The 289 area code was created as an area code overlay for the Mississauga (Streetsville) area. Unlike the previous solutions, this process did not require the place to be geographically separated by different area codes.
Ionizing radiation is a term used for radiation whose quanta have energy to directly or indirectly ionize (one or more electrons are released from the atom of the given substance) molecules or atoms while passing through matter, hence the name ionizing radiation.
The term radiation-induced bystander effects describes a situation where cells that have not been directly exposed to ionizing radiation behave as though they have been exposed: they die or they show chromosomal instability and other abnormalities.