'Little Boy' weighed about 9,000 pounds and had a yield approximating 15,000 tons of high explosives. It is 28 inches in diameter and 120 inches long. Photo restoration by TX Unlimited, San FranciscoĪ nuclear weapon of the 'Little Boy' type, the uranium gun-type detonated over Hiroshima. Nagasaki, Augphotograph by Yosuke Yamahata used with permission of copyright holder, Shogo Yamahata/Courtesy: IDG films. FOIA Advisory Committee Oversight Reports.
