The thickness in inches needed to cut the radiation down to only 1/10th of its initial intensity for different common materials is: Steel 3.3″, concrete 11″, earth 16″, water 24″, wood 38″. The thicker and heavier the mass, the more radiation it stops, and the more effective it is with every inch more you add to your fallout shelter. Like police body armor stopping bullets, mass stops (absorbs) radiation. What stops radiation, and thus shields your family, is simply putting mass between them and the radiation source. That is really very good news, because our families can readily survive it IF we get them into a proper shelter to safely wait it out as it becomes less dangerous with every passing hour. Two days later, it’s only 1/100th as strong, or as deadly, as it was initially. For example, fallout emitting gamma ray radiation at a rate over 500 R/hr (fatal with one hour of exposure) shortly after an explosion, weakens to only 1/10th as strong 7 hours later. Radioactive fallout from a nuclear explosion, though very dangerous initially, loses its intensity quickly because it is giving off so much energy. Even if you manage not to inhale or ingest the dust, and keep it off your skin, hair, and clothes, and even if none gets inside your house, the radiation penetrating your home is still extremely dangerous, and can injure or kill you inside. This radiation (not the fallout dust) can go right through walls, roofs and protective clothing. This radioactive fallout ‘dust’ is dangerous because it is emitting penetrating radiation energy (similar to x-ray’s).
However, rain can concentrate the fallout into localized ‘hot spots’ of much more intense radiation with no visible indication. Once it arrives, whether visible or not, all that will fall will have done so usually in under an hour, then blow around everywhere just like dust does on the ground and roofs. The smaller and lighter dust-like particles will typically be arriving hours later, as they drift much farther downwind, often for hundreds of miles. It may begin arriving minutes after an explosion. The heaviest, most dangerous, and most noticeable fallout, will ‘fall out’ first closer to ground zero. It drifts on the wind and most of it settles back to earth downwind of the explosion. Radioactive fallout is the particulate matter (dust) produced by a nuclear explosion and carried high up into the air by the mushroom cloud. You must throw off any self-defeating myths of nuclear un-survivability that may needlessly paralyze and panic, and then seal the fate of, less informed families. The principles of radiation protection are simple – with many options and resources families can use to prepare or improvise a very effective shelter. #5 – SHELTER KI4U Nuke Prep Expertise & Solutions
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