[Restorer]

Charcoal filters are available, although the increased resistance reduces air flow quite a bit.

I'm not familiar with this. Is the iodine in a gaseous or vapor state, rather than a particulate form?

[snopercod]

Iodine is a solid at room temperature, but sublimates directly into a gas at a little over 200 degrees F, IIRC.

All I know is that after a leak inside the containment structure of a nuclear power plant, the Iodine (fission byproduct) which will be released is supposed to be in gaseous form, which the charcoal beds in the containment structure are supposed to capture.

So maybe the charcoal bed would not be needed after the Iodine had cooled down and solidified.