Answer: Irradiation
Step-by-step explanation: Irradiation is the process by which the food or the package is first exposed to the ionizing radiation.
The radiations like gamma rays, x-rays or electron beam are exposed to the food which increases the shelf life of the food by killing the harmful bacteria in it or by preventing the growth of harmful bacteria on the food.
It basically aids in killing the bacteria that causes the food spoilage.