Chernobyl radioactive particles found to be unexpectedly stable after 40 years

Researchers from Leibniz University Hannover and the Helmholtz-Zentrum Dresden-Rossendorf have discovered that microscopic radioactive particles from the 1986 Chernobyl disaster remain unexpectedly stable four decades later. The study, published in the Journal of Hazardous Materials, analyzed six “hot particles” measuring between 8 and 50 micrometers.

The findings reveal three distinct classes of these particles: those chemically similar to uranium dioxide fuel, 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. Because they maintain their structural integrity despite environmental exposure, the research suggests they may continue to hold radioactive materials for the foreseeable future. This discovery allows for more precise assessments of the long-term health risks and environmental movement of radioactive dust in the contaminated exclusion zone.