Radioactive and radiogenic isotopes in sediments from Cooper Creek, Western Arnhem Land

Frostick, A., Bollhöfer, A., Parry, D., Munksgaard, N., and Evans, K. (2008) Radioactive and radiogenic isotopes in sediments from Cooper Creek, Western Arnhem Land. Journal of Environmental Radioactivity, 99 (3). pp. 468-482.

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Abstract

Protection of the environment post-mining is a key objective of rehabilitation, especially where runoff and erosion from rehabilitated mine sites could potentially lead to contamination of the surrounding land and watercourses. As part of an overall assessment of the success of rehabilitation at the former Nabarlek uranium (U) mine, an appraisal of stable lead (Pb) isotopes, radionuclides and trace metals within sediments and soils was conducted to determine the off site impacts from a spatial and temporal perspective. The study found localised areas on and adjacent to the site where soils had elevated levels of trace metals and radionuclides. Lead isotope ratios are highly radiogenic in some samples, indicating the presence of U-rich material. There is some indication that erosion products with more radiogenic Pb isotope ratios have deposited in sediments downstream of the former ore body. However, there is no indication that the radiogenic erosion products found on the mine site at present have significantly contaminated sediments further downstream of Cooper Creek.

Item ID: 18778
Item Type: Article (Research - C1)
ISSN: 1879-1700
Keywords: stable lead isotopes, mine site rehabilitation, radionuclides, trace metals
Date Deposited: 26 Sep 2011 22:52
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 50%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 50%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960508 Ecosystem Assessment and Management of Mining Environments @ 50%
96 ENVIRONMENT > 9609 Land and Water Management > 960908 Mining Land and Water Management @ 50%
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