OpenSSL SSL_connect: Connection reset by peer in connection to v2.sherpa.ac.uk:443 PuSH - Publication Server of Helmholtz Zentrum München: Dry deposition of gaseous radioiodine and particulate radiocaesium onto leafy vegetables.

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Tschiersch, J. ; Shinonaga, T. ; Heuberger, H.*

Dry deposition of gaseous radioiodine and particulate radiocaesium onto leafy vegetables.

Sci. Total Environ. 407, 5685-5693 (2009)
DOI PMC
Radionuclides released to the atmosphere during dry weather (e.g. after a nuclear accident) may contaminate vegetable foods and cause exposure to humans via the food chain. To obtain experimental data for an appropriate assessment of this exposure path, dry deposition of radionuclides to leafy vegetables was studied under homogeneous and controlled greenhouse conditions. Gaseous (131)I-tracer in predominant elemental form and particulate (134)Cs-tracer at about 1 mum diameter were used to identify susceptible vegetable species with regard to contamination by these radionuclides. The persistence was examined by washing the harvested product with water. The vegetables tested were spinach (Spinacia oleracea), butterhead lettuce (Lactuca sativa var. capitata), endive (Cichorium endivia), leaf lettuce (Lactuca sativa var. crispa), curly kale (Brassica oleracea convar. acephala) and white cabbage (Brassica oleracea convar. capitata). The variation of radionuclides deposited onto each vegetable was evaluated statistically using the non-parametric Kruskal-Wallis Test and the U-test of Mann-Whitney. Significant differences in deposited (131)I and (134)Cs activity concentration were found among the vegetable species. For (131)I, the deposition velocity to spinach normalized to the biomass of the vegetation was 0.5-0.9 cm(3) g(-1) s(-1) which was the highest among all species. The particulate (134)Cs deposition velocity of 0.09 cm(3) g(-1) s(-1) was the highest for curly kale, which has rough and structured leaves. The lowest deposition velocity was onto white cabbage: 0.02 cm(3) g(-1) s(-1) (iodine) and 0.003 cm(3) g(-1) s(-1) (caesium). For all species, the gaseous iodine deposition was significantly higher compared to the particulate caesium deposition. The deposition depends on the sensitive parameters leaf area, stomatal aperture, and plant morphology. Decontamination by washing with water was very limited for iodine but up to a factor of two for caesium.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Gaseous 131I; Particulate 134Cs; Leafy vegetable; Dry deposition; Sensetive parameter
ISSN (print) / ISBN 0048-9697
e-ISSN 1879-1026
Journal Science of the Total Environment, The
Quellenangaben Volume: 407, Issue: 21, Pages: 5685-5693 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place Amsterdam
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Radiation Protection (ISS)