Pieces of Fukushima reactor cores still floating around, new study reveals — Hot particles with over 1 Quadrillion becquerels per kilogram detected — Radioactive materials contain Uranium, Polonium, Americium (VIDEO)

Science of the Total Environment, by Marco Kaltofen (Nuclear Science and Engineering Program, Department of Physics, Worcester Polytechnic Institute) and Arnie Gundersen (Fairewinds Energy Education), Dec 2017 (emphasis added): Radioactively-hot particles detected in dusts and soils from Northern Japan… Radioactive particles from Fukushima are tracked via dusts, soils, and sediments; Radioactive dust impacts are tracked in both Japan and the United States/Canada; Atypically-radioactive particles from reactor cores are identified in house dusts… After the March 11, 2011, nuclear reactor meltdowns at Fukushima Dai-ichi, 180 samples of Japanese particulate matter (dusts and surface soils) and 235 similar U.S. and Canadian samples were collected and analyzed…