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| Titel |
Real-time setup to measure radon emission during rock deformation: implications for geochemical surveillance |
| VerfasserIn |
P. Tuccimei, S. Mollo, M. Soligo, P. Scarlato, M. Castelluccio |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 4, no. 1 ; Nr. 4, no. 1 (2015-05-27), S.111-119 |
| Datensatznummer |
250115239
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| Publikation (Nr.) |
 copernicus.org/gi-4-111-2015.pdf |
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| Zusammenfassung |
| Laboratory experiments can represent a valid approach to unravel the complex
interplay between the geochemical behaviour of radon and rock deformation
mechanisms. In light of this, we present a new real-time experimental setup
for analysing in continuum the alpha-emitting 222Rn and 220Rn daughters over
variable stress–strain regimes. The most innovative segment of this setup
consists of the radon accumulation chamber obtained from a tough and durable
material that can host large cylindrical rock samples. The accumulation
chamber is connected, in a closed-loop configuration, to a gas-drying unit
and to a RAD7 radon monitor. A recirculating pump moves the gas from the
rock sample to a solid-state detector for alpha counting of radon and thoron
progeny. The measured radon signal is enhanced by surrounding the
accumulation chamber with a digitally controlled heating belt. As the
temperature is increased, the number of effective collisions of radon atoms
increases favouring the diffusion of radon through the material and reducing
the analytical uncertainty. The accumulation chamber containing the sample
is then placed into a uniaxial testing apparatus where the axial deformation
is measured throughout a linear variable displacement transducer. A
dedicated software allows obtaining a variety of stress–strain regimes from
fast deformation rates to long-term creep tests. Experiments conducted with
this new real-time setup have important ramifications for the interpretation
of geochemical anomalies recorded prior to volcanic eruptions or earthquakes. |
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