OBT/HTO ratio in agricultural produce subject to routine atmospheric releases of tritium

The mean expected value of the OBT/HTO ratio (i.e. generic ratio) is derived in this study on the joint basis of a long-term study conducted at Atomic Energy of Canada Limited (AECL)'s Chalk River Laboratories (CRL), model simulations targeted at filling gaps in a yet incomplete timeline of CRL...

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Vydané v:Journal of environmental radioactivity Ročník 129; s. 157 - 168
Hlavní autori: Korolevych, V.Y., Kim, S.B., Davis, P.A.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Kidlington Elsevier Ltd 01.03.2014
Elsevier
Predmet:
Agronomy. Soil science and plant productions
Air Pollutants, Radioactive - analysis
Animal, plant and microbial ecology
Applied ecology
Atmosphere
Biological and medical sciences
Canada
Crops, Agricultural - chemistry
cultivars
data collection
energy
Fundamental and applied biological sciences. Psychology
HTO
meteorology
Models, Theoretical
OBT
Radiation Monitoring
rivers
simulation models
Tritium
Tritium - analysis
Vegetation-atmosphere exchange
wind direction
Canada
OBT
Tritium
HTO
Vegetation-atmosphere exchange
Plant tissue
Radioactive pollution
Atmosphere
Vegetation
Tritiated water
Agricultural product
Radioactive contamination
Tritium Organic compounds
ISSN:0265-931X, 1879-1700, 1879-1700
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Shrnutí:The mean expected value of the OBT/HTO ratio (i.e. generic ratio) is derived in this study on the joint basis of a long-term study conducted at Atomic Energy of Canada Limited (AECL)'s Chalk River Laboratories (CRL), model simulations targeted at filling gaps in a yet incomplete timeline of CRL measurements and a reference dataset comprised of numerous experiments reported in the literature. Cultivar variability and disparity in site-specific settings are covered by the reference dataset. Dynamical variability caused by meteorology has been a specific target of the long-term experimental campaign at CRL, where the former two types of variability were eliminated. The distribution of OBT/HTO ratios observed at CRL appears to be a fairly good match to the distribution of OBT/HTO ratios from the literature. This implies that dynamical variability appears important in both cases. Dynamics of atmospheric HTO at CRL is comprised of a sequence of episodes of atmospheric HTO uptake and re-emission of plant HTO. The OBT/HTO ratio appears sensitive to the proportion of the duration of these two episodes: the lesser the frequency (and duration) of plume arrivals, the higher the expected mean OBT/HTO ratio. With the plume arrival frequency defined by the typical wind rose, one would encounter a mean OBT/HTO ratio close to 2. It is important to note that this number is seen both in the reference dataset, and in the continuous timeline of HTO and OBT reconstructed from CRL observations by dynamical interpolation (modelling). Many datasets (including that of CRL) targeted at the OBT/HTO ratio are biased high compared to the suggested number. This could be explained by scarce measurements of the low OBT/HTO ratios in the short phase of uptake of atmospheric HTO by the plant. •Observed OBT/HTO is similarly distributed in reference dataset and CRL dataset.•Modeled OBT/HTO provided auxiliary data used in derivation of generic ratio.•Generic OBT/HTO ratio is estimated to be equal to 2.0.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0265-931X
1879-1700
1879-1700
DOI:10.1016/j.jenvrad.2013.12.014