How to Survive a Nuclear Attack originated by:Anonymous, The Gulf of Obama, Bananagirl, Babytealeaf (see all)
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Hydrogen bomb detonation.
Hydrogen bomb detonation.
The Cold War ended over two decades ago, and many people have never lived under the shadow of nuclear annihilation. Still, a nuclear attack is a very real threat. Global politics are far from stable, and human nature has changed none in the last two decades. "The most persistent sound which reverberates through man's history is the beating of war drums".[1] As long as nuclear weapons exist, there is always the danger they will be used.
Is nuclear war survivable? Only predictions exist, as some say yes, others say no. For some, especially those in large population centers, it may seem like an entirely futile endeavor.[2] If it is survived at all, it will be by those who are mentally and logistically prepared for such an event. What should you do? Where should you take shelter?
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Keep an eye on the news. A nuclear attack will unlikely come out of the blue from an enemy nation. Such an attack would likely be preceded by a deteriorating political situation. A war with conventional weapons between nations that both have nuclear weapons, if not ended swiftly, may escalate towards nuclear war; and even limited nuclear strikes in one region carry the likelihood to escalate towards an all-out nuclear war elsewhere.[3]

However, an unconventional nuclear attack by terrorists could come without warning. Given the lack of a credible sovereign enemy, such attacks are very unlikely to escalate to a full nuclear exchange.

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Many countries have a rating system to denote the imminence of attack. In the USA and Canada, for example, you should know the DEFCON (DEFense CONdition) level:

DEFCON 5. Normal peacetime readiness
DEFCON 4. Normal increased readiness, increased intelligence and national security measures. (Cold War.)
DEFCON 3. Increased force readiness above normal, American radio call-signs are changed to classified call-signs. Air Force ready to mobilize in less than 15min.
DEFCON 2. Increase in force readiness, just below maximum. All forces ready to mobilize and deploy within 6hrs. (Declared only once during the Cuban Missile Crisis.)
DEFCON 1. Maximum force readiness; the use of nuclear weapons has been authorized. This has never been used for the national condition, though at times certain military units were placed at DEFCON 1, for certain conflicts. [4]
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Learn about the different types of nuclear weapons.:

Fission (A-Bombs) are the most basic nuclear weapon and are incorporated into the other weapon classes. This bomb's power comes from splitting heavy nuclei (plutonium and uranium) with neutrons; as the uranium or plutonium split each atom releases great amounts of energy - and more neutrons. The daughter neutrons cause an extremely fast nuclear chain reaction.

Fission bombs are the only type of nuclear bomb used in war so far. The development of fusion bombs has relegated the 'straight fission' bomb to history. All weaponized nations now possess Fusion bombs.
Fusion (H-Bombs), using the incredible heat of a fission bomb 'spark plug', compress and heat deuterium and tritium (isotopes of hydrogen) which fuse, releasing immense amounts of energy. Fusion weapons are also known as thermonuclear weapons since high temperatures are required to fuse deuterium and tritium; such weapons are usually many times more powerful than the bombs that destroyed Nagasaki and Hiroshima.
EMP Weapons. A nuclear weapon detonated at a very high altitude will generate an electromagnetic pulse so powerful that it can destroy electronic and electrical devices. Placing radios, flashlights in a SEALED metal container (a "Faraday cage") may protect from EMP, providing the items being protected are not in contact with the enclosure. The metal shield must surround the protected item completely - and it helps if it is grounded.

The items to be protected should be insulated from the conductive shell, since the EMP field washing over the shield can still induce voltages in solid state circuit boards. A metalized "space blanket" (costing about $2.00 USD) wrapped securely around a device wrapped in newspaper or cotton may act as an ineffective Faraday shield, helpful if one is far from the blast.

Another method is to wrap a cardboard box copper, or aluminum foil. Place the item in there and plug the device into the ground.
Other Types. Nuclear science is kept secret for reasons of national security, so this list is not neccessarily exhaustive. Outside of science fiction, real scientists have speculated ways to create EMP weapons without nuclear blasts, create Cobalt-Salted ("Neutron") bombs to increase immediate radiation presence, and possibly other types.
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Seek shelter immediately. Aside from the geopolitical warning signs, your first warnings of an imminent nuclear attack will most likely be an alarm or warning signal; if not, it will be the blast itself. The bright light from a detonation of a nuclear weapon can be seen tens of miles away from ground zero. If within the vicinity of the blast (or ground zero), your chances of survival are virtually nonexistent unless you are in a shelter that provides a very (VERY) good blast protection. If you are a few miles out, you will have about 10-15 seconds until the heat wave hits you, and maybe 20-30 seconds until the shockwave does. Under no circumstances should you look directly at the fireball. On a clear day, this can cause temporary blindness at very large distances.[5]

If you can't find shelter, seek a depressed area nearby and lay face down, exposing as little skin as possible. If there is no shelter of this kind, dig as fast as possible. Even around 8 kilometers (5 miles) you will suffer third degree thermal-burns; still at 32 kilometers (20 miles) the heat can burn the skin off your body. The wind itself will peak at around 960 kilometers per hour (600mph) and will level anything or anybody caught in the open.
Failing the above options, get indoors, if, and only if, you can be sure that the building will not suffer significant blast and heat damage. This will, at least, provide some protection against radiation. Whether this will be a viable option depends on the construction of the building and how close you will be to the likely ground zero of a nuclear strike. Stay well away from any windows, preferably in a room without one; even if the building does not suffer substantial damage, a nuclear explosion will blow out windows at enormous distances.[6]
If residing in Switzerland or Finland, check if your home has an atomic shelter. If not, determine where your village/town/district atomic shelter is and know how to get there. Remember: anywhere in Switzerland, you'll be able to find an atomic shelter. When the sirens sound in Switzerland, you are advised to inform those who may not be able to hear it (e.g. the deaf) and then listen to the National Radio Services (RSR, DRS and/or RTSI).
Don't be surrounded by anything flammable or combustible. Substances like nylon or any oil based material will ignite from the heat.
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Remember: it's not the initial blast that creates the high death toll; it's radiation exposure. There are two threats of radiation:

Initial (prompt) radiation. This is radiation released at the moment of detonation, and it is short-lived and travels short distances. With the large yields of modern nuclear weapons, it is thought that this will kill few who would not be killed by the blast or heat at the same distance.[7]
Residual radiation. Known as radiation fallout. If the detonation was a surface blast or the fireball hits the earth, large amounts of fallout occurs. The dust and debris kicked into the atmosphere rains down, bringing with it dangerous amounts of radiation. The fallout may rain down as contaminated black soot known as "black rain," which is very fatal and may be of extreme temperature. Fallout will contaminate anything it touches.

Once you have survived the blast and the initial radiation (for now at least; radiation symptoms have an incubation period), you must find protection against the burning black soot.
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Know the types of radiation particles. Before we continue, we should mention the three different types:

Alpha particles. These are the weakest and, during an attack, are virtually non-existent as a threat. Alpha particles will survive for only a couple inches in the air before they are absorbed by the atmosphere. They possess a minuscule threat from the exterior, however, they will be fatal if ingested or inhaled. Standard clothing will help protect you from Alpha particles.
Beta particles: These are faster than Alpha particles and can penetrate further. They will travel for up to 10 meters (10 yards) before they are absorbed into the atmosphere. Exposure to beta particles is not fatal unless exposed for prolonged periods; which may cause "Beta burns," almost like painful sunburn. They pose a serious threat, however, to the eyes, should they be exposed for a prolonged period. Once again this is harmful if ingested or inhaled, and clothing will help prevent Beta burns.
Gamma Rays. Gamma Rays are the deadliest. They can travel for nearly a mile in the air and penetrate just about any kind of shielding. Therefore gamma radiation will cause severe damage to the internal organs even as an external source. Sufficient shielding will be required.

A shelter's PF against radiation will tell you how many times less a person inside the shelter will receive radiation compared to open space. For example, RPF 300 means that you will receive 300 times less radiation in the shelter than in the open.
Avoid exposure to Gamma radiation. Try not to spend more than 5 minutes exposed. If you are in a rural area, try finding a cave, or a fallen log into which you can crawl. Otherwise just dig a trench to lie in, with stacked earth around you.
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Begin reinforcing your shelter from the inside by stacking dirt around the walls or anything else you can find. If in a trench, then create a roof, but only if materials are nearby; don't expose yourself when not necessary. Canvas from a parachute or tent will help stop fallout debris from piling on you, though it will not stop Gamma rays. It is impossible, at a very fundamental physical level, to completely shield from all radiation. It can only be reduced to a tolerable level. Use the following to help you determine the amount of material you'll need to reduce radiation penetration to 1/1000:[8]

Steel: 21 cm (0.7 feet)
Rock: 70-100 cm (2-3 ft)
Concrete: 66 cm (2.2 ft)
Wood: 2.6 m (8.8 ft)
Soil: 1 m (3.3 ft)
Ice: 2 m (6.6 ft)
Snow: 6 m (20-22 ft)
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Plan on staying in your shelter for a minimum of 200 hours (8-9 days). Under no circumstances leave the shelter in the first forty-eight hours .[9]
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Ration your supplies. You will need to ration to survive, obviously; therefore you will eventually expose yourself to the radiation (unless you are in a specific shelter with food and water).

Processed foods are okay to eat, so long as the container has no punctures and is relatively intact.
Animals may be eaten but, they must be skinned carefully with the heart, liver and kidneys discarded. Try not to eat meat that is close to the bone, for bone marrow retains radiation.

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Plants in a "hot zone" are edible; those with edible roots or undergrowth (carrots, potatoes...) are highly recommended. Use an edibility test on the plants. See How to Test if a Plant Is Edible.
Open water may have received fallout particles and is harmful. Water from an underground source, such as a spring or covered well, is your best bet. (Consider making a basic pit-style solar still, as described in How to Make Water in the Desert.) Use water from streams and lakes only as a last resort. Create a filter by digging a hole about 1ft from the bank and drawing the water which seeps in. It may be cloudy or muddy so allow the sediments to sit, then boil the water to ensure safety from bacteria. If in a building, the water is usually safe. If there is no water (there most likely won't be), use the water already in the pipes by opening the faucet at the highest point of the house to let in air, then open a faucet at the lowest point of the house to drain the water.

See also How to Get Emergency Drinking Water from a Water Heater.
Know How to Purify Water.
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Wear all clothing (hats, gloves, goggles, closed sleeve shirt, etc.), especially when outside to help prevent Beta burns. Decontaminate by shaking your clothes constantly and washing, with water, any exposed skin; settled residue will eventually cause burns.
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Treat radiation and thermal burns.

Minor Burn. Also known as a Beta burn (though it may be from other particles). Immerse Beta burns in cold water until the pain subsides (usually 5 minutes).

If skin starts to blister, char or break; wash it with cold water to remove contaminants, then cover with a sterile compress to prevent infection. Do not break the blisters!
If the skin does not blister, char or break; don't cover it, even if it covers a large portion of the body (almost like sunburn). Instead, wash the area and cover it with Vaseline or a solution of baking powder and water if available. But, moist (uncontaminated) earth will do.
Severe Burn. Known as a thermal burn, as it comes mostly from the high intensity blast heat, rather than ionizing particles, though it can be from the latter. This can be life threatening; everything becomes a factor: water loss, shock, lung damage, infection, etc. Follow these steps to treat a severe burn.

Protect burns from further contamination.
If clothing covers the burn area, gently cut and remove the cloth from the burn. DO NOT try to remove cloth which has stuck or fused onto the burn. DO NOT try to pull clothes over the burn. DO NOT put any ointment on the burn.
Gently wash the burned area with water ONLY.
Put a sterile dressing over the burnt area. In a mass casualty situation, a clean sheet may be used instead.
Prevent shock. Shock is the inadequate flow of blood to the vital tissues and organs. If untreated, it can be fatal. Shock results from excessive blood loss, deep burns, or reactions to the sight of a wound or blood. The signs are restlessness, thirst, pale skin and rapid heartbeat. Sweating may occur even if the skin feels cool and clammy. As it worsens, they breathe short fast gasps, with a vacant stare. To treat: maintain proper heartbeat and respiration by massaging the chest and positioning the person for adequate respiration. Loosen any constrictive clothing and reassure the person. Be firm yet gentle with self confidence.
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Feel free to assist people with radiation sickness, also called Radiation Syndrome. This is not contagious, and everything depends on the amount of radiation one recieved. Here is a condensed version of the table:

Less than 5 REM. No visible symptoms.
5-50 REM. REM = Roentgen equivalent man. 1 REM = ~1 Roentgen. Temporarily decreased red blood cell count.
50-100 REM. Decreased production of immunity cells; susceptible to infections; nausea, headache, and vomiting may be common. This amount of radiation is usually survivable without any medical treatment-
150-300 REM. 35% percent of exposed die within 30 days. (LD 35/30) Nausea, vomiting, and loss of hair all over the body.
300-400 REM Severe radiation poisoning, 50% fatality after 30 days (LD 50/30). Other symptoms are similar to the 2–3 Sv dose, with uncontrollable bleeding in the mouth, under the skin and in the kidneys (50% probability at 4 Sv) after the latent phase.
400-600 REM Acute radiation poisoning, 60% fatality after 30 days (LD 60/30). Fatality increases from 60% at 4.5 Sv to 90% at 6 Sv (unless there is intense medical care). Symptoms start half an hour to two hours after irradiation and last for up to 2 days. After that, there is a 7 to 14 day latent phase, after which generally the same symptoms appear as with 3-4 Sv irradiation, with increased intensity. Female sterility is common at this point. Convalescence takes several months to a year. The primary causes of death (in general 2 to 12 weeks after irradiation) are infections and internal bleeding.
600-1000 REM Acute radiation poisoning, near 100% fatality after 14 days (LD 100/14). Survival depends on intense medical care. Bone marrow is nearly or completely destroyed, so a bone marrow transplant is required. Gastric and intestinal tissue are severely damaged. Symptoms start 15 to 30 minutes after irradiation and last for up to 2 days. Subsequently, there is a 5 to 10 day latent phase, after which the person dies of infection or internal bleeding. Recovery would take several years and probably never complete. Devair Alves Ferreira received a dose of approximately 7.0 Sv (700 REM) during the Goiânia accident and survived, partially due to his fractionated exposure.
1200-2000 REM. Death is 100% at this stage; symptoms appear immediately. The gastrointestinal system is completely destroyed. Uncontrollable bleeding from the mouth, under the skin and the kidneys occurs. Fatigue and general illness takes its toll. Symptoms are the same as before with increased intensity. Recovery not possible.
More than 2000 REM. The same symptoms set in instantly, with increased intensity, then cease for several days in the "walking ghost" phase. Suddenly, gastrointestinal cells are destroyed, with a loss of water and excessive bleeding. Death begins with delirium and insanity. When the brain can't control bodily functions like breathing or blood-circulation, one dies. No medical therapy can reverse this; medical help is for comfort only.
Unfortunately, you have to accept that a person may soon die. Though harsh, don't waste rations or supplies on those dying of radiation sickness. Keep rations for the fit and healthy, should supplies be in demand. Radiation sickness is prevalent among the very young, the old or sick.
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Most likely, a nuclear attack will not be a singular event. Be prepared for another strike or strikes by enemy nations, or an invasion by the attacking party.

1.
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Be prepared for another blast. Keep your shelter intact, unless the materials used are absolutely necessary for survival. Collect any excess clean water and food that is available.
However, if the attacking nation does attack again, it will likely be in another part of the country. If all else fails, live in a cave.

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