no special clearances, and it would be in a normal tank wagon. What i hauled was in a standard Dry van.
the pain is your numbers....the reading they take in the trailer has to be below a certain threshold before you can leave the delivery point. If in a tank, i’d imagine they would have to wash the tank out on site to remove any washdown/residue. No telling how long after empty you would have to stick around
I’ve cleaned some ISO containers from SRS that supposedly had radioactive material in them. I don’t know if they were sent loaded down the road or just used for storage at the plant. They had been sent somewhere else beforehand to be cleaned of radioactive residue which I guess is only performed by one facility in the country and I was just cleaning then a 2nd time before sending they picked them up to take them over.