1986 2013c-453 20thcentury adverseeffects airpollution chernobylnuclearaccident chornobylʹ congenitalabnormalities environmentalaspects ethnicrelations etiology foodcontamination governmentregulation governmentrelations healthandhygiene healthaspects history indians indoor indoorairpollution mining navajoindians northamerican politicalaspects radiation radiationinjuries radioactivecontaminationoffood radioactivehazardrelease radioactivepollution radioactivesubstances radon socialaspects socioeconomicfactors soilpollutants toxicology ukraine unitedstates uranium uraniumminesandmining waterpollution wn300b872i1990 wn610 wn610n269r1973