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Effects of cooling and heating rate on trapping parameters in LiF:Mg, Ti crystals

1992; Institute of Physics; Volume: 25; Issue: 8 Linguagem: Inglês

10.1088/0022-3727/25/8/016

1361-6463

A.J.J. Bos, R N M Vijverberg, T.M. Piters, S W S McKeeve,

Radiation Detection and Scintillator Technologies

The effects of the cooling rate alpha and heating rate beta on trapping parameters and thermoluminescent (TL) glow peak intensities in LiF:Mg, Ti(TLD-100) crystals have been studied by glow curve fitting from room temperature to 500 K. It is found that under the investigated circumstances (1 K min-1< alpha < 5000 K min-1, 0.12 K s-1 < beta FOM>0.2%). Glow peak intensities (peak area) for peaks 2,3,4 and 5 increase with both increasing cooling rate and heating rate in accordance with earlier investigations. However, the activation energies for most peaks vary strikingly with both cooling rate and heating rate: for peak 2 from 1.12 to 1.38 eV, for peak 3 from 1.06 to 1.43 eV, for peak 4 from 1.55 to 1.87 eV and for peak 5 from 1.73 to 2.08 eV. A qualitative explanation has been given in terms of clustering and precipitation of the defects responsible for TL during the annealing and readout stage.