1. THE LITTLE BOY

2. Development  The Little Boy bomb was constructed through the Manhattan Project during World War II.  Creation of the bomb started in May, 1945.  Had 1000 tons of uranium ore transported to a New York warehouse in 1939.  The bomb was very dangerous to handle because any misfire of the explosive would trigger a chain reaction and cause the bomb to explode. There was also the fear of extreme heat or lightning triggering a reaction.

3. Basic weapon design  Length-.8 feet  Diameter- 28 inches  Weight- Approximately 8,900 pounds

4. How it Worked  Used the Gun Method, which is when you shoot one piece of the uranium onto the other by means of chemical explosives, creating a nuclear chain reaction.  It produced an explosive force equal to 20,000 tons of TNT.

5. Assembly

6. The bombing of Hiroshima  The bomb was armed in flight 31,000 feet above the city, then dropped at approximately 08:15. After falling for 43 seconds  The detonation happened at an altitude of 1,900 feet. With a power of 13 to 16 kilotons.  It was less powerful than Fat Man but caused more damage because Hiroshima was on flat terrain.  According to published US Army figures 66,000 people were killed as a direct result of the Hiroshima blast, and 69,000 were injured to varying degrees.

7. 3 Main Affects of Atomic Bombs  Blast  The blast from a nuclear bomb is the result of the fireball sending a shock wave in all directions at a velocity greater than the speed of sound  Radiation  All of the radiation from the Little Boy came directly from the fireball.  There was no radioactive fallout due to the height of the explosion.  Fire  The first effect of the explosion was blinding light, accompanied by radiant heat from the fireball. The Hiroshima fireball was 1,200 feet in diameter, with a temperature of 7,200 °F.  Near ground zero, everything flammable burst into flame, glass products and sand melted into molten glass, and any humans were either vaporized or turned to carbon instantly.

8. “Shadow"  There were many cases when a victim was instantly vaporized by the blast and the extreme heat burned a shadow of the victim.

9. Sources  http://en.wikipedia.org/wiki/Little_Boy#Assembl y_details http://en.wikipedia.org/wiki/Little_Boy#Assembl y_details  http://www.historylearningsite.co.uk/atomic_bomb.htm http://www.historylearningsite.co.uk/atomic_bomb.htm  http://www.nationalmuseum.af.mil/factsheets/fact sheet.asp?id=1026 http://www.nationalmuseum.af.mil/factsheets/fact sheet.asp?id=1026