We have endless reports from international agencies. Cover-up? I doubt it. Ukraine and Belarus want aid and help, have no interest in covering up, and it’s difficult to believe in an international nuclear industry driven cover-up taking in all those UN agencies.
What did these agencies say? Read for yourself,
http://www.who.int/ionizing_radiation/chernobyl/en/
http://www.who.int/ionizing_radiation/chernobyl/IAEA_Pub1239...
http://www.who.int/ionizing_radiation/chernobyl/chernobyl_di...
http://whqlibdoc.who.int/publications/2006/9241594179_eng.pd...
http://www.unscear.org/docs/reports/annexj.pdf
http://www-pub.iaea.org/MTCD/publications/PDF/Pub1239_web.pd...
http://www.iaea.org/newscenter/statements/2005/ebsp2005n008....
and so on, the list really is endless, you can click through for hours.
What is this "large body of evidence" you speak of? It would be nice to have some reports by reputable scientists but all you've done is spew conspiracy hystaria.