Jablonski Diagram

(1)

(2)

Basic Discrimination:

emission after excitation

For τ<10-8 _{s  fluorescence (spontaneous,}

T-independent)

For τ>10-8 _{s  phosphorescence (requires}

stimulation, T-dependent) Excitation = Irradiation

Stimulation = heating (TL), light (OSL)

(3)

trap

(4)

Energy band diagram

Ionisation Stimulation

Heat or light

Recombination

(5)

(6)

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0 100 200 300 400 0 200 400 600 800 1000 N o rm a li s e d T L Temperature (oC)

Examples of TL glow curves

0 100 200 300 400 500 0 200 400 600 800 1000 1200 T L (a .u ) Temperature (oC)

Initial part: Boltzmann factor Initial Rise Technique

(8)

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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0 100 200 300 400 0 200 400 600 800 1000 (3) (2) (1) N o rm a li s e d T L Temperature (oC)

Examples of TL glow curves

0 100 200 300 400 500 0 200 400 600 800 1000 1200 RTL TLf TLd (norm) T L (a .u ) Temperature (oC) TLi (II)