Influence of rainfall characteristics on elimination of aerosols of cesium, strontium, barium and tellurium deposited on grassland

Autor: M. Morello, T. Bonhomme, C. Madoz-Escande, L. Garcia-Sanchez
Přispěvatelé: Laboratoire de Radioécologie et d'Ecotoxicologie (DEI/SECRE/LRE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Modélisation Environnementale (DEI/SECRE/LME)
Jazyk: angličtina
Rok vydání: 2005
Předmět:
Time Factors
aerosol
Health
Toxicology and Mutagenesis
Rain
[SDV]Life Sciences [q-bio]
Cesium
dew
runoff
010501 environmental sciences
01 natural sciences
tellurium
Barium Radioisotopes
Waste Management and Disposal
time
statistical significance
2. Zero hunger
quantitative analysis
article
Barium
General Medicine
Pollution
Soil contamination
Spectrometry
Gamma
Deposition (aerosol physics)
Cesium Radioisotopes
Strontium Radioisotopes
grass
rainfall
frequency analysis
chemistry.chemical_element
barium
010403 inorganic & nuclear chemistry
Poaceae
High intensity rainfall
mathematical analysis
Animal science
vegetation
dry deposition
greenhouse
Environmental Chemistry
controlled study
Gamma
Deposition
intermethod comparison
0105 earth and related environmental sciences
plant leaf
Hydrology
Aerosols
Radioisotopes
Radionuclide
Strontium
nonhuman
soil pollution
cesium 137
Spectrometry
statistical model
Greenhouses
15. Life on land
strontium 85
0104 chemical sciences
Aerosol
Total transfer factors (TTF)
leaching
chemistry
13. Climate action
Soil water
Environmental science
Soils
Dew
grassland
Zdroj: Journal of Environmental Radioactivity
Journal of Environmental Radioactivity, Elsevier, 2005, 84 (1), pp.1-20. ⟨10.1016/j.jenvrad.2005.03.006⟩
ISSN: 0265-931X
1879-1700
DOI: 10.1016/j.jenvrad.2005.03.006⟩
Popis: This work is aimed at quantifying foliar transfer of cesium, strontium, barium and tellurium under the influence of rainfall characteristics (intensity, frequency and time elapsed between contamination and first rainfall). Grassland boxes were contaminated by dry deposition of multi-element aerosols of 137Cs, 85Sr, 133Ba and 123mTe. They were grown in a greenhouse under controlled conditions. The treatments consisted of mowing and applying rainfalls (8 and 30 mm h-1) at different times after the contamination. At a leaf area index of 5.9 ± 1.9, interception of the aerosols was similar for the 4 radionuclides (83.8 ± 5.9%). Dew produced significant radionuclide accumulation in the base of the vegetation and transfer to the soil. For moderate intensity, an early (2 days after contamination) first rainfall was as efficient, in terms of leaf wash-off, as a longer rainfall occurring later (6 days after contamination). For early rainfalls, eliminated activities were comparable because the influence of rain intensity was compensated by rain duration. However, for late rainfalls, wash-off efficiency increased with rainfall intensity. Total transfer factors (TTF) were determined on whole grass immediately after 4 rainfalls and at harvest. After 4 medium intensity rainfalls, rain frequency did not influence total transfer factors (TTF) of strontium, barium and tellurium (about 0.2, 0.3 and 0.35 Bq kgfresh weight-1 by Bq m-2, respectively). Cesium TTF value was lower in the case of a weekly rain (0.1 against 0.2 Bq kgfresh weight-1 by Bq m-2). TTF values were similar for twice-a-week rainfalls, whatever their intensity. They were higher for weekly rains of high intensity (between 0.3 and 0.75 Bq kg fresh weight-1 by Bq m-2 against 0.1-0.35 Bq kgfresh weight-1 by Bq m-2, depending on the radionuclides). TTF values attested that wash-off was more efficient when rainfalls lasted longer. Field loss on the top of the leaves was well described by an offset exponential model. The half-lives varied with rainfall characteristics from 4 days for cesium, strontium and barium to 20 days for tellurium. The offset value varied between 0% for tellurium (high intensity rainfalls) and 14% for cesium (medium intensity rainfalls). © 2005 Elsevier Ltd. All rights reserved.
Databáze: OpenAIRE
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