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.
An early effect is a radiation response in humans within a few days to months due to a substantial dose. These early effects are described as deterministic and they exhibit increasing severity with increasing radiation dose, also there is usually a dose threshold. Genetic effects are late effects.