广岛原子弹爆发的介绍.ppt

/w_19rrem9dy9.html Mushroom cloud，Hiroshima ----August 6th 1945 The causes of things 1945.7.26 In July 26, 1945, America, Britain and the Republic of China issued a “Potsdam declaration（波茨坦宣言）, urged Japan to surrender. In July 28th, the Japanese government refused to accept the Potsdam declaration. For reasons of military and political, American government in accordance with the original plan, used the atomic bomb on Japan. 7月28日，日本政府拒绝接受《波茨坦宣言》。出于军事和政治原因，美国政府按照原计划，在日本使用原子弹。 The first Atomic bomb, nicknamed little boy ----the Manhattan project 小男孩 Optical radiation 光辐射 Shock waves 冲击波 Nuclear radiation 核辐射 Electromagnetic pulse 电磁脉冲 Radioactive contamination 放射性沾染 In Hiroshima， fires sprang up immediately all over the wide flat central area of the city; these fires soon combined in an immense fire storm In 1945 OctoberHiroshima in ruins The destroyed Hiroshima The victims The damage The rails bent （扭曲） The steel collapses（倒塌） Multiple damages Blast（爆破）, or pressure wave, similar to that of normal explosions. Primary fires, those fires started instantly by the heat ,radiated from the atomic explosion. Secondary fires, resulting from the collapse of buildings, damage to electrical systems, overturning of stoves Radiation injuries caused by the instantaneous penetrating radiation (similar to excessive X-ray exposure) from the nuclear explosion; all of these effective radiations occurred during the first minute after the beginning of the explosion 瞬时穿透照射引起的辐射损伤 （类似于过度的X射线照射） 从核爆炸开始的第一分钟就对人体差生巨大的伤害. The surviving buildings Hiroshima Peace Memorial Park In scribed on the Memorial Cenotaph （纪念碑）in Japanese is: “Let all the souls here rest in peace, for we shall not repeat the evil.” For peace ： This tragic history has left us a large number of information to tell visitors the importance of peace. 留给世世代代后人的警醒 the reconstruction of Hiroshima