Radioactivity of peat mud used in therapy

Karpińska M, Mnich K, Kapała J, Bielawska A, Kulesza G, Mnich S
J Environ Radioact. 2016 Feb;152:97-100. doi: 10.1016/j.jenvrad.2015.11.013. Epub 2015 Dec 8

https://www.ncbi.nlm.nih.gov/pubmed/26675542