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Atmospheric stability effects on potential radiological releases at a nuclear research facility in Romania: Characterising the atmospheric mixing state.
Chambers, Scott D; Galeriu, Dan; Williams, Alastair G; Melintescu, Anca; Griffiths, Alan D; Crawford, Jagoda; Dyer, Leisa; Duma, Marin; Zorila, Bogdan.
Afiliación
  • Chambers SD; Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia. Electronic address: szc@ansto.gov.au.
  • Galeriu D; "Horia Hulubei" National Institute for Physics and Nuclear Engineering, 30 Reactorului St., POB MG-6, 077125 Bucharest, Magurele, Romania.
  • Williams AG; Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
  • Melintescu A; "Horia Hulubei" National Institute for Physics and Nuclear Engineering, 30 Reactorului St., POB MG-6, 077125 Bucharest, Magurele, Romania.
  • Griffiths AD; Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
  • Crawford J; Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
  • Dyer L; Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
  • Duma M; "Horia Hulubei" National Institute for Physics and Nuclear Engineering, 30 Reactorului St., POB MG-6, 077125 Bucharest, Magurele, Romania.
  • Zorila B; "Horia Hulubei" National Institute for Physics and Nuclear Engineering, 30 Reactorului St., POB MG-6, 077125 Bucharest, Magurele, Romania; Department of Electricity, Solid Physics and Biophysics, Faculty of Physics, University of Bucharest, Magurele, Romania.
J Environ Radioact ; 154: 68-82, 2016 Apr.
Article en En | MEDLINE | ID: mdl-26854556
A radon-based nocturnal stability classification scheme is developed for a flat inland site near Bucharest, Romania, characterised by significant local surface roughness heterogeneity, and compared with traditional meteorologically-based techniques. Eight months of hourly meteorological and atmospheric radon observations from a 60 m tower at the IFIN-HH nuclear research facility are analysed. Heterogeneous surface roughness conditions in the 1 km radius exclusion zone around the site hinder accurate characterisation of nocturnal atmospheric mixing conditions using conventional meteorological techniques, so a radon-based scheme is trialled. When the nocturnal boundary layer is very stable, the Pasquill-Gifford "radiation" scheme overestimates the atmosphere's capacity to dilute pollutants with near-surface sources (such as tritiated water vapour) by 20% compared to the radon-based scheme. Under these conditions, near-surface wind speeds drop well below 1 m s(-1) and nocturnal mixing depths vary from ∼ 25 m to less than 10 m above ground level (a.g.l.). Combining nocturnal radon with daytime ceilometer data, we were able to reconstruct the full diurnal cycle of mixing depths. Average daytime mixing depths at this flat inland site range from 1200 to 1800 m a.g.l. in summer, and 500-900 m a.g.l. in winter. Using tower observations to constrain the nocturnal radon-derived effective mixing depth, we were able to estimate the seasonal range in the Bucharest regional radon flux as: 12 mBq m(-2) s(-1) in winter to 14 mBq m(-2) s(-1) in summer.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atmósfera / Monitoreo de Radiación / Radón / Contaminantes Radiactivos del Aire País/Región como asunto: Europa Idioma: En Revista: J Environ Radioact Asunto de la revista: SAUDE AMBIENTAL Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atmósfera / Monitoreo de Radiación / Radón / Contaminantes Radiactivos del Aire País/Región como asunto: Europa Idioma: En Revista: J Environ Radioact Asunto de la revista: SAUDE AMBIENTAL Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido