Daniel Sas

Rapid dissolution of biological samples using microwave digestion for determination of radionuclide contamination by liquid scintillation

This paper describes a method for digestion of biological samples such as milk and milk products, paper filters, different seeds and meat. These samples were divided into common groups on the basis of close structure or properties. The evaluation of this method was conducted by automatic TDCR Liquid Scintillation Counter Hidex 300 SL. The alpha tracer 244Cm was used for the assessment of efficiency. The decomposition of samples was realized by MWS4 Speedwave (Berghof, Germany) with the method determined to be simple, safe and very effective as evidenced by high chemical yield.

The study of substitutability of liquid scintillation cocktail for YAP:Ce powder

The work deals with the possibility of replacement of traditional liquid scintillation cocktail by YAP:Ce powder. The basic scintillation parameters were investigated, such as geometry, efficiency and activity linearity dependences as well as auxiliary parameters like afterglow, temperature dependency and repeatability usage. All parameters were simultaneously measured using AquaLight scintillation cocktail as a standard used by the Army of the Czech Republic. Both outcomes were subsequently compared resulting in confirmation, that YAP:Ce powder is one of the possible substitutes.

Rapid determination of gross alpha and beta activity in seafood utilizing microwave digestion and liquid scintillation counting

This paper describes a method for rapid determination of gross alpha and beta activity in seafood using liquid scintillation counting and microwave digestion for fast sample decomposition. The general group of seafood was divided into two groups based on its structure, whether it has shell or not. The selected group of radionuclides was chosen with respect to military significance, radiotoxicity, and possibility of potential misuse. 90Sr and 239Pu were selected as model radionuclides.

Characterization of the extraction properties of the selected extraction sorbents TRU, TEVA, UTEVA and DIPHONIX

The paper describes the extraction characteristics of selected alpha radionuclides by means of extraction chromatography of the selected resins—TRU, TEVA, UTEVA, DN and DIPHONIX. The aim was to investigate the choice of mobile-phase and especially the effect on the percentage of extraction, the conditions leading to degradation of extraction sorbents and also to determine the synergistic effect of different cations added to mobile-phase.