New project on protection for indoor radon exposure

Result of a ventilation test in the mode "heat recovery" on the radon activity concentration of five living rooms
Result of a ventilation test in the mode "heat recovery" on the radon activity concentration of five living rooms

Project title: Protection for indoor radon exposure

Project description:

Since 31.12.2018, in Germany the "protection against radon in recreational rooms" (§§124, 125) and the "protection against radon at indoor workplaces" (§§126 - 132) are regulated by a new Radiation Protection Act (StrlSchG). For both areas a reference value of 300 Bq/m3 for the radon-222 activity concentration in the air, which was averaged over the year, was established.

With the definition of radon precautionary areas in Germany (end of 2020), there will be extensive obligations on those responsible for buildings with common rooms (apartments, schools, daycare centres, etc.) and buildings with workplaces in accordance with the Radiation Protection Act.

A simple, efficient and cost-effective radon protection measure for existing buildings is ventilation. However, the effect of manual ventilation on radon protection cannot be quantified without suitable measurement technology, as radon is not perceptible to the human senses. In addition, meteorological parameters influence the variation of indoor radon activity concentration (Schubert, Musolff, Weiss, 2018).

First ventilation experiments in an uninhabited apartment in the Erzgebirge, made possible by a financing of the UFZ's own technology transfer fund (WTT), were successfully carried out in 2019. It was demonstrated that radon activity concentrations can be significantly reduced by different ventilation modes of the built-in decentralized ventilation system (Dehnert et al., 2019).

The time-resolved dynamics of the radon activity concentration should be used as an additional control parameter for the automated control of decentralized ventilation systems with heat recovery and zone control.

The development of an integral system consisting of radon-sensitive sensor technology as well as communication and control software for decentralised ventilation systems is to be developed in a three-year ZIM-funded cooperation project between scientists of the UFZ Department of Environmental Informatics around Prof. Dr. Holger Weiß, SARAD GmbH in Dresden, inVENTer GmbH in Löberschütz, Bergsicherung Schneeberg GmbH & Co. KG, the Gebäude- und Wohnungsverwaltung GmbH Schlema, the Staatliche Betriebsgesellschaft für Umwelt und Landwirtschaft in Chemnitz and Dr. Jörg Dehnert, Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie LfULG in Dresden.

Project duration: 05/2020 - 04/2023

Funding organisation:

zim funding

Project partners:

  • UFZ Department of Environmental Informatics, Leipzig
  • SARAD GmbH, Dresden
  • inVENTer GmbH, Löberschütz
  • Bergsicherung Schneeberg GmbH & Co. KG
  • Gebäude- und Wohnungsverwaltung GmbH Schlema, Bad Schlema
  • Dr. Jörg Dehnert; Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie, Dresden
  • Staatliche Betriebsgesellschaft für Umwelt und Landwirtschaft, Chemnitz

Contact person: Prof. Dr. Holger Weiß (holger.weiss@ufz.de)


Schubert, M., Musolff, A., & Weiss, H. (2018): Influences of meteorological parameters on indoor radon concentrations ((222)Rn) excluding the effects of forced ventilation and radon exhalation from soil and building materials. J Environ Radioact, 192, 81-85. doi: 10.1016/j.jenvrad.2018.06.011

Dehnert et al. (2019): Radonschutz in Wohnungen durch radonaktivitätskonzentrationsgesteuerte Lüfter. Jahrestagung 2019 Fachverband für Strahlenschutz e.V.; Strahlenschutz und Medizin, Patienten - Beschäftigte – Gesellschaft; Würzburg, 9.-12. September 2019. Online available