Abstract

Nuclear emulsion microscopy has demonstrated the presence of small, intense α-particle emitting crystallites in laboratory-produced tailings derived from the sulfuric acid milling of uranium ores. The α-particle activity is associated with the isotope pair 210 Pb/ 210 Po, and the host mineral appears to be PbSO 4 occurring as inclusions in gypsum laths. These particles represent potential inhalation hazards at uranium mill tailings disposal areas

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