Correlation between thermoluminescence and mechanoluminescence of gamma-irradiated Dy activated potassium and magnesium mixed sulphate.
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 approximately 130 degrees C and the second approximately 273 degrees 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 degrees 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.
Kher
R S
RS
Department of Physics, Government Science P. G. College, Bilaspur 495 006, India. kherrs@hotmail.com
Panigrahi
A K
AK
Dhoble
S J
SJ
Khokhar
M S K
MS
D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005720:Gamma Rays; D008278:Magnesium Sulfate / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D019563:Mechanics; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013431:Sulfates / Q000737:chemistry* / Q000528:radiation effects*; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods
D013431:Sulfates; C031512:potassium sulfate; D008278:Magnesium Sulfate