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Hello there! I buy a beautiful megalodon tooth few years ago. Because I am curious I find that it is slightly radioactive ( 0.4µS/hours). I store it in a small showcase with other fossils. I read that fossilized shark teeth are made of apatite that can contain uranium and thorium. IF my tooth contain uranium, is there a risk of radon gaz accumulation in my showcase????? Thank you in advance Nicolas

Mustoe, G.E., 2020. Uranium Mineralization of Fossil Wood. Geosciences (Switzerland) 10(4):1-25 https://www.researchgate.net/publication/340609903_Uranium_Mineralization_of_Fossil_Wood https://www.mdpi.com/2076-3263/10/4/133 Yours, Paul H.

3 new beautiful uranium minerals discovered in southern Utah's Red Canyon By Herb Scribner, Deseret News, February 8, 2917 http://www.deseretnews.com/article/865672791/3-new-beautiful-uranium-minerals-discovered-in-southern-Utahs-Red-Canyon.html From Utah With Love and Thanks for All the Uranium By Allison Mills, University of Michiagn, February 6, 2017 http://www.mtu.edu/news/stories/2017/february/utah-love-thanks-for-all-uranium.html Three new uranium minerals from Utah, Michigan Technological University, February 8, 2017 https://www.sciencedaily.com/releases/2017/02/170208131820.htm https://phys.org/news/2017-02-utah-uranium.html The paper is: Halenius, H., F. Hatert, M. Pasero, and S. J. Mills, 2016,New minerals and nomenclature modifications approved in 2016. Mineralogical Magazine, vol. 80, no. 7: 1315 DOI: 10.1180/minmag.2016.080.086 http://www.ingentaconnect.com/content/minsoc/mag/2016/00000080/00000007/art00012;jsessionid=6fk5frosg8n0g.x-ic-live-03 Another Article is: Study helps explain why uranium persists in groundwater at former mining sites, SLAC National Accelerator Laboratory, February 2, 2017 https://www.sciencedaily.com/releases/2017/02/170202163234.htm The paper is: Sharon E. Bone, James J. Dynes, John Cliff, John R. Bargar. Uranium(IV) adsorption by natural organic matter in anoxic sediments. Proceedings of the National Academy of Sciences, 2017; 114 (4): 711 DOI: 10.1073/pnas.1611918114 http://www.pnas.org/content/114/4/711 Yours, Paul H.