Anyone at ground zero, where the fireball goes up, would be incinerated. There is simply no effective protection at ground zero. Up to ¾ of a mile away, anyone exposed would receive a lethal dose of radiation. ... but the basic idea of an above ground nuclear shelter is to build a reinforced dome type structure out of steel and concrete and ...Above ground is probably going to be cheaper to build and easier to rationalize to people who know about it. You can also probably get a better vantage point for surveying the surrounding area. On the other hand, it’s also going to be more visible, more vulnerable to break-in, and more exposed to the elements.

But the truth is that above-ground safe rooms are just as secure as their underground counterparts. Researchers from Texas Tech University claim that there is no evidence of above-ground safe room failures. While underground shelters are certainly an excellent way to protect yourself from a tornado, above-ground units are just as effective. a dose of 300 rems can give you acute radiation sickness and has a 50% probability of being fatal. fallout near ground zero (for a ground blast) is 1000+ rad/hr, lethal dose in 18 minutes or less. fallout at ground zero (for a ground blast) inside a crater and around the rim is 6000+ rad/hr, lethal dose in 3 minutes.

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