Механизмы термостимулированной люминесценции в УФ-облученных нанотрубках диоксида циркония

A nanotubular layer of zirconium dioxide was synthesized with anodic oxidation. Curves of spectrally resolved thermostimulated luminescence were studied in the 390-550 nm range after 300 nm UV irradiation. Energetic and kinetic parameters of thermostimulated luminescence curves were estimated. The mechanism of thermally-activated processes involving intrinsic lattice defects is proposed.

Ar divvērtīgā mangāna joniem aktivēta magnija germanāta materiāla ilgspīdošā luminiscence

In the course of study, 10 different MgGeO3:Mn2+ samples with different manganese 2+ ion concentrations were synthesized: 0 mol%, 0.1 mol%, 0.25 mol%, 0.5 mol%, 0.75 mol%, 1 mol%, 1.5 mol%, 2 mol%, 5 mol% and 10 mol%. The samples emit a good luminescence in the red spectrum diapason and can be excited by ultraviolet radiation and X-rays. Samples can shine for up to more than 10 hours after excitation. X-ray diffraction, excitation spectra, luminescence spectra, afterglow spectra, extinction kinetics and thermostimulated luminescence were measured for samples. The obtained results provide the basis for assessing the processes taking place in the materials and the effect that the concentration of admixture ions has on the luminescence. Perhaps in the future it will be possible to use magnesium germanate in medical diagnostic equipment, yielding a further improved insight into the human body. In this case, the results of the study will be useful for medical application.

About the Retrospective Dosimetry of Mixed Gamma-Neutron Radiation Fields

The article describes research on the development of a method for doses retrospective determination of gamma-neutron irradiation with separation into components has basing on thermostimulated luminescence of quartz. Confirmation of the hypothesis about the different course of dose responses from neutron radiation and gamma radiation under different conditions of building ceramics quartz’s thermal activation is given. The possibility of separation of luminescent signals in quartz caused by gamma radiation or neutron radiation is shown.

Usability of Cr-Doped Alumina in Dosimetry

Dosimetry is a widespread material science field dealing with detection and quantification of ionizing radiation using electronic processes in materials. One of the main aspects that determines the performance of dosimeters is the type of defects the material contains. Crystalline lattice imperfections are formed around impurity ions, which may have a smaller or larger size, or different oxidation states compared to host ions. In this study, we show what effects Cr impurities have on the luminescent properties of alumina. Porous Al 2 O 3 : Cr microceramics synthesized using the sol-gel method showed a higher thermoluminescence response than a single crystal ruby. We have found that Cr 2 O 3 concentration of 0.2 wt% was optimal; it yielded the highest X-ray luminescence and thermostimulated luminescence readout of all studied additive concentrations added to alumina during synthesis. Our results show that Cr doped alumina could potentially be used as a promising new material for dosimetry of ionizing radiation.