|
|
Highly luminescent nanophosphors - new physics, technologies and applications
Nikl, Martin ; Čuba, V. ; Bárta, J. ; Jarý, Vítězslav
The application of radiation synthesis in the manufacturing nanopowders of binary and ternary oxide nanophosphors is reviewed. Technological routes are described: irradiation of specific solutions containing soluble metal salts and OH radical scavenger by UV or ionizing radiation results in the formation of finely dispersed solid phase which is separated from the solution and subsequently converted by further thermal treatment into crystalline nanopowders with typical dimension of grains of several tens of nanometers. Doped ZnO, Y2O3, Y3Al5O12, Lu3Al5O12 and Gd3(Ga,Al)5O12 nanophosphors were prepared and their luminescence and scintillation characteristics were measured. In the photoluminescence decay of doped garnets the distinct effect of nanosized grains was found consisting in the slowing-down of the decay due to the change of effective refractive index.
|
|
|
Energy loss in the conductive layer on single crystal scintillator surface
Flodrová, E. ; Neděla, Vilém
This work deals with study of mechanisms of loosing signal electron energy in the single crystal scintillator which depend on the type and thickness of the conductive layer on the surface. The types and amount of loss processes will he described. Monte Carlo simulations were performed for quantification of energy loss for individual processes and materials which are commonly used in scintillations detection systems.
|
|
| |
|
|
Optická část mnohakanálového energiového analyzátoru elektronů
Čižmár, Petr
Our version of the multichannel energy analyzer consists of two main parts. At first it is an electron optical part, which separates the entering electrons by their energy. Then the electrons land onto a scintillating screen. Secondly there is the optical part, which should project the light signal on the scintillator onto a detecting CCD. There are several ways how to do this
|
|
| |
|
|
Optimalizace podmínek hydratace v ESEM
Autrata, Rudolf ; Neděla, Vilém
Study of biological specimens of soft tissues with fine and very fine hydrated structure still remains a big problem because this structure can be easily damaged by dehydration during the initiating phase of vacuum pumping of a microscope. The attention is thus focused on setting up the conditions for complete dehydration of samples, ensuring the nature state of a sample during the critical phase of pumping of a microscope
|
guest ::
