Premium
Synthesis and thermoluminescence characterizations of Sr 2 B 5 O 9 Cl:Dy 3+ phosphor for TL dosimetry
Author(s) -
Oza Abha H.,
Dhoble N. S.,
Park K.,
Dhoble S. J.
Publication year - 2015
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2818
Subject(s) - thermoluminescence , phosphor , photoluminescence , analytical chemistry (journal) , irradiation , strontium , activation energy , materials science , dosimetry , doping , thermoluminescent dosimeter , trapping , chemistry , luminescence , dosimeter , nuclear medicine , physics , optoelectronics , medicine , ecology , organic chemistry , chromatography , nuclear physics , biology
The photoluminescence (PL) and thermoluminescence (TL) displayed by Dy‐activated strontium haloborate (Sr 2 B 5 O 9 Cl) were studied. A modified solid‐state reaction was employed for the preparation of the phosphor. Photoluminescence spectra showed blue (484 nm) and yellow (575 nm) emissions due to incorporation of Dy 3+ into host matrix. The Dy‐doped (0.5 mol%) Sr 2 B 5 O 9 Cl was studied after exposure to γ‐irradiation and revealed a prominent glow curve at 261°C with a small hump around 143°C indicating that two types of traps were generated. The glow peak at the higher temperature side (261°C) was more stable than the lower temperature glow peak. The TL intensity was 1.17 times less than that of the standard CaSO 4 :Dy thermoluminescence dosimetry (TLD) phosphor, the phosphor showed a linear dose–response curve for different γ‐ray irradiation doses (0.002–1.25 Gy) and fading of 5–7% was observed for higher temperature peaks upon storage. Trapping parameters and their estimated error values have been calculated by Chen's peak shape method and by the initial rise method. Values of activation energies estimated by both these techniques were comparable. The slight difference in activation energy values calculated by Chen's peak shape method indicated the formation of two kinds of traps Furthermore, slight differences in frequency values are due to various escaping and retrapping probabilities. Copyright © 2014 John Wiley & Sons, Ltd.