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Authors: Giammanco, S.*
Immè, G.*
Mangano, G.*
Morelli, D.*
Neri, M.*
Title: Comparison between different methodologies for detecting Radon in soil along an active fault: the case of the Pernicana fault system, Mt. Etna (Italy)
Title of journal: Applied Radiation and Isotopes
Series/Report no.: /(2008)
Publisher: Elsevier
Issue Date: 2008
DOI: 10.1016/j.apradiso.2008.09.007
Keywords: Soil Radon and Thoron activity
soil CO2 efflux
Pernicana fault system
Mount Etna
volcano-tectonic monitoring
Abstract: Three different methodologies were used to measure Radon (222Rn) in soil, based on both passive and active detection system. The first technique consisted of Solid State Nuclear Track Detectors (SSNTD), CR-39 type, and allowed integrated measurements. The second one consisted of a portable device for short time measurements. The last consisted of a continuous measurement device for extended monitoring, placed in selected sites. Soil 222Rn activity was measured together with soil Thoron (220Rn) and soil carbon dioxide (CO2) efflux, and it was compared with the content of radionuclides in the rocks. Two different soil gas horizontal transects were investigated across the Pernicana fault system (NE flank of Mount Etna), from November 2006 to April 2007. The results obtained with the three methodologies are in a general agreement with each other and reflect the tectonic settings of the investigated study area. The lowest 222Rn values were recorded just on the fault plane, and relatively higher values were recorded a few tens of meters from the fault axis on both of its sides. This pattern could be explained as a dilution effect resulting from high rates of soil CO2 efflux. Time variations of 222Rn activity were mostly linked to atmospheric influences, whereas no significant correlation with the volcanic activity was observed. In order to further investigate regional radon distributions, spot measurements were made to identify sites having high Rn emissions that could subsequently be monitored for temporal radon variations.. SSNTD measurements allow for extended-duration monitoring of a relatively large number of sites, although with some loss of temporal resolution due to their long integration time. Continuous monitoring probes are optimal for detailed time monitoring, but because of their expense, they can best be used to complement the information acquired with SSNTD in a network of monitored sites.
Appears in Collections:Papers Published / Papers in press
03.04.07. Radioactivity and isotopes
03.04.08. Instruments and techniques
04.01.99. General or miscellaneous
04.02.01. Geochemical exploration
04.02.05. Downhole, radioactivity, remote sensing, and other methods
04.04.99. General or miscellaneous
04.04.06. Rheology, friction, and structure of fault zones
04.04.09. Structural geology
04.06.99. General or miscellaneous
04.07.99. General or miscellaneous
04.07.07. Tectonics
04.08.99. General or miscellaneous
04.08.06. Volcano monitoring
04.08.07. Instruments and techniques

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