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The research and development of new VUV scintillators includes also LuLiF4 single crystals doped by \Nd^3+. Due to their lower light yield, the \Gd^3+ codoping is studied as a tool to improve an energy transfer from the host to \Nd^3+ emission centers and increase the light yield consequently. Emission spectra and decays with respect to the different concentration of Gd and Nd ions are studied and discussed as well. [ABSTRACT FROM PUBLISHER]

Abstract: An overview of absorption and luminescence characteristics of Nd3+ and Gd3+ centers in a LiLuF4 single crystal host is provided. Single crystals doped with the above rare earth ions were prepared by micro-pulling-down technique in the form of rods a few cm long with a diameter of about 2mm. Excitation and emission spectra and fast decay kinetics in VUV and UV spectral regions were measured at room temperature. The observed absorption and emission peaks are due to the 5d–4f and 4f–4f optical transitions of Nd3+ and Gd3+ centers. Concentration dependence of the decay kinetics is also discussed. [Copyright &y& Elsevier]

Abstract: An overlook of absorption and luminescence characteristics of Nd3+, Er3+ and Tm3+ centers in LiLuF4 single crystal is provided. Single crystal doped with the mentioned RE ions were prepared by micro-pulling-down technique in the form of few cm long rods with the diameter of about 2 mm. Excitation and emission spectra and fast decay kinetics in VUV spectral region were measured at SUPERLUMI station at synchrotron DESY, Hamburg and characterization was further completed in UV-visible region at conventional spectrophotometers. Observed absorption and emission peaks are ascribed to the 5d–4f and 4f–4f optical transitions in the doped rare earth ions. Concentration dependence of the decay kinetics is discussed. [Copyright &y& Elsevier]

Individual monitoring services for external radiation were tested in the Czech Republic. The results of the tests show that they are dosimetry systems authorized and regularly tested in the Czech Republic having outliers for low energy region and angle of 50 degree and greater. With the highest probability, it can be stated that the processing equipment does not determine the angle of exposure reliably. These cases may have caused overestimations of Hp(10) in the special conditions occurring e.g. in interventional radiology and cardiology procedures. [ABSTRACT FROM AUTHOR]