The effect of the wind leads to a shock wave or blast, a high pressure wall of air spread itself at the speed of sound or more.
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She was a brave person because she had to directly look at the enemy plane and receive the rays following this event" The black part- the cornea with iris- was burnt and pierced. This is what the Doctor Nagai observed when he found the body of the nurse Inouye: " the white parts of the eyes – conjunctivitis- was normal. The thermal rays were reflected by the white parts of an object and absorbed by the black parts. These burns were lethal on people who were not sheltered and it is estimated that 20-30 % of the deaths were due to the consequences of these burns. It is the infrareds emitted in the first 3 seconds which caused the burns that could be seen on the uncovered parts of the body, up to 4km from the point of impact. Source : Dominique Grenêche - Histoire : développement du nucléaire militaire et civilĪt the Nagasaki explosion, the fireball reached a million degrees and its brightness lasted around 10 seconds.
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That day, the sky was clear it was quite warm and a calm atmosphere.Īfter the Trinity's test which showed that implosion firing worked for plutonium bombs, the United States had a second bomb, called Fatman, which they dropped on Nagasaki on August 9, 1945. The bomb dropped from 9600 metres of altitude to explode around 500 metres from ground. Three days after hHroshima, the 9th August at 11h 02, two B29 bombers, that had flown over the peninsula of Shimamara, arrived above Nagasaki coming from North-East and launched the second plutonium bomb in the North of the city. Paul Tibbets the pilot of the Enola Gay who drop the bomb, considered in the USA an hero at the time, never expressed during his long life much regret on the death of thousands of innocent victims. The uranium bomb was dropped on Hiroshima on the 6th August 1945. This enabled him to tell Stalin that the United States had a new and terrifying weapon against Japan. President Truman received the news at the Potsdam Conference, which was being held at the same time. It was estimated that the energy of the explosion was divided as follows: 35% as heat, 50% for the blast and 15% in the form of radioactive energy. The strong expansion of the air around the epicenter generated a blast. A huge fireball was created immediately after the explosion accompanied by a wave of heat and extremely high radioactivity. The energy of the plutonium bomb dropped on Nagasaki, nicknamed FAT Man, was estimated at 21 kilotons of TNT.