Abstract

LiF TLD-100 exposed to 25.8 C kg-1 and then annealed at 350 degrees C for 15 minutes contains defects responsible for the 225 nm optical absorption band and peak XII. Other defects have not been identified in this sample. Consequently, phototransfer thermoluminescence (PTTL) has been assumed to originate from peak XII. Results are presented that show that PTTL is not as simple a process as the transfer of charges from peak XII traps to the traps corresponding to peaks at lower temperatures. The mechanism is much more involved and the defects responsible for absorption at 225 nm play only a catalytic role in PTTL.

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