Comparison of the TL fading characteristics of Ge-doped optical fibres and LiF dosimeters

Fading is important in choosing appropriate thermoluminescence (TL) materials for particular applications. Comparison is made herein of changes due to fading in the TL yield of Ge-doped fibres and lithium fluoride (LiF) dosimeters, for varying temperature and dose. The fading is independent of dose for all investigated dosimeters while the loss in TL yield reduces for lower storage temperatures. At room temperature and for 133 days of storage, a maximum signal loss of 5% has been observed for both forms of LiF dosimeter, while 9 and 50 μm core diameter Ge-doped fibres produced a loss of 11% and 8%, respectively.

► Fading in the Ge-doped fibres and lithium fluoride (LiF) dosimeters were investigated.
► Examination has been made of changes in TL yield, for varying temperature and dose.
► The fading is independent of dose, whereas dependent on storage temperatures.
► At room temperature and for 133 days of storage, LiF dosimeters produce the fading, at 5%.
► While, 9 and 50 μm core diameter fibres produced a loss of 11% and 8%, respectively.