Civil Defense Bunkers - Are They Really Effective?

Shelters are designed to reduce the dose of radiation that people will be exposed to. The ideal is to bury a shelter about ten feet deep in regular earth. But if you can layer on concrete, then even a modicum of concrete will generate a decent protection factor. In a big new york high rise building, and it's a concrete line basement, you're already achieving that kind of a hundred f p f protection level.