title: Airborne uranium contamination--as revealed through elemental and isotopic analysis of tree bark.
abstract: A new strategy for characterisation of airborne uranium contamination based on ICP mass spectrometric analysis of tree bark is described. The uranium content of tree barks (50 samples) obtained from diverse locations (remote, rural, industrial) varied over almost four orders of magnitude (0.001-8.3 micrograms/g U) with maximum concentrations recorded in the vicinity of a nuclear fuel fabrication plant (0.70-8.3 micrograms/g U). Elevated concentrations were also observed near a coal-fired power station (0.25-0.38 microgram/g U). Isotopic analysis revealed significant deviation from the natural uranium isotope ratio (235U/238U, 0.00725) at four nuclear installations (235U/238U, 0.0055-0.0097). These findings indicate that tree bark serves as an effective biomonitor for uranium and, with isotopic analysis, discrimination between nuclear and non-nuclear emissions is realised.
authors.affiliation: Centre for Analytical Sciences, Department of Chemistry, University of Sheffield, Dainton Building, Sheffield S3 7HF, UK.
authors.forename: D
authors.initials: D
authors.lastname: Bellis
authors.forename: R
authors.initials: R
authors.lastname: Ma
authors.forename: N
authors.initials: N
authors.lastname: Bramall
authors.forename: C W
authors.initials: CW
authors.lastname: McLeod
authors.forename: N
authors.initials: N
authors.lastname: Chapman
authors.forename: K
authors.initials: K
authors.lastname: Satake
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis* / Q000493:pharmacokinetics; D015415:Biomarkers / Q000032:analysis; D003031:Coal; D004784:Environmental Monitoring / Q000379:methods*; D011210:Power Plants; D014197:Trees / Q000737:chemistry*; D014501:Uranium / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D000396:Air Pollutants, Radioactive; D015415:Biomarkers; D003031:Coal; D014501:Uranium