title: Radiological characterization of the ancient Roman tuff-pozzolana underground quarry in Orvieto (Italy): A natural laboratory to revisit the interactions between radionuclides and aerosols.
abstract: Orvieto (Italy) has a large network of underground tunnels quarried to extract tuff and pozzolana by Etruscans and Romans. One of these tunnels was chosen as natural laboratory to compare different radiation measurement and dose assessment methods. Indeed, tuff and pozzolana are very rich in natural radioactivity and are interesting from the radiation protection point of view since they are still used as building materials. In order to characterize this site an in situ experimental procedure was followed. It consisted in measurements carried out with different instruments: two portable gamma ray spectrometers, two gamma dose rate meters, two radon monitors and one two channel working level monitor. Samples of tuff and pozzolana stones were also collected to be measured with gamma spectrometry in laboratory. Due to the high content of238U,232Th (more than 200 Bq kg-1for both radionuclides) and40K (more than 2000 Bq kg-1) of tuff and pozzolana, elevated levels of exposure to natural radioactivity were found: indeed, with different instruments and approach, a gamma dose rate of about 1 μGy h-1and an average radon concentration of about 10,000 Bq m-3, with a Potential Alpha Energy Concentration (PAEC) of 288 MeV cm-3, were measured. The radiological characteristics of Orvieto underground quarry make it a perfect site for "in field" intercomparisons of different measurement and dose assessment methods.
authors.affiliation: National Institute of Health, Technology and Health Department, Viale Regina Elena, 299, 00167, Rome, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Nuccetelli
authors.affiliation: Italian National Workers Compensation Authority (INAIL), Department of Medicine, Epidemiology, Workplace and Environmental Hygiene, Via Fontana Candida 1, 00040, Monteporzio Catone, Rome, Italy. Electronic address: r.trevisi@inail.it.
authors.forename: R
authors.initials: R
authors.lastname: Trevisi
authors.affiliation: Italian National Workers Compensation Authority (INAIL), Department of Medicine, Epidemiology, Workplace and Environmental Hygiene, Via Fontana Candida 1, 00040, Monteporzio Catone, Rome, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Leonardi
authors.affiliation: National Institute of Health, Technology and Health Department, Viale Regina Elena, 299, 00167, Rome, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Ampollini
authors.affiliation: National Institute of Ionizing Radiation Metrology, ENEA-CRE, 00123, S. Maria di Galeria, Rome, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Cardellini
authors.affiliation: Italian National Workers Compensation Authority (INAIL), Department of Medicine, Epidemiology, Workplace and Environmental Hygiene, Via Fontana Candida 1, 00040, Monteporzio Catone, Rome, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Tonnarini
authors.affiliation: National Building Research Institute - Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, 32000, Israel.
authors.forename: K
authors.initials: K
authors.lastname: Kovler
authors.affiliation: Department of Civil and Mechanical Engineering - University of Cassino and Southern Lazio, 03043, Cassino, Frosinone, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Vargas Trassiera
mesh_terms: D000336:Aerosols / Q000032:analysis*; D003252:Construction Materials / Q000032:analysis*; D007558:Italy; D011834:Radiation Monitoring; D011868:Radioisotopes / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013051:Spectrometry, Gamma
chemical_list: D000336:Aerosols; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive
keywords: Building materials; Gamma dose rate; Natural radioactivity; Radon; Radon and thoron decay products