I just want to add a bit of the science I know to this discussion. "radiation poisoning" is not like a typical poison you would imagine. It does not "get stuck in clothing" per say. A radioactive material shoots out particles very fast. Think of them as atomic sized bullets. These bullets hit your atoms (in your body) and screw them up. It can brake down your DNA and other "building blocks" for your body. Thus, your body loses its ability to repair its cells to some extent and loses the proper function of other cells. The more radioactive something is the more little bullets that are shot from the material. The size of the particles also have an effect on the danger, which differentiates alpha, beta, and gamma radiation.
So, fundamentally, provided the gold had all the DNA sequences stored, I could picture it healing you perfectly with no issues. If the gold relied upon your bodies DNA for the structure, and simply advanced cell repair, then you could be in trouble still.
There is also the question of how will the radiation affect the metalmind. The particles emitted will do the same thing to the gold as it will to your body. It will get bombarded and it will be "damaged" in a sense. I wonder if this would be a way to corrupt metalminds or screw with sDNA. I would hope that sDNA is safe in the spiritual realm, but perhaps it is tied together.