| environ. |
radiation effect Prolonged exposure to ionizing radiation from various sources can be harmful. Nuclear radiation from fallout from nuclear weapons or from power stations, background radiation from substances naturally present in the soil, exposure to X-rays can cause radiation sickness. Massive exposure to radiation can kill quickly and any person exposed to radiation is more likely to develop certain types of cancer than other members of the population (从众多研究资料来看，长时间暴露在电离辐射中是有危害的。从核武器或核电站产生的核辐射尘，从土壤中的物质产生的背景辐射，暴露在X射线中都会引起辐射病。大量暴露在辐射中会很快致死，而且暴露在辐射中比其它的污染更容易致癌。) |
