Haanes , Hallvard, and Jostein Hoftuft. “Radon-220 Exhalation Methodology and Temporal Variation in a HBRA, Fen Complex”. Journal of the European Radon Association 6 (April 2, 2025). Accessed March 25, 2026. https://radonjournal.net/index.php/radon/article/view/10996.