Welcome to SMF. There are several demolition forums that might offer some insight as well.
I was a consultant for the gutting of an old power plant in Omaha a few years ago. It was around 10,000 tons of metal, a good share was radioactive. There was no problem selling it. Another job included metal from the oil feilds in Wyoming where the metal is radioactive from being buried in the ground. From my experience, it is dependent on the level of radiation. We used gasoline torches and liquid oxygen in both situations.
For more information on the power plant, it was documented at:
A Scrappers Dream: cutting torch
A Scrappers Dream
There are several other threads titled A Scrappers Dream. Use the advanced search button in the upper right hand corner and search the titles and my name.
Good luck to you.


- low background radiation steel






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