美国发生的最严重的核电站事故,即1979年的三里岛事故,导致放射性物质释入环境。不过,这起事故未使公众受到超过辐射剂量限值的照射。事实上,美国的103台有执照的核电机组的运行或发生的事故,从未使公众任何成员受到超过剂量限值的照射。尽管如此,我们不能就美国对有许可证的放射源的运行经验作出这样的 The worst nuclear accident in the United States, the Three Mile Island accident in 1979, caused the release of radioactive material into the environment. However, the incident did not expose the public to radiation above the radiation dose limit. In fact, the operation or accident of 103 licensed nuclear power plants in the United States never exposed any dose of radiation to any member of the public. In spite of this, we can not make any comment on the operational experience of the United States with regard to a licensed radioactive source