原子弹爆炸,通常可产生35种放射性元素,其中包括200多个同位素。而对人体危害最大的有~(90)锶等,因为~(90)锶半衰期长(28年),裂变产额高5.6～5.8%,和钙具有相似的化学性质,常和钙一起随食物链进入人体,主要蓄积在骨骼内,生物半衰期长达4000天,因此对人体会造成长期内照射。所以~(90)锶是核裂变产物污染外环境的主要指标之一,已引起世界各 The atomic bombings usually produce 35 radioactive elements, including more than 200 isotopes. (90) Strontium has a long half-life (28 years) and a high fission yield of 5.6-5.8%. It has similar chemical properties to calcium and is often used along with calcium Into the human body, mainly in the bones, biological half-life of up to 4000 days, so the human body will cause long-term exposure. So ~ (90) strontium is one of the main indicators of fission products fouling environment, has caused the world