Carbon-14 in the biosphere: Modelling and supporting research for the Canadian nuclear fuel waste management program

Sheppard, Stephen; Amiro, B.D.; Sheppard, Marsha I.; Stephenson, M.J.; Zach, Reto; Bird, Graham

doi:10.1016/0956-053x(94)90048-5

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…Because 14 C transfer in the environment is based on the principle of equilibrium, plants and air should have the same average carbon specific activity (Scott et al, 1991;Sheppard et al, 1994;RousselDebet et al, 2006). Table 3 shows that the best correlations between atmospheric CO 2 and plant 14 C activity data (taken from Dias et al, 2008) are found for samples placed NE (in both years) and N (only in 2005) of the power plants (Table 3).…”

Section: Gaussian Dispersion Modelmentioning

confidence: 98%

14CO2 dispersion around two PWR nuclear power plants in Brazil

Stenström

Leao

Santos³

et al. 2009

Journal of Environmental Radioactivity

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Section: Gaussian Dispersion Modelmentioning

confidence: 98%

14CO2 dispersion around two PWR nuclear power plants in Brazil

Stenström

Leao

Santos³

et al. 2009

Journal of Environmental Radioactivity

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“…As to the chemistry of selenium in plants, it is known that some plants can transform selenium into several organic compounds (Fergusson 1990). When selenite is supplied, it is rapidly converted to a selenomethionine-like organic form that is easily volatilised, whereas selenate is very slowly metabolised to organic forms (Sheppard and Sheppard 2008). As noted by Shaw et al (2005), in non-tolerant plants, sulfate and selenate do not appear to be distinguished by the plant, which leads to the synthesis of selenium analogues of the sulfurcontaining amino acids, selenomethionine and selenocysteine.…”

Section: Uptake Of Se-79 By Plantsmentioning

confidence: 99%

A mathematical model for the behaviour of Se-79 in soils and plants that takes account of seasonal variations in soil hydrology

Pérez-Sánchez

Thorne²,

Limer³

2012

J. Radiol. Prot.

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Se-79 is a long-lived radionuclide of potential radiological significance in relation to the deep geological disposal of solid radioactive wastes. In the context of release to the terrestrial environment, its main radiological impact is delivered through food chain pathways. Therefore, its accumulation in soils and uptake by plants is an important consideration in post-closure safety assessment studies. However, representation of its behaviour in the soil-plant system requires consideration of the multiple valence states that it can exhibit under different redox conditions and its susceptibility to volatilisation. A simple model is described that includes seasonal variations in soil hydrology and their effects on the mobility and root uptake of Se-79. Illustrative calculations are undertaken with the model, to demonstrate its capabilities for interpreting experimental data on the behaviour of Se-79 in soils and plants, and for making projections on the long-term behaviour of Se-79 transported to soils.

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“…: Le Dizès, 2004;IAEA, 2001IAEA, , 1985IAEA, , 1982Sheppard et al, 1994;OMS, 1987) rely on this basic assumption, expressed as:…”

Section: Modelling Principlesmentioning

confidence: 99%

Evaluation of¹⁴C doses since the end of the 1950s in metropolitan France

Roussel-Debet¹

2007

Radioprotection

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The dosimetric consequences of 14 C dissemination resulting from the radioactive fall-out of atmospheric nuclear-weapons testing conducted in the 50s have been estimated. Owing to the lack of 14 C measurements in food consumed in France over the past 60 years, this evaluation is based on the standard modelling of the isotopic equilibrium: it is assumed that the specific activity ( 14 C/C) of living plants is in equilibrium with that of CO 2 in the air. It is also considered that this isotopic ratio remains constant in animals and their production. The specific activities of 14 C in the biosphere were drawn from reference publications. Since the 1950s, the effective dose for adults has risen from 12.1 µSv y -1 to a maximum of about 22.3 µSv y -1 in 1964, before falling to 12.9 µSv y -1 , which is slightly higher than the initial value. The excess dose due to atmospheric testing reached about 10 µSv y -1 in the sixties. The generation of 1940 was exposed to the highest dose: 190 µSv in 60 years due to nuclear-weapons testing, which remains low in relation to natural exposure. Article published by EDP Sciences and available at http://www.edpsciences.org/radiopro or http://dx

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Carbon-14 in the biosphere: Modelling and supporting research for the Canadian nuclear fuel waste management program

Cited by 14 publications

References 16 publications

14CO2 dispersion around two PWR nuclear power plants in Brazil

14CO2 dispersion around two PWR nuclear power plants in Brazil

A mathematical model for the behaviour of Se-79 in soils and plants that takes account of seasonal variations in soil hydrology

Evaluation of¹⁴C doses since the end of the 1950s in metropolitan France

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Carbon-14 in the biosphere: Modelling and supporting research for the Canadian nuclear fuel waste management program

Cited by 14 publications

References 16 publications

14CO2 dispersion around two PWR nuclear power plants in Brazil

14CO2 dispersion around two PWR nuclear power plants in Brazil

A mathematical model for the behaviour of Se-79 in soils and plants that takes account of seasonal variations in soil hydrology

Evaluation of14C doses since the end of the 1950s in metropolitan France

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Evaluation of¹⁴C doses since the end of the 1950s in metropolitan France