40 years since Chernobyl accident

A serious nuclear accident occurred at the Chernobyl Nuclear Power Plant, located in what is now Ukraine, on April 26, 1986. The accident began with a test of experimental equipment, which led to a loss of control of the reactor, an explosion, and a fire. As a result, a large amount of radioactive material was released into the atmosphere. On this page, we have compiled information about the accident and its effects.

Effects in Ukraine and the surrounding areas

The accident contaminated large areas of Ukraine, Belarus, and Russia. More than 100,000 people were evacuated, and tens of thousands more were evacuated later. The flora and fauna of the surrounding area were exposed to radiation, and effects were observed in several species. The accident caused serious radiation injuries to those who worked at the plant, and the incidence of thyroid cancer increased, particularly among children, due to radioactive iodine.

The Effects of Chernobyl in Finland

Radioactive substances were carried by air currents to Finland in about a day. The first observations were made on April 27, and STUK was notified of the situation on April 28. The highest concentrations were measured that same evening. Fallout was uneven and depended on rainfall, which is why the amount of radioactive material varied by region.

Lessons Learned from the Chernobyl Accident

The Chernobyl accident led to international changes in the safety culture of nuclear power plants and in the regulation of radiation safety. In Finland, STUK developed its capabilities and measurement systems, and communication with the public was improved. The accident serves as a reminder of the importance of managing the risks of nuclear energy and the role of authorities in protecting the public.