The little boy is the code name of the first atomic bomb dropped by the United States in Hiroshima, Japan during World War II. 1 On August 6th, 945, the B-29 super robotech bomber "Ainola Gai" piloted by paul tibbets crashed 3 1 0,000 feet (9,400 meters) above the Xiangshan Bridge in Hiroshima, at10 at 8: 00 a.m. Japanese standard time.
The "little boy" is the first nuclear weapon used against mankind in human history. The little boy is 10 feet (3 meters) long, 28 inches (7 1 cm) wide and weighs 8900 pounds (4000 kilograms). Using the design of "gun", a piece of uranium -235 with low critical mass was shot at three circular uranium -235 with the same low critical mass with explosives, resulting in a whole piece of uranium with supercritical mass and triggering a nuclear chain reaction. The little boy contained 60 kilograms of uranium -235 in his body, only about one kilogram of which split in the explosion, and the energy released was about equal to 13000 metric tons of TNT high explosive, that is, about 5.5 ×10/3 joules. About 70 thousand people died directly from the boy's initial explosion, and about the same number were injured. Then a large number of people died of cancer caused by nuclear dust radiation. Pregnant mothers will also miscarry because of radiation, and some newborn babies will be deformed.
According to statistics, until 1999, the total number of people who died from the direct attack of atomic bombs and nuclear radiation injuries of young boys has exceeded 200,000.
Fat man is the name of the atomic bomb dropped by the United States in Nagasaki, Japan during World War II. 1945 On August 9th, Charles sweeney's B-29 super robotech bomber "Burke's Car" dropped 3 1 000 feet (9000m) over Nagasaki. The explosion occurred at 1 1: 02 am Japan standard time, at 1, 800 feet (550 meters).
"Fat man" is the second and last nuclear weapon used against human beings in history so far, and it is an implosion plutonium bomb. Low critical spherical plutonium was placed in hollow spherical explosive, and 32 detonators were connected around it. After the detonator is connected to initiate, it produces a strong internal pushing pressure to squeeze spherical plutonium. When the density of plutonium increases to a supercritical state, it can trigger a nuclear chain reaction and a nuclear explosion. It is 10 ft 8 in (3.25m) long, 5 ft (1.52m) in diameter and weighs 10000 lb (4545kg). The energy released is about 2 1000 metric tons of TNT high explosive, about 8.4× 1.0 1.3 joules, slightly more than the first atomic bomb dropped on Hiroshima. Because Nagasaki is mountainous, the damage is lower than that of Hiroshima, which is flat. About 40 thousand people died directly from the explosion of the fat man, about 25 thousand people were injured, and about 7,000 square meters of buildings were razed to the ground. After that, tens of thousands of people died of cancer caused by nuclear dust radiation.
Fat man's primary target is another city in Japan, Kokura. When the B-29 fighter plane in charge of bombing flew over Kokura that morning, it found that the area was covered by clouds, so Svenny decided to attack Nagasaki, the alternate target.