alexa Hurst Exponent Analysis of Indoor Radon Profiles of Gre
ISSN: 2161-0398

Journal of Physical Chemistry & Biophysics
Open Access

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Research Article

Hurst Exponent Analysis of Indoor Radon Profiles of Greek Apartment Dwellings

Dimitrios Nikolopoulos1*, Ermioni Petraki2, Nikolaos Temenos1, Sofia Kottou3, Dionysios Koulougliotis4 and Panayotis H Yannakopoulos1
1TEI of Piraeus, Department of Electronic Computer Systems Engineering, Petrou Ralli & Thivon 250, GR-12244 Aigaleo, Greece
2Brunel University, Department of Engineering and Design, Kingston Lane, Uxbridge, Middlesex UB8 3PH, London, UK
3University of Athens, Medical School, Department of Medical Physics, Mikras Asias 75, GR-11527 Athens, Greece
4Technological Educational Institute (TEI) of Ionian Islands, Department of Environmental Technology, Neo Ktirio, Panagoula 29100, Zakynthos, Greece
Corresponding Author : Dimitrios Nikolopoulos
TEI of Piraeus, Department of Electronic
Computer Systems Engineering
Petrou Ralli & Thivon 250
GR- 12244 Aigaleo, Greece
Tel: +0030-210-5381110
Fax: +0030-210-5381436
E-mail: [email protected]; [email protected]
Received: November 07, 2014; Accepted: December 28, 2014; Published: December 10, 2014
Citation: Nikolopoulos D, Petraki E, Temenos N, Kottou S, Koulougliotis D, et al (2014) Hurst Exponent Analysis of Indoor Radon Profiles of Greek Apartment Dwellings. J Phys Chem Biophys 4:168. doi:10.4172/2161-0398.1000168
Copyright: © 2014 Nikolopoulos D, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

Radon and progeny (218Po, 214Pb, 214Bi and 214Po) are important indoor radioactive air pollutants with impact to humans. Radon is an inert gas that enters buildings from outdoor air, water and soil, especially via gaps around pipes and cables and through cracks in floors. Indoors, radon progeny remain free, or attach to indoor aerosols dust and water droplets. Hence, inhalable indoor radioactive mixtures are created which enter human lungs and irradiate tissues. The radiation exposure depends on several parameters some of which are the building characteristics, local geology, breathing rate and others. This work aimed to estimate Hurst exponents (H) of time-evolving radon signals of Greek apartment dwellings. The signals were collected with Alpha Guard Pro and include at least 24 hours of measurements in each dwelling. Hurst exponents were calculated by the R/S method through sliding on overlapping windows and lumping on nonoverlapping sequential windows. The scope was to identify whether radon dynamics are governed by persistent, antipersistent behavior or if these are uncorrelated. Most signals presented significant long-memory segments with important persistent sub- segments.

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