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Chernobyl radioactive particle stability research

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2026-10-24 08:44 UTC → 2026-10-26 01:23 UTC · added ~~removed~~

Researchers from Leibniz University Hannover and Helmholtz-Zentrum Dresden-Rossendorf have conducted structural analyses of microscopic radioactive fragments from the Chernobyl disaster. By examining highly radioactive “hot particles” ranging from 8 to 50 micrometers in size using synchrotron X-ray diffraction, scientists discovered that the nuclear fuel structure has remained significantly more stable over the last 40 years than previously assumed. The study, published in the Journal of Hazardous Materials, identified three distinct classes of particles: those chemically similar to uranium dioxide, those encased in a durable zirconium layer formed during high-temperature melting, and those created when the graphite moderator ignited. These particles act as highly persistent reservoirs for fission products and actinides. This stability presents a dual-edged scenario for ecological safety. While the lack of dissolution has prevented large-scale contamination of groundwater and the Dnieper River basin, the material remains highly concentrated in fine dust just below the soil surface. The research indicates that the rate of leaching—the process by which radionuclides are released into water, soil, or living organisms—depends heavily on whether elements are weakly bound to mineral surfaces or encased in a highly resistant matrix influenced by acidity, humidity, temperature, and microbial activity. Recent findings emphasize that while some materials remain stable, others—specifically uranium oxides created by the graphite fire—are mechanically fragile. These oxides can break into microscopic fragments that are easily transported by wind, posing serious inhalation risks. Consequently, mechanical disturbances such as forest fires, military activity, or construction could resuspend these particles into the air, necessitating precise assessments of long-term health ~~risks and the continued use of protective clothing in affected areas.~~ risks.

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