2026-2027 / 3107
Thermo-luminescence dosimeter (TLD)
Fraction of absorbed energy is
stored in crystalline structure
“Forbidden gap”
Free electrons and holes are
formed and trapped at defects
in the crystalline structure.
Step 1: Irradiating
Meta-stable
states
radiation
When heated the electrons
return to the conduction band
while emitting energy
Step 2: Reading out
Some of this stores energy can
Be retrieved as visible light
300 C
heating