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Determination of 129I in environmental samples by neutron activation analysis
Krausová, Ivana ; Kučera, Jan ; Světlík, Ivo
A new RNAA method with pre-activation separation has been developed for determination of 129I and the ratio 129I/127I in environmental samples. Iodine is separated from samples prior to irradiation by combustion in oxygen stream and trapping in LIOH/(NH4)SO3 solution. Post-irradiation radiochemical separation of iodine consists in CHCl3 extraction of elemental iodine and PdI2 precipitation. The procedure has been verified by analysis of a reference seaweed sample Fucus serratus, and its basic metrological parameters were determined. The methods has been applied to analysis of aerosol filter, moss, lichen, sediment and bovine thyroide samples collected in the vicinity of the Temelín nuclear power plant.
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Recoveries of elements following fast decomposition of biological and other materials by alkaline-oxidative fusion
Kučera, Jan ; Krausová, Ivana
Recoveries of selected elements were studied for fast decomposition of biological and other materials using alkaline-oxidative fusion in a mixture of NaOH and Na2O2 at 850 to 900°C. The procedure yields total mineralization of samples within 2 to 3 minutes. It is therefore especially suitable in radiochemical activation analysis (RAA) for determination of elements forming short-lived radionuclides. Recoveries of the elements F, Si, S, Cl, Ti, V, Mn, Ge, As, Br, Mo, Ru, In, Sb, I, Re, Os, and U determined using radiotracers were in the range 95-100 %, while those for Se and Hg were significantly lower and highly variable.
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Vyhodnocení výsledků stanovení obsahů Hg, Zn, Co, Cr a Fe v humánním materiálu pomocí neutronové aktivační analýzy (NAA)
Zábranská, E. ; Rakovič, M. ; Foltýnová, V. ; Pilecká, N. ; Kučera, Jan ; Glagoličová, A. ; Výborný, S.
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