Sources and variation of isotopic ratio of airborne radionuclides in Western Arctic lichens and mosses

Autor: Anna Cwanek, Jerzy W. Mietelski, Maria Olech, R. Misiak, Edyta Łokas, Robert Anczkiewicz
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Radioactive Fallout
lichens and mosses
Canada
Water Pollutants
Radioactive
Environmental Engineering
Lichens
Health
Toxicology and Mutagenesis
0208 environmental biotechnology
chemistry.chemical_element
Bryophyta
02 engineering and technology
010501 environmental sciences
Fukushima fallout
01 natural sciences
Radiation Monitoring
Radioactive contamination
Fukushima Nuclear Accident
Soil Pollutants
Radioactive
Environmental Chemistry
global fallout
Lichen
0105 earth and related environmental sciences
Canadian Arctic
Radionuclide
Arctic Regions
Thorium
Public Health
Environmental and Occupational Health
General Medicine
General Chemistry
Uranium
Pollution
radioactive contamination
Plutonium
Tundra
020801 environmental engineering
Isotopic ratio
chemistry
Arctic
Air Pollutants
Radioactive
Cesium Radioisotopes
Environmental chemistry
Environmental science
Alaska
Popis: This research concerned radioactivity of lichens and mosses from coastal zones of the Canadian Arctic and Alaska. Over 50 samples were collected from 7 positions during two scientific expeditions in 2012 and 2013. The tundra contamination caused by anthropogenic radionuclides was relatively low, reaching mean values with SD's of: 17.4 ± 3.5 Bq/kg for 90Sr, 14.0 ± 2.9 Bq/kg for 134Cs, 38.4 ± 7.5 Bq/kg for 137Cs, 0.86 ± 0.24 Bq/kg for 239+240Pu, 0.065 ± 0.017 Bq/kg for 238Pu and 0.50 ± 0.13 Bq/kg for 241Am. The increase of activity concentration with increasing latitudes was noticed mostly in regard to 90Sr, Pu isotopes and 241Am. The analysis of isotopic ratios exhibited dominant contribution of the global fallout (+SNAP 9A satellite re-entry fallout) for the presence of plutonium isotopes and 241Am. The Fukushima fallout signature was identified in a few lichens from Alaska. However, the influence of additional unknown factor on the occurrence of 90Sr and 137Cs has been detected in western part of Canadian Arctic. Natural radioisotopes of thorium and uranium were found throughout the entire investigated region and the average values of activity concentration with SD's were as follows: 2.92 ± 0.47 Bq/kg for 230Th, 2.61 ± 0.48 Bq/kg for 232Th, 4.32 ± 0.80 Bq/kg for 234U and 3.97 ± 0.71 Bq/kg for 238U. Examined Western Arctic tundra was not affected with any technically enhanced natural radioactivity.
Databáze: OpenAIRE
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