A simple approach to determine the diffusivity of americium in granite
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Lai-Wu Song
Abstract
The diffusivities of the key radionuclides in host rock are important for the performance assessment of repositories. One of the conventional methods for determining the diffusivities of radionuclides is to grind the rock tablet layer by layer and then to measure the radioactivity remaining on the rock tablet before each grinding cycle. Since grinding hard rock samples, especially those with radioactivity, is very difficult, we developed a new approach to determine the diffusivity of americium in granite. The new approach mainly includes two parts: one is to measure the radioactivities from both sides of a rock disk sample by autoradiography with phosphor imaging technique; the other is to study the relationship between the radioactivities and the apparent diffusivity of americium in granite by computer modelling. Because the high contamination risk of grinding radioactive rock samples has been avoided, the new approach is much simpler than the conventional method. It may be a better choice of measuring the diffusivities of radionuclides in rock, especially for those laboratories in which grinding radioactive rock samples is inconvenient.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Artikel in diesem Heft
- New cross section measurements for production of the positron emitters 75Br and 76Br via intermediate energy proton induced reactions
- Production of 48V in a nuclear reactor via secondary tritons
- Formation of Cm humate complexes in aqueous solution at pHc 3 to 5.5: The role of fast interchange
- Coprecipitation of 137Cs and 85Sr microquantities with complex compound [M(18-crown-6)]BPh4 (M=Na+, Cs+) from neutral and alkaline solutions
- Role of diluent on the extraction and transport of strontium using 4,4′(5′)di-tert-butyl-dicyclohexano-18-crown-6 (DTBCH18C6) as the extractant
- UC oxidation with HNO2 in aqueous solutions of HNO3 and HClO4
- A simple approach to determine the diffusivity of americium in granite
- Synthesis and crystal structures of new complexes of Np(V) glycolate with 2,2′-bipyridine, [NpO2(C10H8N2)(OOC2H2OH)]·1.5H2O and [NpO2(C10H8N2)(OOC2H2OH)]·2.5H2O
- Am and Eu extraction from acidic media by synergistic mixtures of substituted bis-tetrazolyl pyridines with chlorinated cobalt dicarbollide
