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Régnier L, Dolgushev M, Bénichou O. Record ages of non-Markovian scale-invariant random walks. Nat Commun 2023; 14:6288. [PMID: 37813834 PMCID: PMC10562453 DOI: 10.1038/s41467-023-41945-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 09/25/2023] [Indexed: 10/11/2023] Open
Abstract
How long is needed for an observable to exceed its previous highest value and establish a new record? This time, known as the age of a record plays a crucial role in quantifying record statistics. Until now, general methods for determining record age statistics have been limited to observations of either independent random variables or successive positions of a Markovian (memoryless) random walk. Here we develop a theoretical framework to determine record age statistics in the presence of memory effects for continuous non-smooth processes that are asymptotically scale-invariant. Our theoretical predictions are confirmed by numerical simulations and experimental realisations of diverse representative non-Markovian random walk models and real time series with memory effects, in fields as diverse as genomics, climatology, hydrology, geology and computer science. Our results reveal the crucial role of the number of records already achieved in time series and change our view on analysing record statistics.
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Affiliation(s)
- Léo Régnier
- Laboratoire de Physique Théorique de la Matière Condensée, CNRS/Sorbonne Université, 4 Place Jussieu, 75005, Paris, France
| | - Maxim Dolgushev
- Laboratoire de Physique Théorique de la Matière Condensée, CNRS/Sorbonne Université, 4 Place Jussieu, 75005, Paris, France
| | - Olivier Bénichou
- Laboratoire de Physique Théorique de la Matière Condensée, CNRS/Sorbonne Université, 4 Place Jussieu, 75005, Paris, France.
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2
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Yu W, Lin F, Lin L. Bioturbation in sediment cores from the Clarion-Clipperton Zone in the northeast Pacific: Evidence from excess 210Pb. MARINE POLLUTION BULLETIN 2023; 188:114635. [PMID: 36739711 DOI: 10.1016/j.marpolbul.2023.114635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 01/08/2023] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
Radioactivity levels of 210Pb and 226Ra were measured to evaluate the bioturbation coefficients and mixing depths in one sediment core collected from the polymetallic nodule area inside the Clarion-Clipperton Zone (CCZ), a contract area of the China Ocean Mineral Resources Association (COMR) in the eastern Pacific Ocean. With a steady-state diffusion mode, the bioturbation coefficient and mixing depth of the sediment core were estimated to be 81.5 cm2/a and 51.3 cm, respectively, higher than that of the sediment core from the previous results from abyssal or global areas, which may be attributed to the distribution of total organic carbon (TOC) abundance. In addition, the transport flux of TOC from the surface layer to the deep layer were evaluated to be 1.15 mmol/(cm2·a), resulting in 83,200 tons of carbon buried annually into the sediment in the CCZ, indicating that a potential carbon sink will be disturbed with future exploration.
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Affiliation(s)
- W Yu
- School of National Safety and Emergency Management, Beijing Normal University, Zhuhai 519087, PR China
| | - F Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, PR China.
| | - L Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, PR China
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3
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Salazar‐Carballo PA, López‐Pérez M, Martín‐González ME, Hernández‐Suarez F, Martín‐Luis MC. Radon Dynamics and Effective Dose Estimation in a Touristic Volcanic Cave: La Cueva del Viento, Tenerife (Canary Islands, Spain). GEOHEALTH 2023; 7:e2022GH000704. [PMID: 36789206 PMCID: PMC9911345 DOI: 10.1029/2022gh000704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/28/2022] [Accepted: 10/03/2022] [Indexed: 05/06/2023]
Abstract
La Cueva del Viento is a volcanic lava tube located in Tenerife Island (Canary Islands, Spain). Its touristic section, 180 m long, receives more than 28,200 visitants each year. According to the European and Spanish legislation, a radon monitoring program is required to minimize the radon exposition of workers, tourists, and cavers. In this work, we studied the radon concentration dynamics in the touristic section of the cave for ca. 1 year, using both passive and active radon detectors. Pluviometry and external air temperature played an important role in the seasonal and daily variations of indoor radon concentrations. Daily fluctuations during the dry season were analyzed using time series (Box-Jenkins methodology) and frequency analysis (Fourier and Wavelet transforms) methods. The experimental radon time-series was well-fitted using a seasonal autoregressive integrated moving average model: Seasonal Auto-Regressive Integrated Moving Average (2,0,1) (2,1,0)24, and its value, in a short-time window (ca. 1 week) was conveniently forecasted. Finally, this work revealed that the annual effective doses received, during the observation period (1 year), by the touristic guides and visitors was ca. 2 mSv/yr and 4 μSv/hr, respectively. We concluded that the touristic exploitation of La Cueva del Viento is safe for both tourists and guides. However, based on our results, La Cueva del Viento had to be classified as a "Monitoring zone" and a regular monitoring program should be implemented.
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Affiliation(s)
- Pedro A. Salazar‐Carballo
- Departamento de Medicina Física y FarmacologíaFacultad de Ciencias de la SaludUniversidad de La LagunaSan Cristóbal de La LagunaSpain
- Laboratorio de Física Médica y Radioactividad AmbientalSEGAIUniversidad de La LagunaSan Cristóbal de La LagunaSpain
| | - María López‐Pérez
- Laboratorio de Física Médica y Radioactividad AmbientalSEGAIUniversidad de La LagunaSan Cristóbal de La LagunaSpain
| | | | - Francisco Hernández‐Suarez
- Laboratorio de Física Médica y Radioactividad AmbientalSEGAIUniversidad de La LagunaSan Cristóbal de La LagunaSpain
| | - M. Candelaria Martín‐Luis
- Departamento de Biología Animal, Edafología y GeologíaFacultad de CienciasUniversidad de La LagunaSan Cristóbal de La LagunaSpain
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4
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Armiento G, Barsanti M, Caprioli R, Chiavarini S, Conte F, Crovato C, De Cassan M, Delbono I, Montereali MR, Nardi E, Parrella L, Pezza M, Proposito M, Rimauro J, Schirone A, Spaziani F. Heavy metal background levels and pollution temporal trend assessment within the marine sediments facing a brownfield area (Gulf of Pozzuoli, Southern Italy). ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:814. [PMID: 36131187 PMCID: PMC9492602 DOI: 10.1007/s10661-022-10480-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 09/10/2022] [Indexed: 06/06/2023]
Abstract
In this study, site-specific natural background levels (NBLs) were determined for 18 elements (Al, As, Be, Cd, Co, Cu, Cr, Fe, Hg, K, Mn, Mo, Ni, Pb, Tl, U, V, and Zn) in two sediment cores collected offshore the Bagnoli-Coroglio brownfield site (Gulf of Pozzuoli, southern Italy) to accurately assess the degree of contamination and the historical trends in Heavy Metals (HMs) enrichment. This objective was pursued taking in account the high temporal and spatial variability of the geochemical properties of the area due to the local geothermal activity. Moreover, the temporal variation of Polycyclic Aromatic Hydrocarbons (PAHs) was investigated.226Ra was used as an extraordinary marker to confirm 210Pb dating. It especially allowed defining the geochronological framework of the sediment core closer the brownfield up to around 1500, providing compelling support to correlate the investigated elements' occurrences with natural geogenic dynamic. Sediment samples were accurately dated and analyzed for chemical and particle size composition. The contamination factor (Cf) and the pollution load index (PLI) showed very high enrichment of Cd, Cu, Hg, Pb, and Zn. The contamination profiles of HMs and PAHs follow the same pattern in both sediment cores, increasing from deep to upper layers. The highest contamination levels for HMs and PAHs were observed between 10 and 30 cm, corresponding to the periods of most intense industrial activity. Decreasing trends of pollutants were observed in the surface layers (0-10 cm), probably affected by a natural attenuation process due to the cessation of industrial activities.
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Affiliation(s)
- Giovanna Armiento
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Mattia Barsanti
- ENEA Santa Teresa Research Centre, Località Pozzuolo di Lerici, Department for Sustainability, Lerici, 19032, (SP), Italy
| | - Raffaela Caprioli
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Salvatore Chiavarini
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Fabio Conte
- ENEA Santa Teresa Research Centre, Località Pozzuolo di Lerici, Department for Sustainability, Lerici, 19032, (SP), Italy
| | - Cinzia Crovato
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Maurizio De Cassan
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Ivana Delbono
- ENEA Santa Teresa Research Centre, Località Pozzuolo di Lerici, Department for Sustainability, Lerici, 19032, (SP), Italy
| | - Maria R Montereali
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Elisa Nardi
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
- ISPRA, Italian Institute for Environmental Protection and Research, Via Vitaliano Brancati 48, 00144, Roma, Italy
| | - Luisa Parrella
- ENEA Portici Research Centre, Department for Sustainability, Piazzale Enrico Fermi 1, (NA), 80055, Portici, Italy
| | - Massimo Pezza
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Marco Proposito
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy
| | - Juri Rimauro
- ENEA Portici Research Centre, Department for Sustainability, Piazzale Enrico Fermi 1, (NA), 80055, Portici, Italy
| | - Antonio Schirone
- ENEA Santa Teresa Research Centre, Località Pozzuolo di Lerici, Department for Sustainability, Lerici, 19032, (SP), Italy
| | - Fabio Spaziani
- ENEA Casaccia Research Centre, Department for Sustainability, Via Anguillarese 301, 00123, Roma, Italy.
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5
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A Preliminary Study of the Characteristics of Radon Data from Indoor Environments and Building Materials in the Campania Region Using PCA and K-Means Statistical Analyses. ENVIRONMENTS 2022. [DOI: 10.3390/environments9070082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
For a healthy indoor environment, it is important to understand which materials and factors favor the generation of high levels of indoor radon. A preliminary multivariate statistical analysis was carried out on two datasets concerning indoor radon and building materials in the Campania Region using Principal Component Analysis (PCA) and the k-means partitional analysis technique. A total of 13 parameters related to building materials were used. The results show the greater contribution of building materials of volcanic origin to the concentration of indoor radon and thoron activity and the different influence of the parameters of the 31 materials analyzed. The same analyses applied to the indoor radon values of 694 rooms in the Campania Region were equally effective in assessing the structural characteristics of indoor environments that most influence indoor radon levels. The study provided an effective assessment of the influence on radon activity of several environmental parameters, which are often not adequately considered.
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La Verde G, Artiola V, La Commara M, D’Avino V, Angrisani L, Sabatino G, Pugliese M. COVID-19 and the Additional Radiological Risk during the Lockdown Period in the Province of Naples City (South Italy). Life (Basel) 2022; 12:246. [PMID: 35207532 PMCID: PMC8874998 DOI: 10.3390/life12020246] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/01/2022] [Accepted: 02/04/2022] [Indexed: 11/16/2022] Open
Abstract
The lockdown restrictions, as a first solution to contain the spread of the COVID-19 pandemic, have affected everyone's life and habits, including the time spent at home. The latter factor has drawn attention to indoor air quality and the impact on human health, particularly for chemical pollutants. This study investigated how the increasing time indoor influenced exposure to natural radioactive substances, such as radon gas. To calculate the radiological risk, we considered the most consolidated indices used for radiation protection: annual effective dose, excess lifetime cancer risk, and the lung cancer case. Furthermore, two different exposure times were considered: pre-lockdown and post-lockdown. The lockdown increased the indoor exposure time by 4% and, consequently, the radiological risk factors by 9%. Furthermore, the reference value of 300 Bq/m3, considered acceptable for human radiation protection, may need to be lowered further in the case of conditions similar to those of the lockdown period.
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Affiliation(s)
- Giuseppe La Verde
- National Institute for Nuclear Physics (INFN), Via Cinthia ed. 6, 80126 Naples, Italy; (M.L.C.); (V.D.); (M.P.)
- Department of Physics “E. Pancini”, University of Naples Federico II, Via Cinthia ed. 6, 80126 Naples, Italy
| | - Valeria Artiola
- Centre for Advanced Metrology and Technological Services (CeSMA), University of Naples Federico II, Corso Nicolangelo Protopisani, 80146 Naples, Italy; (V.A.); (G.S.)
| | - Marco La Commara
- National Institute for Nuclear Physics (INFN), Via Cinthia ed. 6, 80126 Naples, Italy; (M.L.C.); (V.D.); (M.P.)
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano, 49, 80131 Naples, Italy
| | - Vittoria D’Avino
- National Institute for Nuclear Physics (INFN), Via Cinthia ed. 6, 80126 Naples, Italy; (M.L.C.); (V.D.); (M.P.)
- Department of Physics “E. Pancini”, University of Naples Federico II, Via Cinthia ed. 6, 80126 Naples, Italy
| | - Leopoldo Angrisani
- Department of Information Technology and Electrical Engineering, University of Naples Federico II, Via Claudio, 21, 80125 Naples, Italy;
| | - Giuseppe Sabatino
- Centre for Advanced Metrology and Technological Services (CeSMA), University of Naples Federico II, Corso Nicolangelo Protopisani, 80146 Naples, Italy; (V.A.); (G.S.)
| | - Mariagabriella Pugliese
- National Institute for Nuclear Physics (INFN), Via Cinthia ed. 6, 80126 Naples, Italy; (M.L.C.); (V.D.); (M.P.)
- Department of Physics “E. Pancini”, University of Naples Federico II, Via Cinthia ed. 6, 80126 Naples, Italy
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7
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Study of Surface Emissions of 220Rn (Thoron) at Two Sites in the Campi Flegrei Caldera (Italy) during Volcanic Unrest in the Period 2011–2017. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11135809] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The study concerns the analysis of 220Rn (thoron) recorded in the surface soil in two sites of the Campi Flegrei caldera (Naples, Southern Italy) characterized by phases of volcanic unrest in the seven-year period 1 July 2011–31 December 2017. Thoron comes only from the most surface layer, so the characteristics of its time series are strictly connected to the shallow phenomena, which can also act at a distance from the measuring point in these particular areas. Since we measured 220Rn in parallel with 222Rn (radon), we found that by using the same analysis applied to radon, we obtained interesting information. While knowing the limits of this radioisotope well, we highlight only the particular characteristics of the emissions of thoron in the surface soil. Here, we show that it also shows some clear features found in the radon signal, such as anomalies and signal trends. Consequently, we provide good evidence that, in spite of the very short life of 220Rn compared to 222Rn, both are related to the carrier effect of CO2, which has significantly increased in the last few years within the caldera. The hydrothermal alterations, induced by the increase in temperature and pressure of the caldera system, occur in the surface soils and significantly influence thoron’s power of exhalation from the surface layer. The effects on the surface thoron are reflected in both sites, but with less intensity, the same behavior of 222Rn following the increasing movements and fluctuations of the geophysical and geochemical parameters (CO2 flux, fumarolic tremor, background seismicity, soil deformation). An overall linear correlation was found between the 222−220Rn signals, indicating the effect of the CO2 vector. The overall results represent a significant step forward in the use and interpretation of the thoron signal.
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8
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Tripaldi S, Telesca L, Lovallo M. Spectral and Informational Analysis of Temperature and Chemical Composition of Solfatara Fumaroles (Campi Flegrei, Italy). ENTROPY 2021; 23:e23050593. [PMID: 34064853 PMCID: PMC8151266 DOI: 10.3390/e23050593] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/28/2021] [Accepted: 05/06/2021] [Indexed: 11/16/2022]
Abstract
Temperature and composition at fumaroles are controlled by several volcanic and exogenous processes that operate on various time-space scales. Here, we analyze fluctuations of temperature and chemical composition recorded at fumarolic vents in Solfatara (Campi Flegrei caldera, Italy) from December 1997 to December 2015, in order to better understand source(s) and driving processes. Applying the singular spectral analysis, we found that the trends explain the great part of the variance of the geochemical series but not of the temperature series. On the other hand, a common source, also shared by other geo-indicators (ground deformation, seismicity, hydrogeological and meteorological data), seems to be linked with the oscillatory structure of the investigated signals. The informational characteristics of temperature and geochemical compositions, analyzed by using the Fisher–Shannon method, appear to be a sort of fingerprint of the different periodic structure. In fact, the oscillatory components were characterized by a wide range of significant periodicities nearly equally powerful that show a higher degree of entropy, indicating that changes are influenced by overlapped processes occurring at different scales with a rather similar intensity. The present study represents an advancement in the understanding of the dominant driving mechanisms of volcanic signals at fumaroles that might be also valid for other volcanic areas.
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Affiliation(s)
- Simona Tripaldi
- Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Campus Universitario, via Orabona 4, 70125 Bari, Italy
- Correspondence: (S.T.); (L.T.); (M.L.)
| | - Luciano Telesca
- Institute of Methodologies for Environmental Analysis, National Research Council, 85050 Tito, Italy
- Correspondence: (S.T.); (L.T.); (M.L.)
| | - Michele Lovallo
- Agenzia Regionale per la Protezione dell’Ambiente della Basilicata, 85100 Potenza, Italy
- Correspondence: (S.T.); (L.T.); (M.L.)
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9
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Sabbarese C, Ambrosino F, D'Onofrio A. Development of radon transport model in different types of dwellings to assess indoor activity concentration. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2021; 227:106501. [PMID: 33310392 DOI: 10.1016/j.jenvrad.2020.106501] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 11/29/2020] [Indexed: 06/12/2023]
Abstract
The influence of different building types on the activity concentration of Radon indoor is studied through transport models in soil and building materials. The numerical solutions of the relevant transport equations are solved by the finite differences method (FDM) and used to evaluate the indoor Radon activity concentration. Several boundary conditions are introduced to simulate the Radon entry into the buildings from soils and to assess the Radon activity concentration at the different floors. The types of dwelling investigated differ in the position of the lower floor respect to the ground. Comparisons are made to modeling assessments obtained considering different soil characteristics underneath the building and building materials to simulate indoor Radon activity concentration. These investigations lead to the conclusion that, in addition to the nature of the soil and building materials, the position of lower floor of dwellings plays a significant role in determining the amount of radon entry into residential buildings. This work is effective to assess the health hazards coming from the Radon accumulation in living environments.
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Affiliation(s)
- C Sabbarese
- Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Viale Lincoln 5, 81100, Caserta, Italy.
| | - F Ambrosino
- Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Viale Lincoln 5, 81100, Caserta, Italy
| | - A D'Onofrio
- Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Viale Lincoln 5, 81100, Caserta, Italy
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Connection between 222Rn emission and geophysical-geochemical parameters recorded during the volcanic unrest at Campi Flegrei caldera (2011–2017). Appl Radiat Isot 2020; 166:109385. [PMID: 32979758 DOI: 10.1016/j.apradiso.2020.109385] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 08/13/2020] [Accepted: 08/14/2020] [Indexed: 11/22/2022]
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11
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Ambrosino F, Roca V, Buompane R, Sabbarese C. Development and calibration of a method for direct measurement of 220Rn (thoron) activity concentration. Appl Radiat Isot 2020; 166:109310. [DOI: 10.1016/j.apradiso.2020.109310] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 05/24/2020] [Accepted: 06/22/2020] [Indexed: 10/23/2022]
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Ambrosino F, Thinová L, Briestenský M, Sabbarese C. STUDY OF 222RN CONTINUOUS MONITORING TIME SERIES AND DOSE ASSESSMENT IN SIX EUROPEAN CAVES. RADIATION PROTECTION DOSIMETRY 2020; 191:233-237. [PMID: 33123740 DOI: 10.1093/rpd/ncaa159] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The present work aims to assess the effective doses from long-term continual radon monitoring in six European caves (Slovenia, Slovakia and the Czech Republic), including influencing environmental factors. Caves are important radiation protection subjects because of elevated radon activity concentration (~kBq/m3), mostly due to the low natural ventilation. The sources of radon gas are most often underground rock layers and clastic sediments. The radon activity concentrations show seasonal variations, for which the outside temperature is the main driving force. The human health impact due to the radon inhalation in monitored caves was estimated through the annual effective dose, using the methodology provided by the International Commission on Radiological Protection (ICRP Publication 137). The annual effective dose could reach several tens of mSv, depending on the working hours spent in the underground.
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Affiliation(s)
- F Ambrosino
- Department of Mathematics and Physics, The University of Campania ``Luigi Vanvitelli'', Viale Lincoln 5, 81100 Caserta, Italy
| | - L Thinová
- Czech Technical University, Faculty of Nuclear Sciences and Physical Engineering, Břehová 7, 11519 Prague 1, Czech Republic
| | - M Briestenský
- Institute of Rock Structure and Mechanics, Czech Academy of Sciences, V Holešovičkách 41, 18209 Prague 8, Czech Republic
| | - C Sabbarese
- Department of Mathematics and Physics, The University of Campania ``Luigi Vanvitelli'', Viale Lincoln 5, 81100 Caserta, Italy
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13
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Sabbarese C, Ambrosino F, Roca V. ANALYSIS BY SCANNER OF TRACKS PRODUCED BY RADON ALPHA PARTICLES IN CR-39 DETECTORS. RADIATION PROTECTION DOSIMETRY 2020; 191:154-159. [PMID: 33125480 DOI: 10.1093/rpd/ncaa140] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The most used passive detectors for Radon measurement are the CR39s, both for the good stability of the material and for the practicality of use. But, commercial reading systems are expensive and not always fast. The aim of the present work was the development of a method for a rapid, efficient and economic evaluation of the result of the indoor Radon measurement performed with CR39 detectors. The analysis and acquisition of detector images were performed using a photo scanner and the free ImageJ software. Several groups of CR-39 detectors were exposed, developed and analysed. Calibration curve was obtained in a wide range of exposure values (200-12 000 kBq·h·m -3) to allow the procedure to be applied in all possible measurement environments. Furthermore, a statistical study was carried out on the shape and size of nuclear tracks after chemical development. The dependence of the track size on Radon exposure was effective in showing the trace saturation effect as well.
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Affiliation(s)
- C Sabbarese
- Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Viale Lincoln 5, Caserta 81100, Italy
- National Institute for Nuclear Physics (INFN), Branch of Naples, via Cintia 21, Naples 80126, Italy
| | - F Ambrosino
- Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Viale Lincoln 5, Caserta 81100, Italy
- National Institute for Nuclear Physics (INFN), Branch of Naples, via Cintia 21, Naples 80126, Italy
| | - V Roca
- National Institute for Nuclear Physics (INFN), Branch of Naples, via Cintia 21, Naples 80126, Italy
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14
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A Google Earth Engine Tool to Investigate, Map and Monitor Volcanic Thermal Anomalies at Global Scale by Means of Mid-High Spatial Resolution Satellite Data. REMOTE SENSING 2020. [DOI: 10.3390/rs12193232] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Several satellite-based systems have been developed over the years to study and monitor thermal volcanic activity. Most of them use high temporal resolution satellite data, provided by sensors like the Moderate Resolution Imaging Spectroradiometer (MODIS) that if on the one hand guarantee a continuous monitoring of active volcanic areas on the other hand are less suited to map thermal anomalies, and to provide accurate information about their features. The Multispectral Instrument (MSI) and the Operational Land Imager (OLI), respectively, onboard the Sentinel-2 and Landsat-8 satellites, providing Short-Wave Infrared (SWIR) data at 20 m (MSI) and 30 m (OLI) spatial resolution, may make an important contribution in this area. In this work, we present the first Google Earth Engine (GEE) App to investigate, map and monitor volcanic thermal anomalies at global scale, integrating Landsat-8 OLI and Sentinel-2 MSI observations. This open tool, which implements the Normalized Hot spot Indices (NHI) algorithm, enables the analysis of more than 1400 active volcanoes, with very low processing times, thanks to the high GEE computational resources. Performance and limitations of the tool, such as its next upgrades, aiming at increasing the user-friendly experience and extending the temporal range of data analyses, are analyzed and discussed.
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Ambrosino F, Sabbarese C, Roca V, Giudicepietro F, Chiodini G. Analysis of 7-years Radon time series at Campi Flegrei area (Naples, Italy) using artificial neural network method. Appl Radiat Isot 2020; 163:109239. [DOI: 10.1016/j.apradiso.2020.109239] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/15/2020] [Accepted: 05/19/2020] [Indexed: 10/24/2022]
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