NATURAL RADIOACTIVITY AND RADON RISK ASSESSMENT IN THE VULSINI VOLCANIC DISTRICT (CENTRAL ITALY)

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NATURAL RADIOACTIVITY AND RADON RISK ASSESSMENT IN THE VULSINI VOLCANIC DISTRICT (CENTRAL ITALY) Bruno Capaccioni, Giorgia Cinelli,, Domiziano Mostacci, Laura Tositti 4 Department of Earth and

1 NATURAL RADIOACTIVITY AND RADON RISK ASSESSMENT IN THE VULSINI VOLCANIC DISTRICT (CENTRAL ITALY) Bruno Capaccioni, Giorgia Cinelli,, Domiziano Mostacci, Laura Tositti 4 Department of Earth and Geological-Environmental Sciences, Bologna, Italy Protex Italia Spa, Forlì, Italy Laboratory of Nuclear Engineering, Bologna, Italy 4 Department of Chemistry «G. Ciamician», Bologna, Italy University of Bologna, Alma Mater Studiorum

2 Vulsini Volcanic District after Vezzoli et al, 987, modified

3 Vulsini Volcanic District after Vezzoli et al, 987, modified

4 Bolsena (VT)

5 Rock Sampling after Vezzoli et al, 987, modified)

6 Activity concentartion (Bq/kg) of natural radioisotopes by gamma-spectrometry, values of emanation power and Radioactivity Index 4 Bi Pb Ra Ac K REP U Th K (Bq/kg) (Bq/kg) (Bq/kg) (Bq/kg) (Bq/kg) ε (ppm) (ppm) (%) RI V4 Lat-A V7 Lat-A V8 Lat-A V Lat-C V5 Lat-D V6 Lat-D V Lat-E V Lat-E V9 Lat-F V Lat-F V4(z) Lat-F V Lat-Pit V(h) Lat-Pit V5 Bols V6(z) Bols V7 Bols V8 Bols V9 Bols V Bols V Bols V Lat Reguar soil a (Median) 8. Range a UNSCEAR ; (h) Hydrotermalizated; (z) Zeolitizatated

7 Consequences of high 6 Ra? Indoor Radon measurements

8 Site Building Type Floor Building Material Collected with continuous radon monitor: Femto-Tech Hotel Hostel + Plaster Public Building A House A + Plaster Public Building B + Plaster Church House + Plaster House B House C House D Collected with electrets E-Perm Public Building C House E House F Apartment G - Indoor Radon Activity(Bq/m)

9 Site Building Type Floor Building Material Collected with continuous radon monitor: Femto-Tech Hotel Hostel + Plaster Public Building A House A + Plaster Public Building B + Plaster Church House + Plaster House B House C House D Collected with electrets E-Perm Public Building C House E House F Apartment G - Indoor Radon Activity(Bq/m)

10 Site Building Type Floor Building Material Collected with continuous radon monitor: Femto-Tech Hotel Hostel + Plaster Public Building A House A + Plaster Public Building B + Plaster Church House + Plaster House B House C House D Collected with electrets E-Perm Public Building C House E House F Apartment G - Indoor Radon Activity(Bq/m)

11 Simulation of a standard room using RESRAD-BUILD code Main Parameters: Room width, length and height: 4, 5 and.8 m cm thick walls with a density of.5 g/cm.8 occupancy factor.5 air building exchange rate (/h) 5 Bq/kg 8 U Bq/kg Th 564 Bq/kg 4 K

12 Simulation of a standard room using RESRAD-BUILD code Bq/m Rn Main Parameters: Room width, length and height: 4, 5 and.8 m cm thick walls with a density of.5 g/cm.8 occupancy factor.5 air building exchange rate (/h) 5 Bq/kg 8 U Bq/kg Th 564 Bq/kg 4 K

13 after Renzulli 988, modified s the Soil contributor gas measurement of Soil Ra

14 Which is the Soil contributor gas measurement of Soil Radon Gas? after Renzulli 988, modified

15 Which is the Soil contributor gas measurement of Soil Radon Gas? after Renzulli 988, modified

16 Total Volcanic Products Alluvial Valid N Mean (kbq/m ) Median (kbq/m ) Minimum (kbq/m ) Maximum(kBq/m ) Quartile (kbq/m ) Quartile (kbq/m ) Std.Dev. (kbq/m ) Skewness Kurtosis p-value S-W test p-value t-test.8

Total Volcanic Products Alluvial Valid N 6 6 7 Mean (kbq/m ) 56. 66.9 4. Median (kbq/m ) 5.4 66. 6.9 Minimum (kbq/m ) 7. 9. 7. Maximum(kBq/m ) 76. 76. 9.9.Quartile (kbq/m ) 9.

17 Total Volcanic Products Alluvial Valid N Mean (kbq/m ) Median (kbq/m ) Minimum (kbq/m ) Maximum(kBq/m ) Quartile (kbq/m ) Quartile (kbq/m ) Std.Dev. (kbq/m ) Skewness Kurtosis p-value S-W test p-value t-test.8

18 Maps of percentage of high Radon Index Cells of. km Application of geostatistical techniques to calculate mean radon concentration threshold-cl was fixed at 7 kbq/m (for medium permabilty)

22 Conclusions This study focused on a specific little town, Bolsena, but the results apply similarly to almost every old village and town located in the northern part of Latium because the same volcanic rocks have been used widely as building material and the geological framework as well is the same Rocks sampled from the Latera and Bolsena complexes of the Vulsini Volcanic District show high contents of natural radionuclides and all with RI > High indoor radon concentrations were encountered in Bolsena, the Vulsini Volcanic District is undoubtedly a Radon-prone area. The indoor radon concentration estimated using a simulated standard room is lower than the what was measured, the code neglects the soil contribution, that in the area investigated appears extremely important The radon soil map shows a correspondence between lower radon and alluvial grounds and higher radon with volcanic grounds, respectively, reflecting the different NORM contents.

23 Conclusions This study focused on a specific little town, Bolsena, but the results apply similarly to almost every old village and town located in the northern part of Latium because the same volcanic rocks have been used widely as building material and the geological framework as well is the same Thank you Rocks sampled from the Latera and Bolsena complexes of the Vulsini Volcanic District show high contents of natural radionuclides and all with RI > for the attention! High indoor radon concentrations were encountered in Bolsena, the Vulsini Volcanic District is undoubtedly a Radon-prone area. The indoor radon concentration estimated using a simulated standard room is lower than the what was measured, the code neglects the soil contribution, that in the area investigated appears extremely important The radon soil map shows a correspondence between lower radon and alluvial grounds and higher radon with volcanic grounds, respectively, reflecting the different NORM contents.

The European Commission s science and knowledge service. Joint Research Centre

The European Commission s science and knowledge service Joint Research Centre Analysis of the European Atlas of Natural Radiation data within geological and soil units Giorgia Cinelli 1, Peter Bossew 2,