this technique used to preserve with radiation is called irradiation which makes food safer to consume but also does not make the food radioactive
During the x ray the machine start buzzing sparking letting out radioactive gases Lily came running out from behind the protective screen.Due to the over exposure of gamma rays turning the dogs fur and Lily's hair green.
After the x ray the doctors were worried hey had over exposure to gamma radiation and could create mutation or even better give them powers. After running some tests they found they could sense fire, kill cancer cells and help eye and bone cancer.
The next day a patient needed emergency cancer treatment but due to the broken machine the doctor decided to put lily and the stray dogs powers to use by sending high energy rays to the affected area, but to protect lily and he dog from over exposure from they used lead sheet around 3 cm to stop gamma rays
That afternoon the dog she decided to call Alpha started barking and Lily had a weird sensation and looked out of the hospital window to find apartment block on fire with no working smoke alarms she quickly alerted emergency services and the fire was controlled quickly
That night the hospital had food that needed to be preserved so the doctors suggested they used the new radiation team to help preserve the food, by exposing the food to gamma rays which helps kill any bacteria and stops food borne diseases and spread of invasive pest.