3-feet of dirt (or 2-feet of concrete) is all that’s needed to shield you from nuclear fallout radiation.For more information, get the essential book on the topic, Nuclear War Survival Skills. After 28 days, the radiation is so low you can leave the fallout shelter permanently. After two weeks you can leave your shelter for short visits. 49 hours later it’s dropped by a factor of 100. In other words, 7 hours after the blast the radioactivity of the fallout has dropped by a factor of 10. ![]() For each factor of seven increase in time, the radiation from fallout is reduced by a factor of ten. You can measure the half-life of fallout in hours, not years. Most of the material caught-up in a nuclear blast is not naturally radioactive, so it’s temporary charge is very short lived. Within 30 days the radiation is essentially gone – except for a few long living isotopes (variations of strontium and iodine) that will continue to show up for years in certain foods (like milk). The fallout from a nuclear bomb has an incredible short half-life.The most important thing you should know is that nuclear war is totally survivable. Hollywood disagrees – but once you learn a few facts about the fallout from a nuclear bombs you’ll see what I mean. I’ve written about it before and posted tiny fallout shelter designs but today I thought I’d share the basics of nuclear war survival and shelter design – and a small home that would function nicely as a fallout shelter. I’m also an optimist, so went into the study of nuclear war with the hope of finding an answer other than doom. ![]() ![]() So for fun – and maybe as a weird sort of therapy – I started learning about fallout and nuclear war as a teenager. I’m Gen-X and grew up during the cold war. I’ve got a hobby – a weird one – and its the study of fallout shelters and nuclear war survival.
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