A low temperature study of the glow peaks of LiF TLD-100 single crystals after alpha irradiation

Abstract

In addition to 5 well known glow peaks between room temperature (RT) and 500 K, 8 glow peaks are observed between liquid nitrogen temperature (LNT) and room temperature (RT) after alpha irradiation of LiF TLD-100 single crystal. Intensity of the glow peak observed at 131 K is about 120 times higher than that of dosimetry peak 5 (481 K).

Activation energyE was determined for glow peaks of 131 K, 144 K and 256 K using (i) Initial rise and (ii) Peak shape methods. The average values of trapping parametersE and s are 0.36 eV and 4.4 × 10¹² sec -1; 0.3 2 eV and 7.0 × 10⁹ sec -1; 0.74 eV and 1013 sec -1 for these glow peaks respectively.

Key Words:

• Keywords:
• thermoluminescence
• glow curve
• trapping parameters
• activation energy
• frequency factor.