Biogeochemical signatures in the lichen Hypogymnia physodes in the mid Urals.
J Environ Radioact
; 90(2): 151-62, 2006.
Article
en En
| MEDLINE
| ID: mdl-16887244
ABSTRACT
Multi-element content and uranium (U) isotopes were investigated in the lichen Hypogymnia physodes (native and transplants) sampled across a 60-km transect, centred on Karabash smelter town, from Turgoyak Lake (SW) to Kyshtym (NE) to investigate the origin of U. Kyshtym was the site of a major nuclear accident in 1957. (234)U/(238)U activity ratios in native thalli sampled during July 2001 were within the natural isotopic ratio in minerals. Uranium/thorium (U/Th) ratios were higher in native thalli towards the NE (average 0.73) than those in the SW (average 0.57). Element signatures in native thalli and transplants suggest U was derived from fossil fuel combustion from Karabash and sources lying further to the east. Systematic and significant U enrichment indicative of a nuclear fuel cycle source was not detected in any sample. Element signatures in epiphytic lichen transplants and native thalli provide a powerful method to evaluate U deposition.
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Base de datos:
MEDLINE
Asunto principal:
Monitoreo de Radiación
/
Uranio
/
Desastres
/
Líquenes
País/Región como asunto:
Asia
/
Europa
Idioma:
En
Revista:
J Environ Radioact
Asunto de la revista:
SAUDE AMBIENTAL
Año:
2006
Tipo del documento:
Article
País de afiliación:
Reino Unido