 美国双边核合作协定要求由于这些协定而转让或生产的核材料获得足够的实物安全保障。为确保对美国负有义务的核材料采取的实
 U.S. bilateral nuclear cooperation agreements require that nuclear material transferred or produced as a result of these agreements is subject to adequate physical security. To ensure that physical protection measures over U.S.-obligated nuclear materials are comparable to the recommendations in IAEA publication INFCIRC/225, the United States has conducted over 190 bilateral assessment visits to 50 countries since 1974;