All dwellers are radiated - how could this happen?

I've come back to my game now after a half hour. Everything seems fine - enough food, water and electricity.
But as I selected the first person to check their health, he was radiated about the half of their life. I checked all others. EVERYONE is radiated. What could happened? I have 40 dwellers in many different rooms. Is this a bug or was there another fallout? :-D
Best Answer
I think while you were gone there was maybe mole rat ora rad roach infestation and one of your dwellers got poisoned. Like real-life poison spread. According to the fallout, it was radiation. With enough rad aways, or clean water, your all good until. But my method is to have 6 people working in a maxed Science lab. all with outfits that greatly increase inelegance. (lab coats) With patience, it's a good method.
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How do you stop radiation in fallout shelter?
Make sure you have plenty of water stored up so that it fight with the radiation effect and brings back you dwellers Health to normal. We recommend keeping your game open till the radiation effect is gone.Does radiation spread in fallout shelter?
Neither. Dwellers in the vault take radiation damage where there isn't enough water. As long there is enough water, you don't have to worry about any radiation. Dwellers in the Wasteland with less than 10 END will take Radiation damage over time.Does radiation go away over time fallout shelter?
Radiation damage also cannot heal naturally and does not reduce over time.Do vault dwellers heal over time?
Your dwellers will recover over time (health and radiation) if you have enough food and water and if they are currently in the vault. If you lack food, your dwellers will lose health slowly. If you lack clean water, your dwellers will get irradiated slowly.What Happens If You Kill All Dwellers? - Fallout Shelter - 2016
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Answer 2
When you log out your vault is still using recourses for some time. Possibly you had just over the min needed water and when you left the water went under the minimum giving all the dwellers radiation. Then when you logged back on you collected more water so you had over the minimum amount so it appeared ok but they had been collecting radiation for a while.
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