Man Made Nuclear Sources

Man made nuclear pollution takes place by nuclear explosions, nuclear wastes and use of radioactive rays to certain purposes.

1- Nuclear Explosions

A nuclear explosion causes both immediate radiation and residual radiation. Immediate radiation is given right now the explosion. It is dangerous only within two or three kilometers. If a living organism is near the explosion without adequate protection and managed to survive the effects of blast and fire, it can dramatically damaged by the immediate radiation.

Residual radiation is given off by the radioactive particles left as "fallout" after the explosion. The danger from fallout would be so great and widespread that it is discussed separately.
This radioactive material is then carried by winds until it settles to earth. This is called "Fallout". Under some circumstances you may see the fallout; under others you may not.
The radioactivity it gives off cannot be seen and it has no smell. But fallout doesn't come out of the sky like a gas and seep into everything. It can best be described as a fine to coarse sand carried by the winds. Because the wind direction varies at different heights above the ground, it is not possible to judge from the ground where the fallout will settle. It can settle in irregular patterns hundreds of miles from the explosion.
The fallout from a 5-megaton explosion could affect seriously an area of 7,000 square miles. If nothing were done to gain protection during the period of high radioactivity, there would be a grave danger to life in that area.
Because fallout is carried so far and covers such a large area, it could be the greatest danger to the largest number of Canadians in a nuclear war. If Canada was not hit by nuclear bombs, those exploding in the United States close to our border could result in serious fallout in many parts of Canada.
There are four things which determine the amount of radiation reaching your body from fallout:
1.The time that has passed since the explosion.
2.The length of time you are exposed to fallout.
3.The distance you are from the fallout.