Callegari, Ivan and Bezzon, Gian Pietro and Broggini, Carlo and Buso, Giampaolo and Caciolli, Antonio and Carmignani, Luigi and Colonna, Tommaso and Fiorentini, Giovanni and Guastaldi, Enrico and Kaçeli Xhixha, Merita and Mantovani, Fabio and Massa, Giovanni and Menegazzo, Roberto and Mou, Liliana and Pirro, Altair and Rossi Alvarez, Carlos and Strati, Virginia and Xhixha, Gerti and Zanon, Alessandro (2013) Total natural radioactivity, Tuscany, Italy. Journal of Maps, Vol. 9 (3), p. 438-443. eISSN 1744-5647. Article.
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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 40K, 238U and 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 km2. 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.
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