You wrote :
What do 99.9 people out of 100 think of immediately when they hear the word Chornobyl?
The LNT theory?
The amount of natural radiation in different parts of the world?
The effect of small doses of radiation?
They immediately recall the repeated statements about hundreds of thousands or millions of victims who died as a result of Chornobyl.
That's very true -- but you don't say what can be done about it -- particularly in the face of continuing support of this myth from many Ukrainian & Belarus authorities (and even UN's Coffi Annan !). Of course the western media will continue to quote them -- in preference to statements from UNSCEAR.
IMO, contradicting the Chernobyl myth today is not unlike what it would have been like to claim that there were no witches or seamonsters in the Middle Ages, or that the earth isn't flat & isn't the center of the universe.... in those days you risked getting burned at the stake -- today you risk losing credibility with your audience.