Abstract
Milli-fraction acid-resistant U and Th-bearing mineral hot particles are widespread across the US. The bonding of highly charged mid-size cations with Si+4 tetrahedron anions provide the most chemical resistant minerals against HF/HNO3/HClO4 dissolution attack. A search through over 3700 minerals in the Webmineral database yields a limits number of radioactivity bearing nesosilicate (10), sorosilicate (10), inosilicate (1), cyclosilicate (2), and phyllosilicate (1) minerals. Zircon and thorite are the likely bad actors, but a few other identified silicate minerals may also contribute to the problem of incomplete acid dissolution and therefore non-equilibration with radiochemical tracers.
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