Gamma tomography of geological samples
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000215" target="_blank" >RIV/26722445:_____/20:N0000215 - isvavai.cz</a>
Result on the web
<a href="https://www.rap-conference.org/20/RAP_2020_Book_of_Abstracts.pdf" target="_blank" >https://www.rap-conference.org/20/RAP_2020_Book_of_Abstracts.pdf</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Gamma tomography of geological samples
Original language description
The study of intergranular permeability of granite for the purpose of assessing the safety of the deep deposition of radioactive waste into geological formations enables the characterization of migration processes taking place in the rock environment. Cylindrical samples with a diameter of 50 mm and a height of 10 mm are obtained from deep well boreholes in the monitored locality. During the so-called diffusion experiment, the sample is placed between two reservoirs, where the inlet tank contains a radioactive tracer (eg 134CsCl, 137CsCl, etc.), the output reservoir is inactive (so-called diffusion cell). The sample is exposed to this solution for several weeks to months. The results were evaluated based on Fick's law. After removal of the samples from the diffusion cell, they were cut to 1 mm slices by diamond saw, in the past. Each slice was then individually studied by autoradiography. The new gamma tomography device SPE-CT, constructed by experts from the Research Center Rez, now allows analysed the sample tomographically, i.e. by a non-destructive method, and display the radioactivity inside the sample in 3D distribution. The resulting map of 3D distribution of radioactivity can be used to determine the permeability of the sample for water labelled with a suitable radioactive salt. The 3D analysis of the spatial distribution of indicator activity in a geological sample shows the propagation of the indicator along with defects in granite, intergranular permeability of intact granite, etc. Presented at International Conference on Radiation Applications (RAP 2020), virtual conference.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
20701 - Environmental and geological engineering, geotechnics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů