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Accumulation of radionuclides from radioactive substrata by some…
Accumulation of radionuclides from radioactive substrata by some micromycetes
Background
Radioactive contamination from Chernobyl NPP and nuclear testing
"hot particles"
Long-term environmental contamination
Low solubility
Micromycetes break down hot particles
Some grow toward particles
Methods
Collected samples of radioactive agglomerates from Chernobyl NPP and nuclear weapons testing sites
Tested 5 species/8 strains of fungi
Examined:
Fungal directional growth
Ability of fungi to overgrow/dissolve radioactive agglomerates
Whether radionuclides were absorbed
Accumulation of Cs-137 and Eu-152
Intact vs. milled particles
Results
Grew toward radioactive particles
Overgrew and dissolved over time
Fungi accumulated radionuclides
Accumulated more europium than cesium
Europium and cesium were similar in milled particles
Key factors that contributed to accumulation
Fungal species
Particle size
Larger or intact particles were seen to have higher europium accumulation
Smaller or milled particles were similar for both. Not selective
Particle composition