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          放射性污染
          放射性物質存在于任何地方,學習放射性污染的知識才能保護自己。

           

           

              在自然界和人工生產的元素中,有一些能自動發生衰變,并放射出肉眼看不見的射線。這些元素統稱為放射性元素或放射性物質。在自然狀態下,來自宇宙的射線和地球環境本身的放射性元素一般不會給生物帶來危害。50年代以來,人的活動使得人工輻射和人工放射性物質大大增加,環境中的射線強度隨之增強,危機生物的生存,從而產生了放射性污染。放射性污染很難消除,射線強弱只能隨時間的推移而減弱。

            

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