[@Orior] Corrected it in my post, so that she has no idea if she has more toughness against it.
Also you can be quite resistant to radiation, if your body is already adjusted to it. Ask the creatures that live near Chernobyl and now near Fukushima. They don't die, because they have adjusted to the radiation levels in the area, which would be deadly for us and for normal animals, even of the same species.