Model to Balance an Acceptable Radon Level Indoors

Buildings

Thomas Cornelius¹  Torben Valdbjørn Rasmussen¹ 

[1] Department of Civil Engineering and Construction Management, BUILD, Aalborg University, A.C. Meyers Vænge 15, 2450 Copenhagen, Denmark;

关键词: model;    radon;    soil gas;    indoor materials;    penetration;    ventilation;   

DOI  :  10.3390/buildings12040447

来源: DOAJ

【 摘 要 】

A theoretical model is presented for balancing an acceptable radon concentration in indoor air. The infiltration of radon from the ground to the indoor air can be controlled by barriers or by lowering the air pressure at the lower zone of the ground slab. Indoor air with a radon concentration higher than that of outdoor air can further be controlled through the effective dilution of indoor air with outdoor air. The theory estimates the allowed radon infiltration from the ground to balance radon at an acceptable level indoors for a given ventilation rate, considering the radon contribution to the indoor air from indoor materials, building materials and the interior. A method using this theory is presented, identifying the necessary airtightness required for a radon barrier to balance the acceptable radon concentration for a building. Barriers include commercially used system solutions, such as bitumen-based radon blockers, wet-room membranes, reinforced fixed mortar pastes, and polyethene membranes. An acceptable indoor radon concentration of between 100 and 300 Bq/m³ in indoor air is used. Barriers are evaluated by their ability to prevent soil gas penetration from the ground in combination with their effect on the building durability, as barriers may create a far more vulnerable building.

【 授权许可】

Unknown