Is rad oncologist usually exposed to a lot of radition?

Is rad oncologist usually exposed to a lot of radition in his/her work?

No. Read the FAQ

Is rad onc safe or will my baby have three heads?
Your baby may have three heads, but we had nothing to do with it.

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I read the FAQ, only find this
"Is rad onc safe or will my baby have three heads?
Your baby may have three heads, but we had nothing to do with it".

But can anyone tell me how radi oncologists usually conduct their procedures? How can they avoid touching radioactive materials?

in brachytherapy (radioactive sources placed inside a pt) its not "touching" that's the issue, its proximety. The closer you are and the longer you are near a source, the more radiation you get. I could describe in Sv what the limitations are but that would be meaningless to you. Save to say that if I can safely put a source in a patient for days to years, Id have to be pretty darn careless to expose myself to any meaningful dose. Standing a few feet from a pt with a gyn source in them for an hour would give me about an x-rays worth. Im not near them with the source unshields for more than a few seconds (and actualyl that was as a resident- i dont do them at all now). For high dose rate srouces you aren't even in the room when they're delivered. The vast majority of the cases are teletherapy- that is delivered by a machine with only the patient in the room and the exposure is essentially zero to staff.