Effects of radionuclide and rainfall characteristics on field loss parameters of grass

Autor: M.-A. Gonze, L. Garcia-Sanchez, C. Madoz-Escande
Přispěvatelé: Laboratoire de Modélisation Environnementale (DEI/SECRE/LME), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Radioécologie et d'Ecotoxicologie (DEI/SECRE/LRE)
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Radioactive Fallout
plant tissue
010504 meteorology & atmospheric sciences
Health
Toxicology and Mutagenesis
Rain
Field loss
Cesium
010501 environmental sciences
01 natural sciences
deposition
radionuclide migration
Models
tellurium
Barium Radioisotopes
Waste Management and Disposal
media_common
Time course
maximum likelihood analysis
environmental impact assessment
vegetation dynamics
Grass
article
Barium
General Medicine
Vegetation
Contamination
Pollution
radioactive contamination
strontium isotope
Non-parametric boostrap
Deposition (aerosol physics)
Cesium Radioisotopes
[SDE]Environmental Sciences
Strontium Radioisotopes
Radioactive Pollutants
media_common.quotation_subject
Rainfall condition
rainfall
chemistry.chemical_element
Soil science
Chemical
Poaceae
Loss model
Tellurium compounds
vegetation
cesium isotope
Parameter estimation
Environmental Chemistry
controlled study
Rainfall intensity
0105 earth and related environmental sciences
Hydrology
Edible tissue
Radioisotopes
Radionuclide
Strontium
nonhuman
cesium 137
cesium 134
Rainfall characteristics
Maximum likelihood estimation
strontium 85
Plant Leaves
Kinetics
chemistry
Models
Chemical
13. Climate action
Maximum likelihood methods
Foliar contamination
Radiological assessment
Environmental science
grassland
numerical model
Intensity (heat transfer)
Zdroj: Journal of Environmental Radioactivity
Journal of Environmental Radioactivity, Elsevier, 2009, 100 (10), pp.847-853. ⟨10.1016/j.jenvrad.2009.06.013⟩
ISSN: 0265-931X
1879-1700
DOI: 10.1016/j.jenvrad.2009.06.013⟩
Popis: The decrease of foliar activity in vegetation after its initial contamination by foliar deposition is termed "field loss" (Chamberlain, 1970). This work investigated further laboratory data concerning field loss of 134Cs, 137Cs, 85Sr, 133Ba and 123mTe deposited on grassland (Madoz-Escande et al., 2005). Treatments consisted in rainfall scenarios cumulating 14 mm per week, combining two levels of intensity (8 or 30 mm/h) and two levels of frequency/precocity (late once or early twice-a-week). The time course of field loss was monitored in the edible tissues which were sampled by mowing between the rainfalls. Data were analyzed with an offset exponential loss model which is applicable to chronic contamination and is consistent with approaches adopted in radiological assessment models. Its parameters were estimated by the maximum-likelihood method, and their accuracy was determined by nonparametric boostrap. Radionuclide and rainfall conditions significantly affected the estimated rate (λ1) and extent (A1) of field loss. Field loss rate (λ1) and nonentrainable fraction (1 - A1) varied by a factor 1.5-3. Cesium was very mobile but persistent. On the contrary Tellerium was found less labile, but eventually was almost completely eliminated. Strontium and Barium had intermediate behaviors. Field loss was more efficient for moderate late once-a-week rainfalls (8 mm/h). Higher rainfall intensity reduced more the radionuclides losses than higher rainfall frequency/precocity. This paper reports statistically relevant effects that should be considered for more realistic assessments. © 2009 Elsevier Ltd. All rights reserved.
Databáze: OpenAIRE
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