RADIATION POLLUTION

Radiation is the emission of rays and particles from a source. We live in the midst of continuous flow of radiation. Natural radiation comes from the sun, other other objects in space and rocks and mineral in the earth.Artificially produced radiation is widely used in fields of communication, industry, medicine and research. Most scientist believe the amount of radiation to which we are exposed is not harmful. But large does of radiation cause biological and chemical changes in living tissues. Illness and even death can result due to excessive amount of radiation.
It was only after the advert of nuclear weapons that the exposure levels have increased enormously. The menace of radioactive pollution spreading into the environment has increased extensively as a result of the discovery of artificial radioactivity, particularly due to the development of atoms bomb, hydrogen bomb and of techniques harnessing nuclear energy.
 A large quantity of long-lived radio nuclides are  released to the atmosphere during nuclear test. The tests may also result in fallout of radioactive substances on surface.
Leakage of nuclear radiations from nuclear reactors has also increased.Even the proper handling of radioactive substances and use of techniques of shielding screens for preventing radiations, cannot stop radiation leak out from these reactors.