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AREZZO
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Canale Maestro della Chiana
TOTAL NATURAL RADIOACTIVITY MAP OF TUSCANY (ITALY)
CARTOGRAPHIC REFERENCE SYSTEM ED50 UTM ZONE 32 - CARTESIAN LATTICE IN BLACKGEOGRAPHIC COORDINATES REFER TO THE ED50 GEODETIC SYSTEM IN BLUE
Franc
e
SwitzerlandAustria
CroatiaSlovenia
Bosnia& Herz.
Tunisia
Hungary
Mediterranean Sea
Adriatic Sea
TirrhenianSea
Ionian
Sea
I t a l y
TuscanyRegion
Germany
Callegari I.a, Bezzon G. P.b, Broggini C.c, Buso G. P.b, Caciolli A.c, Carmignani L.a, Colonna T.a, Fiorentini G.b,d,e, Guastaldi E.a, Kaçeli Xhixha M.f, Mantovani F.d,e, Massa G.a, Menegazzo R.c,
Mou L.b, Pirro A.a, Rossi Alvarez C.c, Strati V.b,d, Xhixha G.d,e,g, Zanon A.ba University of Siena, Center for GeoTechnologies, Via Vetri Vecchi, 34 - 52027 San Giovanni Valdarno, Arezzo, Italy.b Istituto Nazionale di Fisica Nucleare (INFN), Legnaro National Laboratory, Via dell’Università, 2 - 35020 Legnaro, Padova, Italy.c Istituto Nazionale di Fisica Nucleare (INFN), Padova Section, Via Marzolo 8 - 35131 Padova, Italy. d University of Ferrara, Physics and Earth Science Department, Via Saragat, 1 - 44100 Ferrara, Italy.e Istituto Nazionale di Fisica Nucleare (INFN), Ferrara Section, Via Saragat, 1 - 44100 Ferrara, Italy.f University of Sassari, Botanical, Ecological and Geological Sciences Department, Piazza Università 21- 07100 Sassari, Italy.g Agricultural University of Tirana, Faculty of Forestry Science, Kodër Kamëz - 1029 Tirana, Albania.
The total area of 22.994 km of Tuscany Region (Italy) was investigated for the characterization of natural radioactivityby collecting 865 rock samples. The sampling was guided by criteria closely related to the reference geological information (geological map of Tuscany at scale 1:250.000). Except for alluvial deposits, the samples come from fresh outcrops of rock, selected in order to characterize the composite lithologies of the geological groups. In particular,attention was paid that the sampling would allow a coherent statistical coverage of the 45 geological groups. We have collected in average at least one sample for 80 km , with an overall average of one sample each 25 km .By using a geographical information system (GIS), we performed a re-classification of the geological groups based on their radiometric response. For building the map of the total activity we analyzed the distributions of K, U and Th for each geological group. We rejected 28 records which are found to be outliers (i.e. exceeding the median ± 1.5 Inter Quartile Range) of the box-plot representations. After this analysis, we calculate the median and 1σ uncertainty of the total activity, referred to each geological groups. We realized the classification of each geological group through the median total activity. In order to avoid arbitrary classes and any distribution of input records, we chose the percentiles which are simply based on order statistics to represent the total activity map. We identified 7 classes of total activity choosing 10%, 30%, 50%, 70%, 85% and 100% percentiles, almost evenly spread across the range of values. In order to emphasize the "high" values we added an additional class of total activity chosen at 95% percentile.
Descrittive notes2
22
40 232238
0 5 10 15 20 25 302.5km
Scale 1:300000
© Journal of Map, 2013
Total Radioactivity (Bq/kg)Percentile95-10085-9570-8550-7030-5010-300-10
1643-3761886-1643712-886553-712259-55352-2597-52
Legend
! ! ! Border of Tuscany Region
LakeRiverGeological Formations limits
Town!( Rock sample
Lago Trasimeno
Lago di Bilancino
Lagunadi Orbetello