EGU2020-22687
https://doi.org/10.5194/egusphere-egu2020-22687
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Extending the concept of background to soil gas: natural radon concentrations in soils of Campania region.

Stefano Albanese1, Annalise Guarino1, Daniela Zuzolo2, Antonio Aruta1, Domenico Cicchella2, Antonio Iannone2, Raffaele Melito2, Francesco Verrilli2, and Alessandro Fedele Gianvito2
Stefano Albanese et al.
  • 1Dipartimento di Scienze della Terra, Ambiente e Risorse (DiSTAR), Università degli Studi di Napoli Federico II, Napoli, Italy (stefano.albanese@unina.it)
  • 2Dipartimento di Scienze e Tecnologie (DST), Università degli Studi del Sannio, Benevento, Italy

Radon is an ubiquitous radioactive gas proceeding from the decay of some radionuclides, mostly abundant in igneous rock and volcanic soils; it is the main source of natural radiation to which human beings are exposed during their life. Campania, a region located on the south-western sector of the Italian peninsula, has a territory mostly characterized by the presence of volcanic lithotypes and sediments. 
An empirical method was applied to determine the concentration of Rn-222 in soils of Campania region by using radiometric  and compositional data recorded in two extensive different environmental prospecting campaigns completed in 2003 and 2015, respectively.

Radiometric surveys were carried out with a nominal density of 1 station per 5 sqkm with a GRS-500 portable scintillometer produced by Scintrex Ltd (Ontario, Canada); topsoil samples were collected at 3535 sites regularly spread across the whole regional area with a nominal density of 1 sample per sqkm. Samples destinated to chemical analyses were analysed by ICP-MS after an aqua regia digestion at the ACME Analytical Laboratories Ltd (now Bureau Veritas) in Vancouver, Canada.  

Specifically, the concentrations of  U, Th and K  in topsoil samples  and the activity (gamma radiation) generated by the decay of U-238, Th-232 and K-40 (expressed as Bq) at  each measurement station were used as proxies in order to determine the variation of Rn-222 flux from the ground and to estimate the distribution pattern of geogenic radon potential (GPR) across the region.

The use of a sequence of specific equations led to estimate the terrestrial gamma dose rate (nSv/h) at 1 m above the ground surface starting from both datasets and, therefore, allowed the generation of the Rn-222 flux and GPR maps for the whole regional territory.

Both Radon flux and GPR raster maps were produced by mean of some specific geospatial elaborations and the estimated values were compared among them and validated trough the completion of some field measurements.

How to cite: Albanese, S., Guarino, A., Zuzolo, D., Aruta, A., Cicchella, D., Iannone, A., Melito, R., Verrilli, F., and Gianvito, A. F.: Extending the concept of background to soil gas: natural radon concentrations in soils of Campania region., EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-22687, https://doi.org/10.5194/egusphere-egu2020-22687, 2020

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