We present the first detailed map of the terrestrial natural radioactivity of the Veneto Region\ud (Italy), a 18,264 km2 densely populated area, previously investigated through indoor radon\ud surveys. The activity concentration in 709 representative samples of the main Alpine\ud lithostratigraphic units was measured by using a high-purity germanium (HPGe) g-ray\ud spectrometer to characterize the radioactivity content of the 41 cartographic units of the\ud Veneto Lithostratigraphic map at 1:250,000 scale. An area accounting for 61% of the\ud territory, comprising alluvial plains was investigated through airborne g-ray measurements.\ud The large-volume NaI detectors were mounted on an ultralight aircraft, flying a 7000 km\ud line. The data were interpolated using Ordinary Kriging, and a distribution model of the\ud radioactivity content was produced. The result of the data analysis is a total natural\ud radioactivity map of Veneto at 1:250,000 scale in which the activity concentration of the\ud territory is visualized in seven classes, according to the percentile values calculated on the\ud total dataset of measurements
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