Thousands of hectares of Chornobyl-affected farmland, long deemed too dangerous for cultivation in northern Ukraine can safely return to production, according to new research.
The study, led by the University of Portsmouth and the Ukrainian Institute of Agricultural Radiology, developed a method for the safe reassessment of farmland abandoned after the 1986 nuclear accident.
Published in the Journal of Environmental Radioactivity, the research opens the door to potentially reclaiming large areas land for agricultural use - land that has remained officially off-limits for over three decades due to radioactive contamination.
Since the Chornobyl disaster, large regions of northern Ukraine were designated as too hazardous for farming. The 4200 square kilometre "Chornobyl Exclusion Zone" around the nuclear site remains uninhabited and is now one of Europe's largest nature reserves.
A second 2000 square km area - the "Zone of Obligatory Resettlement" - was never fully abandoned. The area is home to thousands of people, has schools and shops but no official investment or use of land is allowed.
This research is important for communities affected by the Chornobyl disaster. Since 1986 there has been a lot of misinformation about radiation risks from Chornobyl which has negatively impacted on people still living in abandoned areas. We now have a validated, science-based approach for bringing valuable farmland back into official production while demonstrating safety for both consumers and workers.
Professor Jim Smith, University of Portsmouth
Since the 1990's scientists in Ukraine and overseas have been saying that the land can be safely used again despite contamination by radiocaesium and radiostrontium. But political complexities have meant that the land remains officially abandoned. That hasn't stopped a few farmers taking matters into their own hands and beginning unofficial production in some areas. The new study has confirmed that the farmers were right - crops can be grown safely in most areas.
Using a 100-hectare test site in the Zhytomyr region, the researchers developed a simple yet robust protocol to evaluate contamination levels and predict the uptake of radioactive substances by common crops such as potatoes, cereals, maize, and sunflowers.
By analysing soil samples and measuring external gamma radiation, the researchers confirmed that the effective radiation dose to agricultural workers is well below Ukraine's national safety threshold, and significantly lower than background radiation levels experienced naturally all over the world.
The findings show that, with proper monitoring and adherence to Ukrainian food safety regulations, many crops can be safely grown in these previously restricted zones.
Professor Jim Smith from the University of Portsmouth was lead author of the study. He said: "This research is important for communities affected by the Chornobyl disaster. Since 1986 there has been a lot of misinformation about radiation risks from Chornobyl which has negatively impacted on people still living in abandoned areas. We now have a validated, science-based approach for bringing valuable farmland back into official production while demonstrating safety for both consumers and workers.
This isn't just about Chornobyl. It's about applying science and evidence to ensure people are protected, while making sure land isn't needlessly left to waste.
Professor Jim Smith , University of Portsmouth
The team hopes this protocol can serve as a model for other regions worldwide dealing with long-term radioactive contamination. With careful implementation and community involvement, the researchers believe Ukraine could safely reclaim up to 20,000 hectares of agricultural land, contributing to food security and rural development.
"This isn't just about Chornobyl", said Professor Smith. "It's about applying science and evidence to ensure people are protected, while making sure land isn't needlessly left to waste.
