Filters
Results 1 - 1 of 1
Results 1 - 1 of 1.
Search took: 0.017 seconds
[en] With the exception of limited number of radionuclides that can be analysed directly by high resolution gamma spectrometry non-destructive radiochemical analysis is not possible. Chemical separation steps are required when detection by radiometry or mass spectrometry cannot be distinguished among various radioisotopes that are present simultaneously in sample. Determination of these radionuclides includes: determination of pure b-emitters and determination of a-emitters. In last decade for these determinations several procedures was developed and has been based on new extraction chromatographic resin and Sequential Injection Analysis (SIA). SIA belongs to a family of methods based on sample injection into a flowing stream, which carries the analyte through a chemical modulator into a detector. But in field of separation (modulator is separation column) SIA breaks the continuous forward paradigm of conventional chromatography by using programmed flow reversal. Eluents, samples and standards can all be nested around multiposition valve and sequentially selected for delivery to the column. For the determination of radioactive strontium by SIA Sr.spec resin column (prepared by adsorbing crown ether in 1-octanol onto non-ionic resin) is used. This resin selectively binds strontium from nitric acid solutions. SIA can be used for Pu, Am, U, Th and others nuclide determination but separation chemistry is more complicated. Separation is done on TRU (trans uranium) (and/or U/TEVA) resin column with several eluting solvents and on column redox reaction. Resins were prepared by impregnation of non-ionic resin with CMPO in tributylphosphate. These resins strongly bind trivalent, tetravalent and hexavalent actinides from nitric acid solutions. Tetravalent and hexavalent actinides but not trivalent actinides or lanthanides are extracted from hydrochloride acid solution. Americium and plutonium can therefore be separated from each other and from actinides if the speciation of plutonium is controlled through the multistep process. (author)
Source
Krajcar Bronic, I.; Miljanic, S.; Obelic, B. (eds.); Croatian Radiation Protection Association (Croatia); 407 p; ISBN 953-96133-4-5; 
; 2003; p. 284-289; 5. Symposium of the Croatian Radiation Protection Association; Peti simpozij Hrvatskog drustva za zastitu od zracenja; Stubicke Toplice (Croatia); 9-11 Apr 2003; 13 refs.
; 2003; p. 284-289; 5. Symposium of the Croatian Radiation Protection Association; Peti simpozij Hrvatskog drustva za zastitu od zracenja; Stubicke Toplice (Croatia); 9-11 Apr 2003; 13 refs.