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has contributed to radiation exposure in various ways. First he has concentrated naturally occurring radio-active substances, particularly radium, and used their radiations for medical diagnosis (X-ray examinations and photographs) and for certain types of treatment. More recently he has learned how to produce radiations for scientific research, and to use them for industrial purposes. Finally he has learned to “split the atom” and from this knowledge have stemmed both nuclear weapons and nuclear power stations. A nuclear explosion is accompanied by intense radiation, the effects of which may go farther than those of the blast and heat. Secondly the explosion liberates a quantity of radio-active dust, which goes high into the sky and is slowly deposited as “fall out.” Atomic power stations produce radiations which would be dangerous to life nearby if precautions were not successful. The greatest worry relating to these stations is, however, that they produce large amounts of radio-active waste products which could cause great danger if not disposed of properly.Конец ознакомительного фрагмента.
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