Uncertainties in the use of concentration ratios for modelling NORM waste sites

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Uncertainties in the use of concentration ratios for modelling NORM waste sites. / Kaasik, Marko; Mora, Juan-Carlos; Vives i Batlle, Jordi; Vanhoudt, Nathalie; Tkaczyk, Alan.

In: Journal of environmental radioactivity, Vol. 222, 106315, 10.2020.

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Kaasik, Marko ; Mora, Juan-Carlos ; Vives i Batlle, Jordi ; Vanhoudt, Nathalie ; Tkaczyk, Alan. / Uncertainties in the use of concentration ratios for modelling NORM waste sites. In: Journal of environmental radioactivity. 2020 ; Vol. 222.

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@article{1858d9a8787d4e318af73bd853493808,
title = "Uncertainties in the use of concentration ratios for modelling NORM waste sites",
abstract = "The activity concentrations of 238U, 226Ra and 210Pb were modelled in Pinus sylvestris (Scots pine trees) on a uniform CaF2 sludge heap in Belgium. The aim of this work is to enhance the knowledge of how transfer factors behave in NORM landfills. The simplest possible model in radioecology is used, which is based on Concentration Ratios (CR-s) measured in equilibrium and activity concentrations of the above-mentioned radionuclides measured in the substrate where pine trees grow. Two alternative CR-s were used: (1) international CR compilations by the IAEA (2014) and (2) CR-s specifically determined for pine trees studied in British Columbia (Mahon and Mathews, 1983). Both CR-s were applied assuming lognormal distributions fitted from data reported in the literature. The results were compared with activity concentrations measured in trees sampled on-site. Modelled concentrations match the measured ones best in the case of 238U. For the studied NORM waste site, the approach using generic IAEA concentration ratios does not fulfill the conservatism requirement in the cases of 238U and 226Ra, as the concentration of radionuclides in trees is underestimated. On the other hand, the ratios from Mahon and Mathews, (1983) produce wide distributions, ensuring conservatism due to larger CR-s. The measured concentrations are narrowly distributed in general, which can be expected on a small sampling site on a uniform substrate. The generic approach outlined here is practical but, as a result of the uniqueness of the site considered, should be applied cautiously in other NORM situations.",
keywords = "Naturally occurring radioactive material, NORM, Calcium fluoride, Radionuclides, Radioecological model, Soil, Pine tree",
author = "Marko Kaasik and Juan-Carlos Mora and {Vives i Batlle}, Jordi and Nathalie Vanhoudt and Alan Tkaczyk",
note = "Score=10",
year = "2020",
month = oct,
doi = "10.1016/j.jenvrad.2020.106315",
language = "English",
volume = "222",
journal = "Journal of environmental radioactivity",
issn = "0265-931X",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Uncertainties in the use of concentration ratios for modelling NORM waste sites

AU - Kaasik, Marko

AU - Mora, Juan-Carlos

AU - Vives i Batlle, Jordi

AU - Vanhoudt, Nathalie

AU - Tkaczyk, Alan

N1 - Score=10

PY - 2020/10

Y1 - 2020/10

N2 - The activity concentrations of 238U, 226Ra and 210Pb were modelled in Pinus sylvestris (Scots pine trees) on a uniform CaF2 sludge heap in Belgium. The aim of this work is to enhance the knowledge of how transfer factors behave in NORM landfills. The simplest possible model in radioecology is used, which is based on Concentration Ratios (CR-s) measured in equilibrium and activity concentrations of the above-mentioned radionuclides measured in the substrate where pine trees grow. Two alternative CR-s were used: (1) international CR compilations by the IAEA (2014) and (2) CR-s specifically determined for pine trees studied in British Columbia (Mahon and Mathews, 1983). Both CR-s were applied assuming lognormal distributions fitted from data reported in the literature. The results were compared with activity concentrations measured in trees sampled on-site. Modelled concentrations match the measured ones best in the case of 238U. For the studied NORM waste site, the approach using generic IAEA concentration ratios does not fulfill the conservatism requirement in the cases of 238U and 226Ra, as the concentration of radionuclides in trees is underestimated. On the other hand, the ratios from Mahon and Mathews, (1983) produce wide distributions, ensuring conservatism due to larger CR-s. The measured concentrations are narrowly distributed in general, which can be expected on a small sampling site on a uniform substrate. The generic approach outlined here is practical but, as a result of the uniqueness of the site considered, should be applied cautiously in other NORM situations.

AB - The activity concentrations of 238U, 226Ra and 210Pb were modelled in Pinus sylvestris (Scots pine trees) on a uniform CaF2 sludge heap in Belgium. The aim of this work is to enhance the knowledge of how transfer factors behave in NORM landfills. The simplest possible model in radioecology is used, which is based on Concentration Ratios (CR-s) measured in equilibrium and activity concentrations of the above-mentioned radionuclides measured in the substrate where pine trees grow. Two alternative CR-s were used: (1) international CR compilations by the IAEA (2014) and (2) CR-s specifically determined for pine trees studied in British Columbia (Mahon and Mathews, 1983). Both CR-s were applied assuming lognormal distributions fitted from data reported in the literature. The results were compared with activity concentrations measured in trees sampled on-site. Modelled concentrations match the measured ones best in the case of 238U. For the studied NORM waste site, the approach using generic IAEA concentration ratios does not fulfill the conservatism requirement in the cases of 238U and 226Ra, as the concentration of radionuclides in trees is underestimated. On the other hand, the ratios from Mahon and Mathews, (1983) produce wide distributions, ensuring conservatism due to larger CR-s. The measured concentrations are narrowly distributed in general, which can be expected on a small sampling site on a uniform substrate. The generic approach outlined here is practical but, as a result of the uniqueness of the site considered, should be applied cautiously in other NORM situations.

KW - Naturally occurring radioactive material

KW - NORM

KW - Calcium fluoride

KW - Radionuclides

KW - Radioecological model

KW - Soil

KW - Pine tree

UR - https://ecm.sckcen.be/OTCS/llisapi.dll?func=ll&objId=43079766&objAction=download

U2 - 10.1016/j.jenvrad.2020.106315

DO - 10.1016/j.jenvrad.2020.106315

M3 - Article

VL - 222

JO - Journal of environmental radioactivity

JF - Journal of environmental radioactivity

SN - 0265-931X

M1 - 106315

ER -

ID: 7089449