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Researchers who examined six radioactive fragments from the Chernobyl disaster found that the nuclear fuel’s crystal structure had remained largely intact four decades after the 1986 accident. The result suggests these particles may retain radioactive fission products, but the small sample cannot establish how common this stability is or change health-risk assessments for the region.
Researchers from Leibniz University Hannover and the Helmholtz-Zentrum Dresden-Rossendorf found that the nuclear fuel structure in six radioactive particles from the 1986 Chernobyl disaster had remained largely intact after about 40 years. The study, published in the Journal of Hazardous Materials, suggests the particles may hold radioactive fission products within them, but the small sample does not establish how representative the finding is or alter safety restrictions.
The fragments, known as hot particles, measured between 8 and 50 micrometers and came from two locations in Ukraine. Researchers isolated them from soil, secured them to tungsten electrodes and transported them to the Rossendorf Beamline in Grenoble for analysis. The study reports a first structural investigation of this kind on individual highly radioactive fragments.
Using synchrotron X-ray diffraction, the team recorded each particle from about 2,000 angles to map its internal crystal phases. They detected different uranium oxide phases and found that the fuel’s crystal structure in the examined particles was largely preserved. The researchers interpret this as evidence that those particles are chemically more stable than previously assumed, and that they retain fission products within their structure.
The paper is titled “X-ray diffraction phase analysis of single hot particles from Chornobyl” and was published in 2026 in the Journal of Hazardous Materials. Its authors include Tobias Weissenborn and Christoph Hennig. The reported experiment covered only six particles from two sites; it did not measure the risk to people or determine how quickly all particles across the affected region release radioactive substances.
What Particle Stability Could Mean
The findings may help researchers improve estimates of how radioactive material moves from accident debris into surrounding soil and water. If some particles keep fission products contained, their release behavior may differ from that of more fragile material. That distinction matters to models of environmental contamination and the potential exposure pathways for people who enter affected areas.
But stable structure does not mean harmlessness. The particles remain highly radioactive, and the study did not establish that retaining radionuclides eliminates exposure risk. Nor did it assess actual health outcomes or show that environmental contamination has declined. The result is a new piece of evidence about a small number of particles, not a basis for changing access rules or generalizing to the entire exclusion zone.
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Three Types of Chernobyl Hot Particles
The 1986 reactor accident scattered debris and radioactive dust around the site. Researchers distinguish three broad particle types: fragments similar to uranium dioxide fuel; particles partly or fully coated in, or fused with, zirconium; and particles formed after the reactor’s graphite moderator caught fire. The fire burned for 10 days, and the heat and oxidation produced different uranium oxides.
Some oxidized compounds, including U₃O₈, can form mechanically unstable microscopic particles that are readily carried by wind. Inhaling radioactive dust can pose serious health risks. The new work addresses a longstanding research problem: particles weather at different rates, and their internal structure may affect how they release radioactive substances over time.
Studying individual fragments is technically difficult because they are tiny and intensely radioactive. The team used confinement layers for transport and developed a method to rotate each particle in a focused X-ray beam. The resulting phase analysis identifies crystal structures; it is not a region-wide survey of particle abundance or a direct measurement of human exposure.
“Every single particle has a different structure.”
— Tobias Weissenborn, physicist and doctoral candidate at Leibniz University Hannover
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Limits of the Six-Particle Sample
The central limitation is the sample size: only six particles from two locations were analyzed. Researchers say particles differ in structure, and samples from more locations and in much greater numbers are needed to assess how widespread the observed stability is. The study does not provide a representative average for all Chernobyl particles.
It also remains unclear how the measured structures relate to release rates across different particle types, how those rates change in varied environmental conditions, and what contribution these particles make to present-day human exposure. The paper’s findings do not establish that all fuel fragments are stable, that radionuclides cannot escape, or that exposure risks are lower than previously assessed. Researchers say more persistent outlier particles could release radioactive material later.
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Further Tests on Radioactive Phases
Weissenborn and Hennig are conducting follow-up experiments on transuranic phases in the accident remnants, according to the report. Further sampling across more sites and analysis of more particles would be needed to test whether the stability observed in this first set is common and to better characterize differences among particle types.
For now, the study does not support lifting restrictions in the Chernobyl Exclusion Zone. Researchers have not announced a timeline for broader sampling or a revised regional risk assessment. The next evidence will need to establish how representative the six particles are and how their structure affects radionuclide release over time.
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Key Questions
What did researchers find in the Chernobyl particles?
In six particles from two locations, X-ray diffraction showed that the nuclear fuel crystal structure remained largely intact about 40 years after the 1986 accident. Researchers also identified different uranium oxide phases.
Does the finding mean Chernobyl particles are safe?
No. The fragments remain highly radioactive, and the study did not measure health effects or show that exposure risks are reduced. A stable structure in the tested particles does not establish that radioactive substances cannot be released.
How many particles were studied?
The researchers analyzed six particles from two locations. They say substantially more particles and sampling sites are needed before drawing broader conclusions about particle stability.
Will the study change access rules for the exclusion zone?
No change was reported. The researchers said the findings do not allow restrictions to be lifted, and the study is not a region-wide health-risk assessment.
What research is planned next?
The researchers are conducting follow-up experiments on transuranic phases in the reactor remnants. Broader sampling would also be needed to determine how widespread the newly observed stability is.
Source: hn
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