The transmission or emission of energy from a source through the propagation of particles or wave via a medium (whether material or space) is known as radiation. This radiation may be categorized as either ionizing, with energy more than ten eV or non-ionizing, with energy less than 10 eV.
Radiation may be generated from a variety of sources, both natural and human-made. The most important natural source of radiation is the cosmic radiation. This form of radiation is produced by two sources, the sun, and space. The sun is a continuous source of radiation entering the world’s atmosphere. The processes of fusion ongoing on the sun generate high energy radiation that travels to the earth in the form of particles (mainly the free protons). They reach the earth through the solar winds. However, the radiation emitted by the deep space is stronger than the solar radiation and is less frequent.
Another natural source of radiation is the drinking water. This water absorbs radiation from the natural sources, such as soil and rocks. The natural gas utilized for cooking or heating also contains trace amounts of radiation. Furthermore, radiation can also be found in soil. The radioactive particles in soil may either be the remaining ones from the original crust of the earth or maybe the absorbed radiation from the cosmic rays. Another natural source of radiation is lightning.
Among the artificial sources, the television is a huge source of radiation. Also, the screens of the monitors of the computers also generate radiation. However, the televisions that do not have cathode ray tubes do not emit radiation. Moreover, other daily use products, like clocks, and cell phones generate radiation. The radiation produced by cellphones is in the form of the waves of radio frequency (RF). These waves are much less intense than X-Rays and hence are not as damaging as them.
Radiation can also be found in the medical imaging equipment. A lot of the imaging devices used to diagnose various diseases utilize X-Rays. These devices are the most dominant source of radiation. Also, radiation can also be found in cigarettes in the form of the smoke that the smokers inhale. It is due to the fertilizers used to cultivate the tobacco crops.