【世界核新闻网站2009年3月9日报道】与20世纪80年代初相比,美国人目前受到的医疗辐射照射剂量增加了5倍。医疗辐射照射剂量目前已占美国人均照射剂量的近50%。根据美国国家辐射防护委员会 [World Nuclear News Web Site, March 9, 2009] Americans are currently receiving a five-fold increase in their doses of medical radiation compared with the early 1980s. Medical radiation exposure doses now account for nearly 50% of the U.S. average exposure dose. According to the U.S. National Commission on Radiological Protection