Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Radon and Natural Ventilation in Newer Danish Single‐Family Houses
Abstract To investigate the effect of ventilation on indoor radon (222Rn), simultaneous measurements of radon concentrations and air change rates were made in 117 Danish naturally ventilated slab‐on‐grade houses built during the period 1984–1989. Radon measurements (based on CR‐39 alpha‐track detectors) and air change rate measurements (based on the perfluorocarbon tracer technique; PFT) were in the ranges 12–620 Bq m−3 and 0.16−0.96 h−1, respectively. Estimates of radon entry rates on the basis of such time‐averaged results are presented and the associated uncertainty is discussed. It was found that differences in radon concentrations from one house to another are primarily caused by differences in radon entry rates whereas differences in air change rates are much less important (accounting for only 80,0% of the house‐to‐house variation). In spite of the large house‐to‐house variability of radon entry rates it was demonstrated, however, that natural ventilation does have a significant effect on the indoor radon concentration. Most importantly, it was found that the group of houses with an air change rate above the required level of 0.5 h−1 on average had an indoor radon concentration that was only 50% (0.5±0.1) of that of the group of houses with air change rates below 0.5 h−1. The reducing effect of increased natural ventilation on the indoor radon concentration was found to be due mainly to dilution of indoor air. No effect could be seen regarding reduced radon entry rates.
Radon and Natural Ventilation in Newer Danish Single‐Family Houses
Abstract To investigate the effect of ventilation on indoor radon (222Rn), simultaneous measurements of radon concentrations and air change rates were made in 117 Danish naturally ventilated slab‐on‐grade houses built during the period 1984–1989. Radon measurements (based on CR‐39 alpha‐track detectors) and air change rate measurements (based on the perfluorocarbon tracer technique; PFT) were in the ranges 12–620 Bq m−3 and 0.16−0.96 h−1, respectively. Estimates of radon entry rates on the basis of such time‐averaged results are presented and the associated uncertainty is discussed. It was found that differences in radon concentrations from one house to another are primarily caused by differences in radon entry rates whereas differences in air change rates are much less important (accounting for only 80,0% of the house‐to‐house variation). In spite of the large house‐to‐house variability of radon entry rates it was demonstrated, however, that natural ventilation does have a significant effect on the indoor radon concentration. Most importantly, it was found that the group of houses with an air change rate above the required level of 0.5 h−1 on average had an indoor radon concentration that was only 50% (0.5±0.1) of that of the group of houses with air change rates below 0.5 h−1. The reducing effect of increased natural ventilation on the indoor radon concentration was found to be due mainly to dilution of indoor air. No effect could be seen regarding reduced radon entry rates.
Radon and Natural Ventilation in Newer Danish Single‐Family Houses
Andersen, Claus E. (Autor:in) / Bergsøe, Niels C. (Autor:in) / Majborn, Benny (Autor:in) / Ulbak, Kaare (Autor:in)
Indoor Air ; 7 ; 278-286
01.12.1997
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
NEW TYPICAL AND ATYPICAL DANISH SINGLE-FAMILY HOUSES
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| BASE | 2018