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This paper focuses on the investigation of the usefulness of measuring soil radon as a trace gas in the search of earthquake precursors. A multilevel approach was followed: (a) Detailed preparatory experimentation. (b) Set-up of methods and devices. (c) Active and passive radon measurements during a very active tectonic period in Peloponnese (Greece) on 2008. This period was combined with the occurrence of two very destructive earthquakes. (d) Detailed discussion and analysis of significant collected radon signals that included two very strong radon anomalies prior to the 8/6/2008 M=6.5 earthquake which occurred 29 km from the measuring site. The two detected strong radon disturbances could be possibly related only to the 8/6/2008 earthquake. (e) Discussion on the interpretation of the detected radon anomalies. The recent (2008) asperity model is proposed as a possible explanation of these anomalies. The paper concluded that the strong radon disturbances may be linked to strong earthquakes.