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Increasing energy<br />

T<br />

CONDUCTION BAND<br />

T<br />

VALENCE BAND<br />

Figure 3.3. OSL processes represented by <strong>the</strong> conduction b<strong>and</strong> model. The mineral is exposed<br />

to nuclear radiation. The binding electrons are excited above <strong>the</strong>ir ground <strong>state</strong>s. As <strong>the</strong><br />

electrons return to <strong>the</strong>ir ground <strong>state</strong>s, some become trapped in defects in <strong>the</strong> crystal lattice<br />

(represented by “T”). When <strong>the</strong> mineral is exposed to light or heat <strong>the</strong> defects are emptied <strong>and</strong><br />

light is emitted. (Source: Aitken, 1991).<br />

48<br />

T

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