Εμφάνιση απλής εγγραφής

dc.contributor.author Τέμενος, Νίκος el
dc.contributor.author Φιλιτσάκος, Σπυρίδων el
dc.contributor.author Χαλδέος, Ιωάννης el
dc.contributor.author Νικολόπουλος, Δημήτριος el
dc.contributor.author Γιαννακόπουλος, Παναγιώτης el
dc.date.accessioned 2015-06-16T23:19:54Z
dc.date.available 2015-06-16T23:19:54Z
dc.date.issued 2015-06-17
dc.identifier.uri http://hdl.handle.net/11400/16278
dc.rights Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.source http://www.sciencedirect.com en
dc.subject Ραδόνιο
dc.subject Αθήνα
dc.subject Ελλάδα
dc.subject Ραδιενέργεια
dc.subject Health hazards
dc.subject Κίνδυνοι για την υγεία
dc.title Hurst exponent of radon profiles indoors in Athens, Greece en
heal.type journalArticle
heal.classification Technology
heal.classification Physics
heal.classification Τεχνολογία
heal.classification Φυσική
heal.classificationURI http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI http://skos.um.es/unescothes/C02994
heal.classificationURI **N/A**-Τεχνολογία
heal.classificationURI **N/A**-Φυσική
heal.contributorName Πετράκη, Ερμιόνη el
heal.contributorName Κοττού, Σοφία el
heal.identifier.secondary doi:10.1016/j.ejmp.2014.07.265
heal.language en
heal.access campus
heal.publicationDate 2014
heal.bibliographicCitation Temenos, N., Filitsakos, S., Chaldeos, Y., Nikolopoulos, D., Yannakopoulos, P. (2014) Hurst exponent of radon profiles indoors in Athens, Greece. "Physica Medica", 30 (1), p.92 en
heal.abstract Radon and progeny (218Po, 214Pb, 214Bi and 214Po) are important radioactive indoor air pollutants of impact to humans. Radon enters buildings through gaps around pipes or cables and through cracks in floors. Human exposure depends on building characteristics, local geology and other parameters. All progeny nuclei may attach to aerosols, dust and water droplets creating hence radioactive mixtures which enter human lungs. This work focused on estimation of Hurst exponents (H) in daily radon signals collected in dwellings with Alpha Guard. H ranges between 0 < H < 1 and characterises the persistence properties of the recorded fluctuations. For H = 0.5 there is no correlation between the process increments. As it is well-known, in random walk which models classical Brownian diffusion the walker follows a random path driven by non-memory dynamics. Whenever the range is 0.5 < H < 1 it is identified, then that persistence of the signal (super-diffusion), i.e. if the amplitude of fluctuations increases in one time interval and it is likely to continue increasing in the period immediately following. The accumulation of fluctuations is faster than in classical Brownian motion. On the contrary the range 0 < H < 0.5 suggests anti-persistence or clustering (sub-diffusion), i.e. if the fluctuations increase in one period, it is likely to continue decreasing during the period immediately following, and vice versa. Finally at the limit H = 0 it does not grow at all and the signal is stationary. Hurst exponents were calculated by the R/S method in order to identify whether radon dynamics are governed by persistent, anti-persistent behaviour or if they are uncorrelated. We considered also whether the R/S method verified the values of the H exponent estimated by fractal spectral analysis. During years 2012-2013, 145 dwellings were accessed and their radon concentrations were measured. By employing sliding window R/S analysis of window length eight, Hurst exponents were found to be between the range of 0.5 < H < 1 in the majority of the situations. The latter finding indicates persistency. en
heal.publisher Elsevier en
heal.journalName Physica Medica en
heal.journalType peer-reviewed
heal.fullTextAvailability true


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Εμφάνιση απλής εγγραφής

Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες Εκτός από όπου ορίζεται κάτι διαφορετικό, αυτή η άδεια περιγράφεται ως Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες