Design Criteria for Achieving Acceptable Indoor Radon Concentration

Authors: T. Valdbjørn Rasmussen

Abstract:

Design criteria for achieving an acceptable indoor radon concentration are presented in this paper. The paper suggests three design criteria. These criteria have to be considered at the early stage of the building design phase to meet the latest recommendations from the World Health Organization in most countries. The three design criteria are; first, establishing a radon barrier facing the ground; second, lowering the air pressure in the lower zone of the slab on ground facing downwards; third, diluting the indoor air with outdoor air. The first two criteria can prevent radon from infiltrating from the ground, and the third criteria can dilute the indoor air. By combining these three criteria, the indoor radon concentration can be lowered achieving an acceptable level. In addition, a cheap and reliable method for measuring the radon concentration in the indoor air is described. The provision on radon in the Danish Building Regulations complies with the latest recommendations from the World Health Organization. Radon can cause lung cancer and it is not known whether there is a lower limit for when it is not harmful to human beings. Therefore, it is important to reduce the radon concentration as much as possible in buildings. Airtightness is an important factor when dealing with buildings. It is important to avoid air leakages in the building envelope both facing the atmosphere, e.g. in compliance with energy requirements, but also facing the ground, to meet the requirements to ensure and control the indoor environment. Infiltration of air from the ground underneath a building is the main providing source of radon to the indoor air.

Keywords: Radon, natural radiation, barrier, pressure lowering, ventilation.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1112041

References:

[1] Zeeb, H., Shannoun, F. (ed). 2009. WHO Handbook on indoor radon – a public health perspective. World Health Organization. Geneva. 94 p.
[2] Andersen, C. E., Bergsøe, N. C., Brendstrup, J., Damkjær, A., Gravesen, P., & Ulbak, K. 1997. Radon 95: En undersøgelse af metoder til reduktion af radonkoncentrationen i danske enfamiliehuse. Roskilde. 108 p.
[3] Trafik- og Byggestyrelsen (Danish Transport and Construction Agency). 2010. Bygningsreglement 2010. Copenhagen. 253 p.
[4] Bovbjerg Jensen R. and Gunnarsen L. 2008. Radonkoncentrationen i nye enfamiliehuse. Danish Building Research Institute – Aalborg University. 28 p.
[5] Clavensjö, B., and Åkerblom, G. 2004. Radonboken: Förebyggande åtgärder i nya byggnader. Stockholm: Formas. 106 p.
[6] Trafik- og Byggestyrelsen (Danish Transport and Construction Agency). 2007. Radon og enfamiliehuse. Copenhagen.15 p.
[7] Lehmann, R., Landfermann, H., Junkert, A., Schöppler, U (ed.). 2001. Radon-Handbuch Deutschland. Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit, Bonn. Bundesamt für Strahlenschutz, Salzgitter.
[8] Hagberg, N., Mjönes, L., & Söderman, A. 2009. Metodbeskrivning för mätning av radon i bostäder. Stockholm: Strålsäkerhetsmyndigheten. 19 p.
[9] Sundhedsstyrelsen (National Board of Health). 2010. Måling af radon. Webpage accessed 10-11-2010 at www.radon.dk
[10] Valdbjørn Rasmussen T. Wraber I. 2010 SBi-anvisning 232: Radon – måling og analyse. (SBi-instructions 232: Radon – measure and analyse; in Danish). Danish Building Research Institute-Aalborg University. Hørsholm. Denmark. 29 p.
[11] Valdbjørn Rasmussen T. 2010. SBi-anvisning 233: Radonsikring af nye bygninger. 2. ed. (SBi-instructions 233 2. ed.: Measures prenting radon to penetrate into new buildings; in Danish). Danish Building Research Institute-Aalborg University. Hørsholm. Denmark. 44 p.
[12] Rasmussen, T. V. 2013. Novel Radon Sub-Slab Suctioning System. Open Construction & Building Technology Journal. 7. pp. 13-19. 7 p.