TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Raj S. S., Mishra D. R., Soni A., Grover V., Polymeris G. S., Muthe K. P., ...More

RADIATION PHYSICS AND CHEMISTRY, vol.127, pp.78-84, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 127
  • Publication Date: 2016
  • Doi Number: 10.1016/j.radphyschem.2016.06.007
  • Journal Name: RADIATION PHYSICS AND CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.78-84
  • Keywords: OSL, TL, XRD, MgA(2)O(4): C, Photo-ionization cross-section, Dosimetry, OPTICALLY STIMULATED LUMINESCENCE, CURVE DECONVOLUTION, SPINEL CRYSTALS, THERMOLUMINESCENCE, ALPHA-AL2O3-C, PHOSPHOR, TL/OSL
  • Ankara University Affiliated: Yes

Abstract

The MgAl2O4:C has been synthesized by using two different methods by electron gun and vacuum assisted melting of MgAl2O4 in presence of graphite. The MgAl2O4:C phosphor thus developed by these two different methods have similar types of the TL/OSL defects with multiple overlapping TL glow peaks from 100 C to 400 C. The Computerized Curve De-convolution Analysis (CCDA) has been used to measure TL parameters such as thermal trap depth, frequency factor and order of kinetic associated with charge transfer process in TL phenomenon. The investigated TL/OSL results show that these two methods of incorporating carbon in MgAl2O4 have generated closely resemble the defects of similar types in MgAl2O4:C lattice. However, the MgAl2O4:C synthesized by electron gun shows relatively larger concentration of the TL/OSL defects as compared to MgAl2O4:C synthesized using vacuum assisted melting method. The photo-ionization cross-section (PIC) associated with fastest OSL component of MgAl2O4: C is found to be similar to 0.5 times than that of fastest OSL component of commercially available dosimetric grade alpha-Al2O3:C. The MgAl2O4:C thus developed shows good dynamic OSL dose linearity from few mGy to 1 Gy. This work reveals that MgAl2O4:C could be developed as potential tissue equivalent OSL / TL material. (C) 2016 Elsevier Ltd. All rights reserved.