Thermoluminescent and dosimetric properties of anion-defective alpha-Al2O3 single crystals with filled deep traps.
Some new experimental results illustrating the effect of deep traps on luminescent and dosimetric properties of anion-defective single crystals of alpha-Al2O3 have been described. It was found that deep traps had an electronic origin. They were filled thanks to the photoionisation of F-centres and their filling was accompanied by the conversion of F-->F+ centres. The experiments revealed an interactive interaction of deep trapping centres. A model taking into account the thermal ionisation of excited states of F-centres was proposed. This model describes the trap filling process and mechanisms of the radio-, photo- and thermoluminescence, TSC and TSEE of the crystals under study. The sensitivity of TLD-500 detectors based on anion-defective alpha-Al2O3 equalised when deep trapping centres were filled.
Kortov
V S
VS
The Ural State Technical University, Department of Technical Physics, Ekaterinburg, Russia. kortov@ustu.ru
Milman
I I
II
Nikiforov
S V
SV
D000537:Aluminum Oxide / Q000737:chemistry / Q000528:radiation effects*; D000838:Anions; D003460:Crystallization; D008962:Models, Theoretical; D011854:Radiochemistry; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D013819:Thermoluminescent Dosimetry / Q000379:methods* / Q000706:statistics & numerical data
D000838:Anions; D000537:Aluminum Oxide