Forty years after the Chernobyl disaster, Poles recount the immediate response – including mass iodine distribution – and the long-term anxieties that followed.
Initial Response to the Chernobyl Disaster
On the night of April 25-26, 1986, an accident occurred at reactor number 4 of the Chernobyl Nuclear Power Plant. Around 1:24 AM, a hydrogen explosion and fire erupted due to overheating, releasing radioactive substances into the atmosphere.
Professor Zbigniew Jaworowski, then chairman of the Scientific Council of the Central Laboratory for Radiological Protection (CLOR) in Warsaw, was among the first to learn of the disaster. On the morning of April 28th, measurements from the Mikołajki station raised concerns, indicating radioactivity levels 500,000 times higher than normal. His initial thought was a nuclear war.
Government Delays and Financial Concerns
Professor Jaworowski informed authorities about the increasing radioactivity in the air. Jerzy Urban, the government spokesman of the Polish People’s Republic, opposed publicly disclosing complete information and measurement results, arguing against causing panic. According to Professor Jaworowski, he was only convinced by arguments regarding potential financial losses in the export of Polish food to the West, amounting to hundreds of millions of dollars, should Poland lose credibility with trading partners and consumers.
Iodine Distribution to Protect Against Thyroid Cancer
“We were at the peak of spring, so farmers were already letting cows out to pastures contaminated with radioactive iodine from Chernobyl. Therefore, the most important message I wanted to convey to the authorities was: children need to be given stable iodine as quickly as possible to protect them from thyroid cancer,” Professor Jaworowski said in an interview with “Polityka.”
On April 29, 1986, just three days after the explosion, Poland launched an unprecedented action: the mass distribution of potassium iodide solution. Primarily given to children, 18.5 million people consumed it within three days. In the USSR, iodine distribution began a month after the reactor explosion.
Experiences from Świerk and Early Detection
“My father worked in Świerk,” recalls one individual. In the days following the explosion (April 26-27), the radioactive cloud moved towards Belarus and Lithuania, then over Scandinavia, where increased radiation levels were recorded. Later, the wind shifted, directing the cloud over Poland, Czechoslovakia, and Austria.
The highest concentration in Poland was recorded in the northeastern part of the country, and rainfall caused localized contamination, including in the Opole region. Workers at the Institute of Nuclear Research in Świerk, home to Poland’s only research nuclear reactor, Maria, began detecting elevated radiation levels on April 28th.
Employees triggered alarms at the dosemeter gate upon returning to the institute on April 28th. Scientists quickly determined the alarm was caused by a very high concentration of radioactive iodine, indicating a reactor accident, likely in the USSR.
Public Reaction and Concerns About Pregnancy
Workers prepared potassium iodide solution and took it home. One individual remembers their father telling them to take the medicine without fully explaining why, noting their parents’ visible anxiety. The following day, schools were abuzz, with students queuing for nurses to administer the solution.
The Maria and Ewa reactors (decommissioned in 1995) were the only reactors in Poland at the time. Many had limited knowledge of the situation beyond the staff at the Institute of Nuclear Research in Świerk.
Local Experiences and Initial Reactions
Anna, a resident of the Wola Uhruska municipality (Lublin Voivodeship), was 10 years old at the time. The municipality is located near the Bug River, bordering Ukraine, approximately 150-160 km from the Chernobyl plant – directly in the path of the radioactive cloud.
She remembers her mother going to collect nettles for pigs and returning home, telling them not to go outside because “something was happening.” She described a gray, overcast atmosphere with a powdery substance on plants.
Long-Term Health Concerns and Uncertainty
Janina, a resident of Podkarpackie, was 26 years old. She recalls a warm period and a health center announcement requiring children and pregnant women to visit the clinic. The distribution of potassium iodide was organized by village.
She and her children received the solution, while she received an injection. Doctors provided little information, simply instructing her to receive the injection. She felt no immediate adverse effects. Many pregnant women were frightened and some drank potassium iodide by the glassful.
“Like every pregnant woman, I was afraid something would be wrong with the child, so I went to the clinic. Later, there was a lot of talk about children being born with defects. Every disability was linked to the explosion,” she said.
Scarcity and Limited Information
Maria, a resident of Łódź, was 40 years old. She remembers sitting by the window, feeling something was wrong. Working on Wólczańska Street, there was initially no information until the next day when the explosion was announced and potassium iodide was recommended. Everyone rushed to pharmacies, but supplies were limited.
Helena, also from Łódź, was a 39-year-old teacher. She recalls receiving instructions from above. Schools worked to prevent children from thinking about the explosion, aiming to keep them calm and indoors. While schools took precautions, what parents did afterward was beyond their control.
She did not take potassium iodide, reasoning that she had already breathed the air. She also avoided following news about the disaster, fearing the impact on her mental health. She acknowledges the fear shared by her and her colleagues.
“40 years have passed. God forbid we ever experience something like this again. The fear and anxiety… these are things people try to erase from their memory, if possible. It was a difficult time,” she concludes.
Radio Free Europe and Early Warnings
Piotr, a resident of Białystok, was 17 years old. He was in technical school and spent Monday planting trees in the forest, enjoying a beautiful, sunny day. Before Polish media reported the incident, people learned about it from Radio Free Europe, which reported a disaster at a Soviet nuclear power plant.
He remembers the bitter, unpleasant taste of the potassium iodide solution.
Long-Term Perspectives and Evolving Understanding
Forty years later, complete data and reliable analyses were lacking. Over time, reports from international organizations (including WHO and the UN) showed that the level of human exposure was lower than initially assumed. The Chernobyl disaster and Prypiat have become ingrained in popular culture, often dramatized in films and series.
In 2006, Professor Jaworowski stated that the radiation dose received by Poles was minimal. He added that, with the knowledge he has now about the scale of the contamination and what exactly happened at the Chernobyl plant, he would not have recommended even administering potassium iodide to the population.
Potassium iodide was intended to prevent the thyroid gland from absorbing radioactive iodine from fallout. A large dose of stable iodine temporarily blocked the absorption of radioactive iodine released into the atmosphere. However, medical research suggests that high doses of iodine may be associated with an increase in antithyroid antibodies, linked to autoimmune diseases like Hashimoto’s. Many factors, including the mandatory salt iodization program introduced in 1997, also influence thyroid disease development.
An increase in thyroid cancer cases was observed in the most contaminated areas: Belarus, northern Ukraine, and western Russia. According to experts in oncology, including the chairman of the Polish Academy of Sciences, there is no evidence of a significant increase in cancer cases in Poland. Reports from UNSCEAR and WHO indicate that the increase in cases is not due to radiation exposure but to improved diagnostics and thorough research, which was much less common before 1986.