Abstract:
:Calcium fluoride CaF2 is an interesting host lattice for rare earth (RE) activators. CaF2 crystals doped with different concentrations of Dy, Ce, Er and Gd have been grown by the Bridgman technique and their deformation luminescence (DL) induced by room temperature gamma irradiation has been recorded. When a uniaxial pressure is applied on to gamma-irradiated CaF2:RE crystals, initially the DL intensity increases with time, attains a maximum value and then it decreases with time. Although the DL intensity produced during the release of pressure is less, its rise and decay behaviours are similar to that obtained during the application of pressure. The DL intensity depends on dopant, concentration of dopant, irradiation doses and mass of the load or applied pressure. It is suggested that the moving dislocation produced during deformation of crystals capture holes from hole trapped centres (like perturbed Vk centre) and the subsequent radiative recombination of the dislocation holes with electrons give rise to DL.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Kher RS,Brahme N,Banerjee M,Dhoble SJ,Khokhar MSdoi
10.1093/rpd/nci606subject
Has Abstractpub_date
2006-01-01 00:00:00pages
62-5issue
1-4eissn
0144-8420issn
1742-3406pii
nci606journal_volume
119pub_type
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