FREINZ.........YÁ, YÁ

http://www.epa.gov/

http://nlquery.epa.gov/epasearch/epasearch?typeofsearch=epa&areaname=&areasidebar=epahome_sidebar&filter=&result_template=epafiles_default.xsl&querytext=CHE*&image.x=11&image.y=5

http://www-ns.iaea.org/downloads/rw/waste-safety/chernobyl_tc_ns_crp1.pdf