1 / 14

Large decrease of radon concentrations in new-built Swedish dwellings

This study evaluates the dependencies between building year and radon levels in Swedish dwellings. The data from measurements analyzed during 2015-2017 shows a significant decrease in radon concentrations in new-built dwellings compared to the Swedish reference level. The study also investigates the impact of foundation and ventilation types on radon levels in single-family and multi-family houses. The findings suggest that the use of mechanical or balanced mechanical ventilation, along with slab-on-grade foundation, contributes to lower radon concentrations. These results have important implications for building practices and radon mitigation efforts.

alvarod
Download Presentation

Large decrease of radon concentrations in new-built Swedish dwellings

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Large decrease of radon concentrations in new-built Swedish dwellings by TryggveRönnqvist, Radonova tryggve.ronnqvist@radonova.com 2018 International Radon Symposium™

  2. Large decrease of radon concentrations in new-built Swedish dwellings Dependencies between building year and radon levels in Swedish dwellings were evaluated: Data from measurements analyzed during 2015-2017 Dwellings with building years from 1950 until 2016 Dependencies of foundation and ventilation type were investigated Data were compared against the Swedish reference level of 200 Bq/m3 (5.3 pCi/l) 2018 International Radon Symposium™

  3. Large decrease of radon concentrations in new-built Swedish dwellings Measurements in single-family houses 2018 International Radon Symposium™

  4. Large decrease of radon concentrations in new-built Swedish dwellings Measurements in apartments in multi-family houses 2018 International Radon Symposium™

  5. Large decrease of radon concentrations in new-built Swedish dwellings Single-family houses = ”Småhus” Multi-family houses = ”Flerbostadshus” Numberof new-builtdwellings in Sweden (source: SCB) 2018 International Radon Symposium™

  6. Large decrease of radon concentrations in new-built Swedish dwellings New buildings: are radon levels increasing with time? Measurements in single-family houses built 2002-2004 No statistical significant change can be seen, Kruskal-Wallis test (p-value = 0.4159) 2018 International Radon Symposium™

  7. Large decrease of radon concentrations in new-built Swedish dwellings Crawl space Basement Split level Slab on grade Radon levels and foundationtypes in single-family and multi-family houses 2018 International Radon Symposium™

  8. Large decrease of radon concentrations in new-built Swedish dwellings Today, most Swedish single-family houses arebuiltwithSlab on grade as foundationtype and veryfew new houses haveBasements. 2018 International Radon Symposium™

  9. Large decrease of radon concentrations in new-built Swedish dwellings Slab on gradetogetherwithBasementare the dominatingfoundationtypes in multi-family houses 2018 International Radon Symposium™

  10. Large decrease of radon concentrations in new-built Swedish dwellings Single-family houses Multi-family houses New single-family houses with mechanical or balanced mechanical ventilation have in average much lower radon concentrations than houses with only natural ventilation. Radon levels and ventilation types 2018 International Radon Symposium™

  11. Large decrease of radon concentrations in new-built Swedish dwellings Today, very few single-family houses have only natural ventilation, mechanical or balanced mechanical ventilation are dominating. 2018 International Radon Symposium™

  12. Large decrease of radon concentrations in new-built Swedish dwellings Today, most new multi-family houses have balanced mechanical ventilation. 2018 International Radon Symposium™

  13. Large decrease of radon concentrations in new-built Swedish dwellings Possible explanations for the decreased radon concentrations in new-built Swedish dwellings : Better and more uniform building practice. Mechanical or balanced mechanical ventilation are used in almost all new Swedish dwellings. Very few new single-family houses are built with basement, the dominating foundation type is slab on grade. 2018 International Radon Symposium™

  14. THANK YOU !! TryggveRönnqvist +46 706591708 tryggve.ronnqvist@radonova.com 2018 International Radon Symposium™

More Related