Radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.
Exposure to very high levels of radiation, such as being close to an atomic blast, can cause acute health effects such as skin burns and acute radiation syndrome. It can also result in long-term health effects such as cancer and cardiovascular disease.
Radiation occurs naturally from minerals and also comes from man-made elements. Naturally occurring radioactive minerals in the ground, soil, and water produce background radiation. The human body even contains some of these naturally-occurring radioactive minerals.
Radioactive material is found throughout nature. It is in the soil, water, and vegetation. Low levels of uranium, thorium, and their decay products are found everywhere. Some of these materials are absorbed with food and water, while others are inhaled.
Radiation can travel far in the air, up to several yards as they are lighter than alpha particles. The beta particles can penetrate up to one-half an inch through skin and into the body.
Shielding simply means having something that will absorb radiation between the source of the radiation and the area to be protected. This happens when there is a gradual loss in intensity of any energy while passing through a medium.
Lead metal is the preferred material for radiation shielding. It is so because lead is highly effective in providing protection from sources of radiation.
Everything depends upon the activity of the source. So there is no conception like that, ionizing radiation can't be measured like that.
The Atomic Energy Regulatory Board (AERB) was constituted by the central Government in November 1983 to exercise the regulatory and safety functions envisaged under Sections 16, 17 and 23 of the Atomic Energy Act, 1962.