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| Titel |
Muon tomography in the Mont Terri underground rock laboratory |
| VerfasserIn |
N. Lesparre, D. Gibert, J. Marteau, B. Carlus, C. Nussbaum |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061166
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| Zusammenfassung |
| The Mont Terri underground rock laboratory (Switzerland) was excavated in a Mesozoic
shale formation constituted by Opalinus clay. This impermeable formation presents suitable
properties for hosting repository sites of radioactive waste.
A muon telescope has been placed in this laboratory in October 2009 to establish the
feasibility of the muon tomography and to test the sensor performance in a calm environment,
where we are protected from atmospheric noisy particles. However, the presence of radon
in the gallery as well as charged particles issued from the decay of gamma rays
may create a background noise. This noise shift and smooths the signal inducing
an under estimation of the rock density. The uncorrelated background has been
measured by placing the planes of detection in anti-coincidence. This estimation is
preponderant and has to be combined to the theoretical feasibility evaluation to
determine the best experimental set-up to observe muon flux fluctuations due to density
variations.
The muon densitometry experience is here exposed with the estimation of its feasibility. The
data acquired from different locations inside the underground laboratory are presented. They
are compared to two models representing the layer above the laboratory corresponding to a
minimum and a maximum muon flux expectation depending on the values of the rock density. |
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