Irradiation means exposing something to radiation, which is a form of energy that travels in waves or particles.

One common use of irradiation is making food safer to eat. Food companies sometimes use carefully controlled radiation to kill harmful bacteria in meat, fruits, or spices without cooking the food or making it radioactive. The radiation passes through like invisible light, destroying germs but leaving the food itself safe and fresh. Irradiated strawberries, for example, last longer without spoiling.

Doctors also use irradiation as a medical treatment, especially for cancer. They aim precise beams of radiation at tumors to destroy cancer cells while trying to protect healthy tissue around them. This treatment is called radiation therapy or radiotherapy.

The word can describe any situation where something gets exposed to radiation, whether it's intentional or accidental. Scientists might study how irradiation affects different materials, or engineers might worry about spacecraft components getting irradiated by cosmic rays in space. When you see the word irradiation, think about energy being directed at something for a specific purpose, whether that's killing germs, treating disease, or studying effects.