I had a bit of a water issue, and now my 141 inhabitants all have significant radiation poisoning. Let's say they were at 50% poisoned ... how long would it take to fix? Is there any technique to speed it (e.g. uplevel my RadAway Production Room)?
Once there is sufficient purified water, radiation poisoning will decrease for dwellers in the vault under normal conditions. 50% radiation poisoning will go away in... about 4 to 6 hours. This cannot be sped up, only supplemented with the use of RadAways.