URANIUM CONTENT AND LEACHABLE FRACTION OF FLUORSPARS
| Autor: | Terry B. Councell, Edward R. Landa |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
inorganic chemicals
Minerals Toxicity characteristic leaching procedure Epidemiology Health Toxicology and Mutagenesis technology industry and agriculture Stockpile Radioactive waste Beneficiation Mineralogy chemistry.chemical_element Uranium complex mixtures Tailings Mining United States chemistry Radioactive Waste Environmental chemistry Radioactive contamination Humans Soil Pollutants Radioactive Radiology Nuclear Medicine and imaging Volume concentration |
| Zdroj: | Health Physics. 79:286-290 |
| ISSN: | 0017-9078 |
| DOI: | 10.1097/00004032-200009000-00009 |
| Popis: | Much attention in the radiological health community has recently focused on the management and regulation of naturally occurring radioactive materials. Although uranium-bearing minerals are present in a variety of fluorspar deposits, their potential consideration as naturally occurring radioactive materials has received only limited recognition. The uranium content of 28 samples of acid- and cryolite-grade (>97% CaF2) fluorspar from the National Defense Stockpile was found to range from 120 to 24,200 microg kg(-1), with a mean of 2,145 microg kg(-1). As a point of comparison, the average concentration of uranium in the upper crust of the earth is about 2,500 microg kg(-1). Leachability of this uranium was assessed by means of the Toxicity Characteristic Leaching Procedure (TCLP). The TCLP extractable fraction ranged from 1 to 98%, with a mean of 24% of the total uranium. The typically low concentrations of uranium seen in these materials probably reflects the removal of uranium-bearing mineral phases during the beneficiation of the crude fluorspar ore to achieve industrial specifications. Future NORM studies should examine crude fluorspar ores and flotation tailings. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|