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.
Radiation to the brain. There is always potential for some side effects to occur when radiation therapy is given to the brain. Many of these side effects are due to swelling of the brain (called cerebral edema). Side effects can develop shortly after treatment starts.