Abstract
We present an overview of the radon surveys at Stromboli island starting from the 2002, with the aim to better understand the relation between in-soil radon degassing and change in volcanic activity. Radon measurements were performed by means of different, passive, methodologies. By using a radon network of 21 sampling sites, placed in the NE sector of the island, we effected periodic surveys by means of two manually techniques. Track-etch detectors and EPERM electrets allowed us to construct a continuous time-series of radon measurements during the period 2002–2007 and to recognize the short-time variations. Radon activity shows, by means of EPERM ® electrets, a wide range of values, from 0.3 to 50 kBq/m 3 . These data confirm the role of the local effects on the in-soil radon emissions and show that the structural alignments represent a preferential pathways for the radon migration from soil to air. Prom the 2007 we developed two real-time multiparametric, fully automated stations where the measurements of radon activity, acquired every 15 minutes, are correlated with the soil temperature and atmospheric pressure data. The first results show the important role of the atmospheric factors ( e.g. soil temperature) in the acquired radon measurements.
Highlights
IntroductionRn-222 (in the following referred to as radon) is a radioactive noble gas generated from the decay of 226Ra, and belongs to the 238U decay chain
We present an overview of the radon surveys at Stromboli island starting from the 2002, with the aim to better understand the relation between in-soil radon degassing and change in volcanic activity
Track-etch detectors and EPERM electrets allowed us to construct a continuous time-series of radon measurements during the period 2002-2007 and to recognize the short-time variations
Summary
Rn-222 (in the following referred to as radon) is a radioactive noble gas generated from the decay of 226Ra, and belongs to the 238U decay chain. Radon measurements and their transport processes are largely employed and investigated because of their relevance in health physics and, in the geophysical field. Radon measurements can be helpful in several geological context (e.g. mines, geothermal area) and its continuous monitoring represents an important tool in order to track precursors in large sector of the natural risk mitigation. From this point of view, radon monitoring coupled with the measurement of atmospheric properties shows the major influence of the environmental parameters on the capability of radon to move towards the surface. We present a brief overview on the in-soil radon surveys performed at Stromboli island by our research group, starting from May 2002 using different methodologies
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