Saha , Uttam, Pamela Turner, David Parks, Derek Cooper, and Michael Kitto. “Long-Term Evaluation of a Reusable Radon-in-Water Proficiency Test”. Journal of the European Radon Association 4 (September 4, 2023). Accessed March 28, 2026. https://radonjournal.net/index.php/radon/article/view/9149.