Effects of the Atomic Bomb: Hiroshima and Nagasaki

The atomic bombs dropped in the final year of World War II have revealed to the whole world the tremendous power hidden in the atom. Both bombs caused hundreds of thousands of people to lose their lives and inflicted lifelong physical damage on many of the survivors.

Let us see how the enormous power inside the atom, causing the deaths of hundreds of thousands of people in a few seconds, is released second by second:

- The moment of explosion…
Let us assume that an atomic bomb explodes at an altitude of 2,000 m as it did in Hiroshima and Nagasaki. The neutrons bombarding the uranium and which split the first atoms into fragments creates chain reactions within the mass as mentioned before. In other words, the neutrons thrown out from the first fragmented nuclei hit other nuclei and split these new nuclei as well. Thus, all nuclei are rapidly fragmented in a chain reaction and the explosion occurs in a very short time. Neutrons move so fast that the bomb releases a total energy of 1,000 billion kilo-calories during one millionth of a second.

The temperature of the gas, into which the bomb is instantaneously converted, rises to several million degrees and the gas pressure rises to one million atmospheres.

- One thousandth of a second after the explosion…
The diameter of the detonated mass of gas increases and various rays are emitted. These radiations form the "initial flash" of the explosion. This flash may cause full blindness in anyone standing within an area having a diameter of tens of kilometres. This flash is hundreds of times stronger than that emitted from the surface of the sun (per surface unit). The time elapsed since the outset of the explosion is so short that people close to the explosion site cannot even find time to close their eyes.

The pressure of the shock causes heavy damage indoors. Power transmission towers, two-piece bridges and skyscrapers built from glass-steel are also damaged. In the close surroundings of the explosion, a great amount of powder-like fine dust is raised.

- 2 seconds after the explosion…
The flashing mass and the air surrounding it form a fireball. The heat radiated from this fireball, whose surface is still extremely hot and which glows like the sun and even more, is powerful enough to ignite all combustible matter within an area of 4-5 kilometres in diameter. The radiance of the fireball may cause irreparable damage to the sense of vision. At this moment, a shock wave moving at very great speed develops around the fireball.

- 6 seconds after the explosion…
At this point, the shock wave hits the earth and causes the first mechanical damage. The wave creates powerful air pressure, the intensity of which decreases as one goes farther from the centre of the explosion. Even around 1.5 km away from this point, the added pressure is twice as strong as normal atmospheric pressure. The chance of people staying alive at this pressure is 1%.

- 13 seconds after the explosion…
The shock wave diffuses along the surface of the earth and it is followed by the explosion created by the repositioning of the air sent by the fireball. This explosion diffuses along the earth at a speed of 300-400 km per hour.
In the meantime, the fireball has cooled down and its volume has decreased. Being lighter than air, it starts to rise. This upward motion causes the direction of wind on the earth to reverse and causes a strong wind to start blowing towards the centre, even though it was initially blowing outwards from the centre of the explosion.

- 30 seconds after the explosion…
As the fireball rises, its spherical shape is distorted and it takes the appearance of a mushroom.

- 2 minutes after the explosion…
The mushroom shaped cloud has now reached an altitude of 12,000 metres. This is the lower limit of the stratospheric layer of the atmosphere. The winds blowing at this altitude cause the mushroom shaped cloud to disperse and the components of the cloud (mostly radioactive remains) to scatter into the atmosphere. As these radioactive remains consist of very tiny particles, they may rise to higher layers in the atmosphere. Before falling on the earth, these remains may be made to travel several times around the earth by the winds blowing in the upper layers of the atmosphere. Thus, radioactive remains may be dispersed all over the world.

Radiation Emitted By the Atom

Radiation consists of gamma rays, neutrons, electrons and similar sub-atomic particles moving at very high speeds such as 200,000 km per second. These particles may easily penetrate the human body and harm the cells forming the body. This damage may cause a fatal cancer or, if it takes place in reproductive cells, it may give rise to genetic disorders that will influence generations to come. Therefore, the results of a radioactive particle hitting a human being are very serious.

Radiation released in atomic explosions affects living beings either directly or through the products of radioactive decay that emerge during the explosion.

As one of these particles or rays travels at high speed in matter, it collides very strongly with atoms or molecules that get in its way. This collision may be a disaster for the delicate structure of the cell. The cell may die, or, even if it recovers, it may start to grow in an uncontrolled fashion - which is cancer - perhaps weeks, months, or years later.

Radiation is very intense in an area of 1,000 metres in diameter around the centre of the explosion. Those who survive other fatal factors lose almost all white cells in their blood, wounds appear on their skins, and all of them die because of haemorrhages in a short period of time from a few days up to two or three weeks. The effect of radiation on those farther from the point of explosion varies. Those who are exposed to these harmful rays emitted by the fireball at distances of 13, 16, and 22 km suffer from third, second, and first degree burns respectively. Digestive problems and haemorrhages are experienced less, but real disorders appear later: hair loss, skin burns, anaemia, sterility, miscarriages, giving birth to crippled or deformed babies. In these cases, too, death is possible within a period from ten days to three months. Even years later, sight disorders, leukaemia and radiation cancer may develop. One of the greatest dangers of hydrogen bomb explosions (another nuclear bomb of enormous destructive power caused by the fusion of the nuclei of various hydrogen isotopes in the formation of helium nuclei) is the entrance of radioactive dust into the body through respiration, digestion and the skin. This dust causes the above-mentioned disorders depending on the degree of contamination.

All these are caused by atoms, which we cannot even see with our eyes. Atoms can form life just as they can destroy it. This property of the atom shows us very clearly how helpless we are and how superior is Allah's power.