How Many Cancers Did Chernobyl Really Cause?

From the Union of Concerned Scientists:

There is a lot of confusion about how many excess cancer deaths will likely result from the 1986 Chernobyl accident in Ukraine. As we see below, 70,000 and 35,000 are reasonable estimates of the number of excess cancers and cancer deaths attributable to the accident.

Much lower numbers of cancers and deaths are often cited, but these are misleading because they only apply to those populations with the highest radiation exposures, and don’t take into account the larger numbers of people who were exposed to less radiation.

The discussion below is an expanded version of the discussion on page 15 in the 2007 UCS report Nuclear Power in a Warming World.

Perhaps the most authoritative report on the consequences of Chernobyl is Chernobyl´s Legacy: Health, Environmental and Socio-economic Impacts, released by the UN-sponsored Chernobyl Forum (September 5, 2005). According to this report (p. 15):

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