放射性核素体内污染指放射性核素通过各种途径(呼吸道、消化道、伤口等)进入体内,超过其自然存在量,是一种非正常状态;如果放射性核素超过相应的年摄入量限值(ALI),可能造成内照射,引起放射病或其他不良健康效应。压水堆核电站的放射性物质一般在一回路中,绝大部分都在燃料组件 Radionuclide in vivo pollution refers to radionuclides into the body through various means (respiratory tract, digestive tract, wounds, etc.), exceeding its natural existence, is an abnormal state; if the radionuclide exceeds the corresponding annual intake limit Value (ALI) may cause internal exposure, causing radiological or other adverse health effects. The PWR nuclear power plant radioactive material is generally in a loop, most of the fuel components