## 5 Discussion  
This work shows the results obtained after a measurement survey was carried out in private homes located in some municipalities of the Sorrentina peninsula. The results presented in this work demonstrate the importance of dissemination as a useful process to increase people's awareness of the risks of radon exposure. The monitoring in residences occurred in this study after people were informed of the health dangers associated with exposure to high concentrations of radon, and urged to carry out the measures even if there was no requirement for monitoring in the home. According to the poll, many of those who requested radon testing at their houses were unaware of the dangers of radon.  
This study was conducted in a region in which an active volcano is located. Thus, the geology comprises extensive sections of pyroclastic rocks with a high radon concentration. The latter are frequently utilized as building materials, increasing the population's exposure to natural radiation. An example is tuff, which was frequently used in the construction of historic buildings in Campania [41]. In this regard, data preprocessing was performed by selecting, from the 100 monitored structures, only those built in concrete (70 dwellings), and taking advantage of the fact that these structures were numerically prevalent. As a result, the data were independent from the building material and a lower radon emission from the walls of buildings was ensured.  
Furthermore, the findings confirm the results of previous research, namely, that radon concentrations have a high dependence on the floor. This assertion can be determined from the value of the conversion factors and, as a result, from AM and GM, which were greater, in terms of the floor, after data normalization compared to non-normalized data (see Tables 1 and 2).  
The Legislative Decree 101 [9] establishes the value of 300 Bq/m\({}^{3}\) as the annual average radon concentration that should not be exceeded in all currently existing closed environments; this includes both workplaces and homes. For future buildings (built prior to 2024), the limit will be 200 Bq/m\({}^{3}\). In this study, only a small percentage (approximately 13%) of the data exceeded the limit of 300 Bq/m\({}^{3}\).  
Because the experimental data were normalized with respect to the building materials and the floor on which the measurement was performed, the dataset was independent of these building characteristics, and it is possible to hypothesize that radon concentrations are due to the geogenic potential of Rn in the observed area.  
Figure 7: Kriging map obtained with the Gini method for 70 measurement points on the Sorrentina peninsula.  
Although the map shows a cluster in the vicinity of the area between Sorrento and Massa Lubrense, a geological refinement and integration in the analysis of the geology of the area under study would allow any radon sources to be to classified.  
The map represents an estimate of the global distribution of Rn indoor concentrations. As a result of the lack of a comprehensive examination of the geological composition of the monitored region in this study, the area is likely to be classified incorrectly.  
Currently, our laboratory is conducting several measurement studies throughout the Campania region [42] that will add to the data presented in this study. This will allow the authors to perform a wider study that may encompass the entire Campania region. Indoor radon measurements and, hence, the development of interpolated maps using the Gini technique, will be accompanied by laboratory and/or in situ measurements of soil samples and/or substrate lithotypes to create geolithological maps. The creation of these maps will enable a study of the relationship between radon concentrations and the geology of the investigated area.