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Radiation Protection Dosimetry Advance Access originally published online on April 27, 2006
Radiation Protection Dosimetry 2006 119(1-4):66-70; doi:10.1093/rpd/nci607
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Correlation between thermoluminescence and mechanoluminescence of gamma–irradiated Dy activated potassium and magnesium mixed sulphate

R. S. Kher1,*, A. K. Panigrahi1, S. J. Dhoble2 and M. S. K. Khokhar3

1 Department of Physics, Government Science P. G. College, Bilaspur 495 006, India
2 Department of Physics, Kamala Nehru College, Sakkaradara, Nagpur 440 009, India
3 Department of Rural Technology, Guru Ghasidas University, Bilaspur 495 009, India

* Corresponding author: kherrs{at}hotmail.com

Thermoluminescene (TL) and mechanoluminescence (ML) properties of gamma-irradiated Dy activated potassium and magnesium mixed sulphate have been studied. (K2Mg2:Dy) (SO4)3 samples having different concentrations of Dy were prepared by solid-state diffusion method. Two distinct peaks, the first ~130°C and the second ~273°C, are observed in the TL glow curve. It is also observed that TL intensities of both peaks decrease when TL glow curves were recorded after deforming the irradiated samples. Only one peak is observed in the ML intensity vs. time curve and the ML intensity decreases markedly with the post-irradiation annealing (to remove 130°C TL peak) of the sample. Both ML and TL intensities have been observed optimum for 1 mol% of Dy in the mixed sulphate system. It is suggested that the recombination of electrons with the free radicals (anion radicals produced by gamma irradiation) released from the traps during the thermal or mechanical excitation is responsible for luminescence in this system.


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