page End: 141
• Publication Date: 2015-11
• Subjects: Borate glass -- Magnesium oxide -- Thermoluminescence -- Photoluminescence.; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2015.04.007
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: Enhancing the luminescence characteristics of rare earth doped borate glasses is the key issue in achieving an accurate dosimeter. Series of lithium and magnesium oxide modified borate glasses of compositions 20Li2 O–(70− x )B2 O3 –10MgO– x Dy2 O3, where 0.3≤ x ≤1 mol% are prepared using melt-quenching method. Synthesized samples are further activated with different concentration of Dy 3+ and subjected to different doses by using a 60 Co source. Effects of Dy 3+ concentrations on luminescence behavior are examined. XRD patterns confirm the amorphous nature of all samples. A simple glow curve exhibits a peak at 190 °C and optimum intensity for 0.5 mol% of Dy 3+ ions. Thermoluminescence (TL) properties including dose response and effective atomic number are determined. A good linearity in the dose response with correlation coefficient ~0.9977 and a tissue equivalent Z eff ~8.71 is achieved. The room temperature photoluminescence (PL) spectra of these glasses under 350 nm laser excitations reveal two enhanced peaks centered at 480 nm (blue) and 573 nm (yellow). The mechanism for the TL and PL enhancements are discussed and understood. These attractive luminescence features of prepared glasses may contribute towards the advancement of dosimetry. Highlights: A simple glow curve exhibits a peak at 190 °C and optimum intensity for 0.5 mol% of Dy 3+ ions A good linearity up to 4 Gy in the dose response with correlation coefficient ~0.9977 and a tissue equivalent Z eff ~8.71 is achieved. Two emission bands evidenced at 480 nm and 573 nm are assigned to 4 F9/3 → 4 H15/2 and 4 F9/2 → 4 H13/2 transitions, respectively.