Modelling radionuclide distribution and transport in the environment

Thiessen, Kathleen M; Thorne, M C; Maul, P.R.; Pröhl, G.; Wheater, H. S.

doi:10.1016/s0269-7491(99)00090-1

Cited by 73 publications

(48 citation statements)

References 62 publications

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“…Yanagisawa and Muramatsu (1993) and Yanagisawa and Muramatsu (1997) reported similar findings for a range of vegetable crops. This concurs with other reports that activity is considerably less in storage organs and reproductive parts than in vegetative parts (Bell et al, 1988;Dehut et al, 1989;Murphy and Johnson, 1993;Thiessen et al, 1999). Many studies have reported that Tc is readily translocated to above ground plant parts in annuals (Mousny et al, 1979;Cataldo et al, 1989;Dehut et al, 1989;Degenkolb et al, 1994;Woodard-Blankenship et al, 1995).…”

Section: The Dynamics Of Soil To Plant Transfer 99supporting

confidence: 92%

“…The TF is applied in many current assessment models of Tc behaviour in the environment Thiessen et al, 1999). A variety of studies have shown that, until toxicity, Tc concentration in leaves tends to increase linearly with respect to supplied concentration, i.e.…”

Section: Soil To Plant Transfer Factors For Tcmentioning

confidence: 99%

“…A variety of studies have shown that, until toxicity, Tc concentration in leaves tends to increase linearly with respect to supplied concentration, i.e. TF is independent of concentration (Lembrechts and Desmet, 1984;Van Loon and Lembrechts, 1984;Murphy and Johnson, 1993;Yanagisawa and Muramatsu, 1993;Thiessen et al, 1999). TFs for 99 Tc have been reported to span three orders of magnitude from 1-1000 (Echevarria et al, 1997).…”

Section: Soil To Plant Transfer Factors For Tcmentioning

confidence: 99%

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Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Bennett

Willey

2003

Journal of Environmental Radioactivity

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Section: The Dynamics Of Soil To Plant Transfer 99supporting

confidence: 92%

Section: Soil To Plant Transfer Factors For Tcmentioning

confidence: 99%

Section: Soil To Plant Transfer Factors For Tcmentioning

confidence: 99%

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Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Bennett

Willey

2003

Journal of Environmental Radioactivity

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“…But assessments of radioiodine exposure incorporate large uncertainties (2,3) because iodine environmental behavior is not well understood (4,5,6). In the Earth near-surface, iodine exists in multiple oxidation states ranging from −1 to þ5, which form inorganic (e.g., iodide, I − , and iodate, IO 3 − ) and organic (e.g., CH 3 I) species in gaseous (e.g., iodine, I 2 ), particle-reactive or soluble phases, all with widely divergent chemical behaviors (7) and facile interconversions.…”

mentioning

confidence: 99%

Surficial redistribution of fallout¹³¹iodine in a small temperate catchment

Landis

Hamm²,

Renshaw³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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Isotopes of iodine play significant environmental roles, including a limiting micronutrient ( 127 I), an acute radiotoxin ( 131 I), and a geochemical tracer ( 129 I). But the cycling of iodine through terrestrial ecosystems is poorly understood, due to its complex environmental chemistry and low natural abundance. To better understand iodine transport and fate in a terrestrial ecosystem, we traced fallout 131 iodine throughout a small temperate catchment following contamination by the 11 March 2011 failure of the Fukushima Daiichi nuclear power facility. We find that radioiodine fallout is actively and efficiently scavenged by the soil system, where it is continuously focused to surface soils over a period of weeks following deposition. Mobilization of historic (pre-Fukushima) 137 cesium observed concurrently in these soils suggests that the focusing of iodine to surface soils may be biologically mediated. Atmospherically deposited iodine is subsequently redistributed from the soil system via fluvial processes in a manner analogous to that of the particle-reactive tracer 7 beryllium, a consequence of the radionuclides’ shared sorption affinity for fine, particulate organic matter. These processes of surficial redistribution create iodine hotspots in the terrestrial environment where fine, particulate organic matter accumulates, and in this manner regulate the delivery of iodine nutrients and toxins alike from small catchments to larger river systems, lakes and estuaries.

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“…When radionuclides enter through the cuticle layer, they are actively transported inside the plant cells through both the symplastic pathway and an exchange mechanism between the phloem and xylem i.e. vascular bundle system (Thiessen et al, 1999). The redistribution of radionuclides is regulated mainly by their physiological behavior within the crop and the time during the growing season when the deposition occurred (Thiessen et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Accumulation of wet-deposited radiocaesium and radiostrontium by spring oilseed rape (Brássica napus L.) and spring wheat (Tríticum aestívum L.)

Bengtsson¹,

Eriksson²,

Gärdenäs³

et al. 2013

Environmental Pollution

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Sr within different parts of spring oilseed rape and spring wheat plants was investigated, with a particular focus on transfer to seeds after artificial wet deposition at different growth stages during a two-year field trial. In general, the accumulation of radionuclides in plant parts increased when deposition was closer to harvest. The seed of spring oilseed rape had lower concentrations of 85 Sr than spring wheat grain. The plants accumulated more 134 Cs than 85 Sr. We conclude that radionuclides can be transferred into human food chain at all growing stages, especially at the later stages. The variation in transfer factors during the investigation, and in comparison to previous results, implies the estimation of the risks for possible transfer of radionuclides to seeds in the events of future fallout during a growing season is still subjected to considerable uncertainty..

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Modelling radionuclide distribution and transport in the environment

Cited by 73 publications

References 62 publications

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Surficial redistribution of fallout¹³¹iodine in a small temperate catchment

Accumulation of wet-deposited radiocaesium and radiostrontium by spring oilseed rape (Brássica napus L.) and spring wheat (Tríticum aestívum L.)

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Modelling radionuclide distribution and transport in the environment

Cited by 73 publications

References 62 publications

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Surficial redistribution of fallout131iodine in a small temperate catchment

Accumulation of wet-deposited radiocaesium and radiostrontium by spring oilseed rape (Brássica napus L.) and spring wheat (Tríticum aestívum L.)

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Surficial redistribution of fallout¹³¹iodine in a small temperate catchment