title: Bioaccessibility of U, Th and Pb in solid wastes and soils from an abandoned uranium mine.
abstract: Bioaccessible U, Th, Pb and the238U decay products214Pb and210Pb have been determined, using a modified Unified BARGE Method (UBM), in waste solids and soils from an abandoned uranium mine in South West England, UK. Maximum aqua regia extractable concentrations for U, Th and Pb were 16,200, 3.8 and 4750 μg g-1, respectively.238U had highest activity concentrations near the mine shaft, where the decay products214Pb and210Pb had values of 235 and 180 Bq g-1, respectively. UBM extractions gave mean gastro-intestinal bioaccessibility factors (BAFs) for U and Pb in the waste solids of 0.05 and 0.03, respectively, whereas those for the soils were significantly higher at 0.24 and 0.17. The mean BAFs for the transient radionuclides,214Pb and210Pb, were similar to those for stable Pb implying that the stable and radioactive Pb isotopes were attached to similar sites on the particles. The doses arising from the ingestion of particulate210Pb due to soil pica behaviour were in the range 0.2-65 and < 0.1-6.2 μSv day-1for a 1-year old child or an adult (>17 years), respectively. The results suggest that the health risk posed by abandoned uranium mines, with waste rock and tailings, throughout the world should take account of the dose due to both bioaccessible radionuclides, as well as their stable counterparts.
authors.affiliation: Plymouth University, School of Geography, Earth and Environmental Sciences, Portland Square, Drake Circus, Plymouth PL4 8AA, United Kingdom. Electronic address: mfoulkes@plymouth.ac.uk.
authors.forename: Michael
authors.initials: M
authors.lastname: Foulkes
authors.affiliation: Plymouth University, Consolidated Radio-isotope Facility, Drake Circus, Plymouth PL4 8AA, United Kingdom. Electronic address: gmillward@plymouth.ac.uk.
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Millward
authors.affiliation: Plymouth University, School of Geography, Earth and Environmental Sciences, Portland Square, Drake Circus, Plymouth PL4 8AA, United Kingdom.
authors.forename: Samuel
authors.initials: S
authors.lastname: Henderson
authors.affiliation: Plymouth University, School of Geography, Earth and Environmental Sciences, Portland Square, Drake Circus, Plymouth PL4 8AA, United Kingdom. Electronic address: wblake@plymouth.ac.uk.
authors.forename: William
authors.initials: W
authors.lastname: Blake
mesh_terms: D007856:Lead Radioisotopes / Q000032:analysis*; D008906:Mining; D011834:Radiation Monitoring; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013910:Thorium / Q000032:analysis*; D014501:Uranium / Q000032:analysis*
chemical_list: D007856:Lead Radioisotopes; D012990:Soil Pollutants, Radioactive; D014501:Uranium; D013910:Thorium
keywords: Bioaccessibility; Dose; Mine; Radioactivity; Solid wastes; Uranium