Total natural radioactivity, Tuscany, Italy

Ivan Callegari, Gian Pietro Bezzon, Carlo Broggini, Gian Paolo Buso, Antonio Caciolli, Luigi Carmignani, Tommaso Colonna, Giovanni Fiorentini, Enrico Guastaldi, Merita Kaçeli Xhixha, Fabio Mantovani, Giovanni Massa, Roberto Menegazzo, Liliana Mou, Altair Pirro, Carlos Rossi Alvarez, Virginia Strati, Gerti Xhixha and Alessandro Zanon

Journal of Maps, 2013, vol. 9, issue 3, 438-443

Abstract: In this paper, we report an extensive survey of the natural radioactive content of rocks of the Tuscany Region (Italy): this permitted the first total natural radioactivity map of the region. The sampling was planned using the geological map of Tuscany at scale 1:250,000, which contains 45 distinct geological groups recognized by tectonic and stratigraphic features. Each geological group was characterized for the total activity by measuring the activity concentrations of -super-40K, -super-238U and -super-232Th in 865 samples using a high-purity germanium (HPGe) gamma-ray spectrometer. The average areal distribution of samples is approximately one sample per 25 km-super-2. The radiometric map was constructed through the reclassification of each geological formation based on the median value of the total activity. Seven classes of total activity are identified by choosing percentiles almost evenly spread across the range of values. This map represents the starting point for future studies on natural background radiation, geochemical processes and epidemiological investigations.

Date: 2013
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DOI: 10.1080/17445647.2013.802999

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