Onyshchenko, G., Yakymenko, I., Shchus’, O. and Lokha, A. 2022. Sample Preparation for the Effective Accumulation and Detection of the Beta-Active Rn-222 Decay Products. East European Journal of Physics. 3 (Sep. 2022), 149-152. DOI:https://doi.org/10.26565/2312-4334-2022-3-19.