Reorientation of Eu-cation vacancy dipolar complex in KCl/KBr binary crystals.

In this work we describe the polarization and depolarization process of Eu-V dipoles in Eu doped solid solutions of KCl and KBr considering in detail the different jumping paths of the cation vacancy within individual arrangements of minority anions on the first two anion shells surrounding the dipolar complex. Experimental depolarization curves of binary crystals show in contrast to the single depolarization peak in unitary crystals, up to at least two additional depolarization peaks. These two additional peaks are associated with jumps perturbed by one, and two minority anions flanking the jumping path.

Dose dependences of radiation induced yield in mixed radiation fields.

A theoretical model that describes dose dependences of trap filling (radiation yield) in mixed radiation fields consisting of two components is proposed. The model consists of one type of electron traps and one type of hole traps and assumes as an initial step the creation of two types of tracks, each represented by some volume with a uniform electron-hole pair density, different for each track. The relaxation process that follows comprises interband recombination, trapping of electrons and holes, and recombination of electrons with trapped holes and of holes with trapped electrons.

Optical absorption, TL and IRSL of basic plagioclase megacrysts from the pinacate (Sonora, Mexico) quaternary alkalic volcanics.

The paper presents the first results of an investigation on optical absorption (OA), thermally and infrared stimulated luminescence (TL and IRSL) of the Pinacate plagioclase (labradorite). The OA spectra reveal two bands with maxima at 1.0 and 3.

Participation of Eu-aggregates in the photoluminescence, afterglow and thermoluminescence of UV-irradiated KCl:Eu at 20 K.

The participation of different aggregated phases of the Eu impurity in the afterglow (AG) and thermoluminescence (TL) of KCl:Eu after UV-irradiation at 20 K is investigated. Several aggregated phases of Eu are formed by applying different thermal treatments and their formation is monitored by photoluminescence. It is shown that the treatments leading to high concentration of aggregates result in much higher AG and TL yields than the treatments leading to high concentration of dipoles.

Thermoluminescence properties of KCl(1-X)KBrX:Pb2+ mixed crystals.

A study is presented of the thermoluminescence (TL) of phosphors based on potassium halides doped with divalent lead, such as KCl:Pb2+, KBr:Pb2+ and the crystalline series KCl(1-X)Br(X):Pb2+. The defects in the crystals generated by irradiation have been investigated as well as the trapping and room temperature recombination mechanisms. The samples were gamma irradiated to a dose of 10 kGy.