People around the world has been panicking about the danger of radiation due to the damaged nuclear plant in Fukushima prefecture in Japan after tsunami attack in the said country.
Who else didn’t?
Anyway, radiation, basically, according to wikipedia, is a process in which energetic particles or energy or waves travel through a medium or space. There are two distinct types of radiation; ionizing and non-ionizing. The word radiation is commonly used in reference to ionizing radiation only (i.e., having sufficient energy to ionize an atom), but it may also refer to non-ionizing radiation (e.g., radio waves or visible light). The energy radiates (i.e., travels outward in straight lines in all directions) from its source. This geometry naturally leads to a system of measurements and physical units that are equally applicable to all types of radiation. Both ionizing and non-ionizing radiation can be harmful to organisms and can result in changes to the natural environment.
True enough, radiation is harmful but never be contagious.
Upcoming post will be on Radiation effects to humans.