Oh, well. The website is, if not an outright fake, heavily exaggerated.
There is a comment on it here
http://www.uer.ca/forum_showthread.asp?fid=1&threadid=8951
And scroll down to the long response for a description of Chornobyl by
someone who toured it.
>>http://www.angelfire.com/extreme4/kiddofspeed/
Details of the commercial tour that they did take...
http://www.ukrcam.com/tour/tour_3.html