Deaths due to the Chernobyl Disaster

Lore & Background

At first the Soviet Union counted only the two plant workers killed in the immediate aftermath of the explosion. By late 1986 officials had raised the official count to 30, adding 28 plant workers and first responders who died in the following months.

Some evacuees argue that the official toll leaves out deaths they say they witnessed in the weeks and months after the explosion. Agencies of the United Nations have dismissed such claims as misinformation or urban legend.

Long-term estimates range from 4,000 up to 9,000 for the most exposed people of Ukraine, Belarus and Russia, to 16,000 for all those exposed across Europe, and as high as 60,000 when minor effects around the globe are included.

Reader's Guide

All of these projections rest on the linear no-threshold model, which is itself heavily contested. The same difficulty affects attempts to estimate the harm done by low levels of radon, air pollution and sunlight: very small risks fall outside what empirical science can detect.

Thyroid cancer is the clearest long-term effect, and it responds relatively well to treatment. Applying a mortality rate of 1% to the 16,000 cases predicted across Europe gives a likely final toll of around 160 deaths from that cancer.

Among the liquidators, no validated increase in solid cancers has been reported, and the increases in leukemia that were observed were statistically insignificant. Their average external dose was 117 mSv. A study using whole genome sequencing found no transgenerational effects in the children of those who worked as liquidators.

Did You Know?

• The projected risk of thyroid cancer across Europe is roughly 1 in 10,000 as a probable worst case.
• A medical journal has noted that the total death toll remains contested.