Observed and Modeled Tritium Concentrations in the Terrestrial Food Chain near a Continuous Atmospheric Source

Davis, Philip A.; Kim, S. B.; Chouhan, S.; Workman, W.J.G.

doi:10.13182/fst05-a976

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…Owing to the complexity of environmental metabolism, the investigations of tritium incorporation were divided into numerous themes including: the influence of HT releases (Amano et al, 1995), the formation and retention of tritium (deuterium could be used as analogue) at various growth stages, also taking into account the difference of metabolism between night and day (Atarashi-Andoh et al, 2002;Momoshima et al, 2006), its translocation to edible parts (Diabate and Strack, 1997). In addition, several papers also deal with modelling either to compare observed and predicted values (Davis et al, 2005;Keum et al, 2006;Ota et al, 2007) or for tritium dose estimates (DeVol and Powell, 2004;Hisamatsu et al, 1987;König, 1990). Taking advantage of tritium releases, several studies have investigated tritium distribution in various environmental samples to determine Tissue Free Water Tritium (TFWT) and NE-OBT activities and also the conversion factors (Vichot et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

A follow up of the decrease of non exchangeable organically bound tritium levels in the surroundings of a nuclear research center

Baglan

Alanic

Meignen

et al. 2011

Journal of Environmental Radioactivity

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Section: Introductionmentioning

confidence: 99%

A follow up of the decrease of non exchangeable organically bound tritium levels in the surroundings of a nuclear research center

Baglan

Alanic

Meignen

et al. 2011

Journal of Environmental Radioactivity

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“…The uncertainty and under estimates of OBT concentrations come from the equilibrium assumptions based on a long term average of HTO concentration in air. In real field conditions, there is no equilibrium as it was previously pointed out (IAEA, 2008a (Davis et al, 2005). Modelling attempts regarding these complex situations were reported (IAEA, 2008b) and emphasised in APPENDIX A "Model Performance as a Function of Air Concentration Averaging Time" of the same study (IAEA, 2008b).…”

Section: Uncertainty Of Obt/hto Ratios For Routine Releasesmentioning

confidence: 88%

“…On the other hand, residence times for OBT in plants are sufficiently long that concentrations in these compartments better reflect average air concentrations on longer intervals. Plant OBT/HTO ratios varied between 0.12 and 0.56, when monthly HTO air average at Pickering Nuclear Power Plant (NPP) (Canada) was used (Davis et al, 2005). Modelling attempts regarding these complex situations were reported (IAEA, 2008b) and emphasised in APPENDIX A "Model Performance as a Function of Air…”

Section: Uncertainty Of Obt/hto Ratios For Routine Releasesmentioning

confidence: 99%

Uncertainty of current understanding regarding OBT formation in plants

Melintescu

Galeriu

2017

Journal of Environmental Radioactivity

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Radiological impact models are important tools that support nuclear safety. For tritium, a special radionuclide that readily enters the life cycle, the processes involved in its transport into the environment are complex and inadequately understood. For example, tritiated water (HTO) enters plants by leaf and root uptake and is converted to organically bound tritium (OBT) in exchangeable and non-exchangeable forms; however, the observed OBT/HTO ratios in crops exhibit large variability and contradict the current models for routine releases.Non-routine or spike releases of tritium further complicate the prediction of OBT formation.The experimental data for a short and intense atmospheric contamination of wheat are presented together with various models' predictions. The experimental data on wheat demonstrate that the OBT formation is a long process, it is dependent on receptor location and stack dynamics, there are differences between night and day releases, and the HTO dynamics in leaf and ear is a very important contributor to OBT formation.

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“…Additional parameter values came from site-specific data. The tritium and C-14 models of N288.1 have been validated with experimental data [4,5]. TRS-472, "Handbook of parameter values for the prediction of radionuclide transfer in terrestrial and freshwater environments", which superseded TRS-364, is intended to provide conservative parameter values for screening, and considers the same environmental compartments as N288.1.…”

Section: Introductionmentioning

confidence: 99%

Comparison of transfer parameters in TRS-472 and Canadian standard CSA N288.1 and doses predicted using them

2011

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Abstract. We compared parameter values and models in N288.1 and TRS-472 and the doses predicted using them. The parameter values and models for tritium and C-14 are similar. For other radionuclides, the parameter values agree well for soil to plant transfer, and forage to animal products transfer. Agreement is not always good for the translocation factor (for which N288.1 is often more conservative) and for soil and sediment K d and freshwater fish BAFs (for which N288.1 is often less conservative). Using parameter values from N288.1 rather than using those from TRS-472 results in higher doses for 8 of 9 radionuclides for airborne releases, and for 5 of 9 radionuclides for aquatic releases. For airborne releases, the maximum difference occurs for I-131, where using N288.1 parameter values results in doses being seven times higher. For aquatic releases, the difference reaches a factor of 194 for Co-60, with the use of N288

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Observed and Modeled Tritium Concentrations in the Terrestrial Food Chain near a Continuous Atmospheric Source

Cited by 11 publications

References 5 publications

A follow up of the decrease of non exchangeable organically bound tritium levels in the surroundings of a nuclear research center

A follow up of the decrease of non exchangeable organically bound tritium levels in the surroundings of a nuclear research center

Uncertainty of current understanding regarding OBT formation in plants

Comparison of transfer parameters in TRS-472 and Canadian standard CSA N288.1 and doses predicted using them

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