Is ray ray helpful?

I don't think so..... But there is an artist called Billy Ray Cyrus.

kill cancer and other rapidly dividing cells in your body, and sterilizing objects such as a surgeons instruments, and food.

x rays can hurt but cant kill you. so if there searching for a life threatning object in your body it matters. so they are helpful but they sometimes injure people.

They can be used to sterilise food, and kill bacteria.

Some of Earth's animals have their vision enhanced in those wavelengths. Mate selection and sustenance predation (or foraging) would be primary uses.