caa a22 4500 467904456 CHVBK 20180406152829.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s10661-006-4777-z doi (NATIONALLICENCE)springer-10.1007/s10661-006-4777-z Geographic Variability in Radon Exhalation at a Rehabilitated Uranium Mine in the Northern Territory, Australia [Elektronische Daten] [Andreas Bollhöfer, John Storm, Paul Martin, Stephen Tims] In this study, dry season radon flux densities and radon fluxes have been determined at the rehabilitated Nabarlek uranium mine in northern Australia using conventional charcoal canisters. Environmental background levels amounted to 31± 15 milli Becquerel per m2 per second (mBq m−2 s−1). Radon flux densities within the fenced rehabilitated mine area showed large variations with a maximum of 6500 mBq m−2 s−1 at an area south of the former pit characterised by a disequilibrium between 226Ra and 238U. Radon flux densities were also high above the areas of the former pit (mean 971 mBq m−2 s−1) and waste rock dump (mean 335 mBq m−2 s−1). The lower limit for the total pre-mining radon flux from the fenced area (140 ha) was estimated to 214 kBq s−1, post-mining radon flux amounted to 174 kBq s−1. Our study highlights that the results of radon flux studies are vitally dependant on the selection of individual survey points. We suggest the use of a randomised system for both the selection of survey points and the placement of charcoal canisters at each survey point, to avoid over estimation of radon flux densities. It is also important to emphasize the significance of having reliable pre-mining radiological data available to assess the success of rehabilitation of a uranium mine site. Springer Science + Business Media, Inc., 2006 radon flux nationallicence Nabarlek nationallicence radiological assessment nationallicence rehabilitation nationallicence sampling design nationallicence uranium mining nationallicence Bollhöfer Andreas Environmental Research Institute of the Supervising Scientist (eriss), 0801, Darwin NT, Australia aut Storm John Department of Physics and Mathematical Physics, University of Adelaide, Australia aut Martin Paul Environmental Research Institute of the Supervising Scientist (eriss), 0801, Darwin NT, Australia aut Tims Stephen Environmental Research Institute of the Supervising Scientist (eriss), 0801, Darwin NT, Australia aut Environmental Monitoring and Assessment Springer Netherlands 114/1-3(2006-03-01), 313-330 0167-6369 114:1-3<313 2006 114 10661 https://doi.org/10.1007/s10661-006-4777-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-006-4777-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bollhöfer Andreas Environmental Research Institute of the Supervising Scientist (eriss), 0801, Darwin NT, Australia aut NATIONALLICENCE 700 1- Storm John Department of Physics and Mathematical Physics, University of Adelaide, Australia aut NATIONALLICENCE 700 1- Martin Paul Environmental Research Institute of the Supervising Scientist (eriss), 0801, Darwin NT, Australia aut NATIONALLICENCE 700 1- Tims Stephen Environmental Research Institute of the Supervising Scientist (eriss), 0801, Darwin NT, Australia aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Springer Netherlands 114/1-3(2006-03-01), 313-330 0167-6369 114:1-3<313 2006 114 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer