Uncertainty assessment method for the Cs-137 fallout inventory and penetration depth

Papadakos, Georgios; Karangelos, D.J.; Petropoulos, N.P.; Anagnostakis, M.J.; Hinis, E.P.; Simopoulos, S.E.

doi:10.1016/j.jenvrad.2017.02.009

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…Other microorganisms might also have contributed to the structural changes of SRE‐treated samples. There are reports that bacteria and their metabolites can improve soil stability by enhancing particle‐to‐particle adhesion and affect water retention and reduce soil water diffusivity by blocking smaller pores and altering the surface tension of the water (Benard et al, 2017; Choudhury et al, 2018; Or, Phutane, & Dechesne, 2007; Papadakos et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Physical properties of a sandy soil as affected by incubation with a synthetic root exudate: Strength, thermal and hydraulic conductivity, and evaporation

Zhang

Gao

Whalley

et al. 2020

European J Soil Science

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Plant roots release various organic materials that may modify soil structure and affect heat and mass transfer processes. The objective of this study was to determine the effects of a synthetic root exudate (SRE) on penetrometer resistance (PR), thermal conductivity (λ), hydraulic conductivity (k) and evaporation of water in a sandy soil. Soil samples, mixed with either distilled water or the SRE, were packed into columns at a designated bulk density and water content, and incubated for 7 days at 18°C. Soil PR, λ, k and evaporation rate were monitored during drying processes. Compared with those incubated with water, samples incubated with SRE had visible hyphae, greater PR (0.7–5.5 MPa in the water content range of 0.11 to 0.22 m3 m−3) and λ (0.2–0.7 W m−1 K−1 from 0.05 to 0.22 m3 m−3), and increased k in the wet region but decreased k in the dry region. SRE treatment also reduced the overall soil water evaporation rate and cumulative water loss. Analysis of X‐ray computed tomography (CT) scanning showed that the SRE‐treated samples had a greater proportion of small pores (<60 μm). These changes were attributed mainly to SRE‐stimulated microbial activities. Highlights The effects of incubating a sandy soil with a synthetic root exudate (SRE) on soil physical properties and evaporation are examined. SRE incubation increased the fraction of small pores. SRE incubation increased soil penetrometer resistance and thermal conductivity. Soil hydraulic conductivity was increased in the wet region but was reduced in the dry region. SRE incubation reduced the overall evaporation rate and cumulative water loss.

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Section: Discussionmentioning

confidence: 99%

Physical properties of a sandy soil as affected by incubation with a synthetic root exudate: Strength, thermal and hydraulic conductivity, and evaporation

Zhang

Gao

Whalley

et al. 2020

European J Soil Science

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“…A semivariogram is a graphical representation of the spatial variability in a given set of data [53,54]. Analysis using a semivariogram could even provide a complete uncertainty budget, based on a type A estimation, for measurements where the spatial variation of the results is the prevailing parameter [55].…”

Section: Surface Temperature Measurement Using a Thermal Cameramentioning

confidence: 99%

Managing the uncertainty of the U-value measurement using an auxiliary set along with a thermal camera

Papadakos

Marinakis

Konstas

et al. 2021

Energy and Buildings

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“…In this case however, definitional uncertainty, which in paragraph 2.27 of ISO VIM [37] is defined as "component of measurement uncertainty resulting from the finite amount of detail in the definition of a measurand", should be considered. In cases of in situ measurements, not the analysis of samples under strict laboratory conditions, definitional uncertainty can be significant [38]. For reasons analyzed above, the question arises as to whether the ACI can fulfill the purpose of assessing the individual's exposure, even if the question is restricted to indoor external exposure to gamma radiation emitted by building materials.…”

Section: Introductionmentioning

confidence: 99%

Activity Concentration Index Values for Concrete Multistory Residences in Greece Due to Fly Ash Addition in Cement

Gavela,

Papadakos

2023

Eng

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According to 2013/59/Euratom Directive, the activity concentration index (ACI) is required to be estimated for each building material that is of concern from a radiation protection point of view. This index applies to building materials and not to constituents that cannot be used as building materials themselves. Fly ash is a byproduct of coal-fired power plants and is one of the main constituents of cement. The radioactivity in fly ash that is produced by Greek lignite power plants cannot be considered insignificant. For example, in the case of the Megalopolis power plant, the concentration for radioisotopes of the 226Ra chain is found to be about 1 kBq/kg. Since natural radionuclide concentrations, which are harmful to human health in terms of radiation exposure, exist in fly ash, ACI should be assessed for building materials containing fly ash. The present study evaluates the ACI of concrete containing fly ash cement when used in multistory residential buildings. Results showed that cement produced in Greece by the three main Greek cement production plants, containing lignite fly ash, and used as a material for concrete multistory constructions, should not be considered as “of concern from a radiation protection point of view”. Each country that wishes to evaluate the use of fly ash into constructions should repeat the method for the ACI uncertainty budget proposed in this study, to assess whether it significantly exceeds the reference value (whether it is of concern from a radiation protection point of view).

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Uncertainty assessment method for the Cs-137 fallout inventory and penetration depth

Cited by 7 publications

References 13 publications

Physical properties of a sandy soil as affected by incubation with a synthetic root exudate: Strength, thermal and hydraulic conductivity, and evaporation

Physical properties of a sandy soil as affected by incubation with a synthetic root exudate: Strength, thermal and hydraulic conductivity, and evaporation

Managing the uncertainty of the U-value measurement using an auxiliary set along with a thermal camera

Activity Concentration Index Values for Concrete Multistory Residences in Greece Due to Fly Ash Addition in Cement

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