Thermoluminescent dosimeter  From Wikipedia, the free
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Jump to: navigation, search    The two most common types of TLDs
are calcium fluoride and lithium fluoride, with one or more
impurities to produce trap states for energetic electrons. The
former is used to record gamma exposure, the latter for gamma
and neutron exposure (indirectly, using the Li-6 (n,alpha)
nuclear reaction; for this reason, LiF dosimeters may be
enriched in lithium-6 to enhance this effect or enriched in
lithium-7 to reduce it). As the radiation interacts with the
crystal it causes electrons in the crystal's atoms to jump to
higher energy states, where they stay trapped due to
intentionally introduced impurities (usually manganese or
magnesium)[1] in the crystal, until heated. Heating the crystal
causes the electrons to drop back to their ground state,
releasing a photon of energy equal to the energy difference
between the trap state and the ground state. The electrons can
also