The shape of TL glow curves

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The shape of TL glow curves

All naturally occurring TL phosphors exhibit complex TL glow curves, consisting of several prominent (easy to identify) as well as a number of hidden (shoulder) TL peaks.

Only few specific artificially produced TL dosimeters yield single TL glow curves consisting of only one, unique TL peak.

Each glow peak in the TL glow curve corresponds to one single TL trap.

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Energy band diagram

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Experimental TL glow curves

 Experimental parameters 1. T_max (o_C) 2. Heating Rate β (o_C/sec)  Dependent Variables 1. T_peak (o_C) 2. I_peak (a.u.) 0 100 200 300 400 500 0 5000 10000 15000 20000 25000 30000 (d) (c) (b) TL (a. u. ) Temperature (C) (a) τ₁ τ₂ τ₃ τ4

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A1 Nepal B2 India Kilkis  Greece Koupa  Greece S1  Nigeria S2  Turkey Un-fired

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A1 Nepal B2 India Kilkis  Greece Koupa  Greece S1  Nigeria S2  Turkey Fired

(Polymeris et al., NIM B 274, 105 – 110, 2012)

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0 100 200 300 400 500 102 103 104 105 106 (c) (d) (e) (g) (h) (f) (b)  - in d u ced T L (a. u .)  - in d u ced T L (a. u .) Temperature (oC)  (a) 0 100 200 300 400 500 102 103 104 

Quantifying luminescence

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0 100 200 300 400 500 0 1000 2000 3000 4000 5000 6000 P re d o s e T L ( a .u .) Temperature (oC)

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110 oC

220 oC275

o_C

325 o_C–