<blockquote class="twitter-tweet tw-align-center" data-lang="en">
Grand Canyon tourists exposed for years toradiation in museum building, safety manager says ElstonStephenson, safety manager at Grand Canyon National Park, saysthousands were unknowingly exposed to unsafe radiation for nearlytwo decades. ... https://t.co/jVpLuyPrww#USRCpic.twitter.com/hSnpJOZ9bw
― U.S. Reality Check (@USRealityCheck) February 18, 2019</blockquote>
斯蒂芬森曾试图说服公园管理高层让其警告公众,自2000年以来,任何来此工作或游玩过的人都可能已经受到辐射影响。据他估测,这一辐射量已远远超过美国核管理委员会规定的“安全”水平,已超出规定儿童承受水平的4000倍,超出规定成人承受水平的400倍。但是公园的管理高层对此“迟迟不做答复”,他认为管理高层的这种行为违反了法律。