Gamma tomography of geological samples

Kód výsledku v 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>

Výsledek na webu

<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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Jazyk výsledku

angličtina

Název v původním jazyce

Gamma tomography of geological samples

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Gamma tomography of geological samples

Popis výsledku anglicky

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.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů