A page from the OpenDepot.org service

Jump to the start of the main contents

Brudenell, A.J.P. and Collins, C.D. and Shaw, G. (1997) Dynamics of tritiated water (HTO) uptake and loss by crops after short-term atmospheric release. Journal of Environmental Radioactivity, 36 (2-3). pp. 197-218. ISSN 0265931X

[img] PDF
Download (1341Kb)

    Abstract

    A knowledge of the dynamics of HTO in crops and soils is required to validate models, such as the UK Ministry of Agriculture, Fisheries and Food STAR-H3, which predict the ingestion dose following release of tritium. Deposition velocities to cabbage, lettuce and soil have been determined. The loss of HTO from cabbage is described by a double exponential decay; the faster component (t 1/2 53min) is attributed to vapour exchange and transpiration, and the slower component (t 1/2 15 h) to decontamination of stem and root tissues. Due to the long half-time (t 1/2) of the second component, the loss of the last 5% of the applied HTO would appear to be complete within 48 h. This represents a considerable increase over the 6-h loss period predicted by the current STAR-H3 model. As these components can now be resolvedfrom the above data, this may be a useful addition to the STAR-H3 model. Our data indicate that HTO loss predictions should be more pessimistic than the default STAR-H3 parameters allow. The effect of dark treatment on uptake and loss of HTO has been examined. Pooled data for soils are also well described using a double exponential, fit to the loss data. 1997 Elsevier Science Limited.

    Item Type: Article
    Additional Information: Abbreviations: HTO, tritiated water; OBT, organically bound tritium; HT, tritium gas; OM, organic matter; va, deposition velocity; I, half-time; %RH, percentage relative humidity; STAR-H3, short term atmospheric release of tritium; TFWT, tissue free-water tritium; PAR, photosynthetically active radiation; LAI, leaf area index; MAFF, Ministry of Agriculture, Fisheries and Food; UFOTRI, Unfallfolgenmmodel fur Tritumfreisetzangen (Major German model).
    Subjects: Biological Sciences > Biology > Environmental Biology
    Biological Sciences > Botany > Applied Botany
    Divisions: UNSPECIFIED
    Depositing User: Dr Alistair JP Brudenell
    Date Deposited: 13 Aug 2012 18:41
    Last Modified: 13 Aug 2012 18:41
    URI: http://opendepot.org/id/eprint/1327

    Actions (login required)

    View Item