alexa Response of CR-39 Polymer Radon-Sensors via Monte-Carlo
ISSN: 2161-0398

Journal of Physical Chemistry & Biophysics
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Research Article

Response of CR-39 Polymer Radon-Sensors via Monte-Carlo Modelling and Measurements

Dimitrios Nikolopoulos1*, Sofia Kottou2, Ermioni Petraki1,3, Efstratios Vogiannis4 and Panayiotis H.Yannakopoulos1
1Department of Electronic Computer Systems Engineering, TEI of Piraeus, Greece, Petrou Ralli & Thivon 250, GR122 44, Aigaleo, Greece
2Medical Physics Department, Medical School, University of Athes, Mikras Asias 75, GR11527, Goudi, Greece
3Department of Engineering and Design, Brunel University, Kingston Lane, Uxbridge, Middlesex UB8 3PH, London, UK
4Evangeliki Model School of Smyrna, Lesvou 4, GR17123, Greece
Corresponding Author : Dimitrios Nikolopoulos
Department of Electronic Computer Systems Engineering
TEI of Piraeus, Greece, Petrou Ralli & Thivon 250
GR122 44, Aigaleo, Greece
Tel: +0030-210-5381560
Mobile: +0030-6977-208318
Fax: +0030-210-5381436
E-mail: [email protected]; [email protected]
Received March 29, 2014; Accepted May 22, 2014; Published May 24, 2014
Citation: Nikolopoulos D, Kottou S, Petraki E, Vogiannis E, Yannakopoulos PH. (2014) Response of CR-39 Polymer Radon-Sensors via Monte-Carlo Modelling and Measurements. J Phys Chem Biophys 4:144. doi:10.4172/2161-0398.1000144
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

International studies of radon indoors and in workplaces have shown significant radiation dose burden of the general population due to inhalation of radon (222Rn) and its short-lived progeny (218Po,214Pb, 214Bi, 214Po). As far as atmospheric radon concerns, 222Rn, is not necessarily in equilibrium with its short-lived progeny. For this reason, radon’s equilibrium factor F was solved graphically as a function of the track density ratio R=TB/TR, namely of the ratio between the recordings of cup-type and bare CR-39 detectors. TB was computed through special Monte-Carlo codes which were implemented for the calculation of the efficiency of bare CR-39 polymers, regarding their ability in sensing the alpha particles emitted by the decay of radon and its short-lived progeny. For a realistic approach, Monte-Carlo inputs were adjusted according to actual experimental concentration measurements of radon, decay products and F of Greek apartment dwellings. Concentration measurements were further utilized for the calculation of the unattached fraction, fp, in terms of Potential Alpha Energy Concentration (PAEC, defined as the sum of the initial - per volume - energies of all alpha particles emitted due to the decay of radon and its short-lived progeny that are present within a certain amount of air). This was employed for the calculation of F in terms of ratio (A4/A0), where Ai represents the activity concentration of radon (i=0) and 214Po (i=4) respectively. Measured and calculated values of F were plotted versus R. The results were fitted and checked with model’s predictions.

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