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Afallout shelter is an enclosed space specially designated to protect occupants from radioactive debris orfallout resulting from anuclear explosion. Many such shelters were constructed ascivil defense measures during theCold War.
During a nuclear explosion, matter vaporized in the resulting fireball is exposed to neutrons from the explosion, absorbs them, and becomesradioactive. When this material condenses in the rain, it forms dust and light sandy materials that resemble groundpumice. The fallout emitsalpha andbeta particles, as well asgamma rays.
Much of this highly radioactive material falls to Earth, subjecting anything within the line of sight to radiation, becoming a significanthazard. A fallout shelter is designed to allow its occupants to minimize exposure to harmful fallout until radioactivity hasdecayed to a safer level, over a few weeks or months.
A fallout shelter is designed to protect its occupants from:
During theCold War, many countries built fallout shelters for high-ranking government officials and crucial military facilities, such asProject Greek Island and theCheyenne Mountain nuclear bunker in the United States and Canada'sEmergency Government Headquarters. Plans were made, however, to use existing buildings with sturdy below-ground-level basements as makeshift fallout shelters. These buildings wereplacarded with the orange-yellow and blacktrefoil sign designed byUnited States Army Corps of Engineers director of administrative logistics support functionRobert W. Blakeley in 1961.[2]
TheNational Emergency Alarm Repeater (NEAR) program was developed in the United States in 1956 during the Cold War to supplement the existing sirenwarning systems and radio broadcasts in the event of anuclear attack. The NEAR civilian alarm device was engineered and tested but the program was not viable and was terminated in 1967.[3]
In the U.S. in September 1961, under the direction ofSteuart L. Pittman, the federal government started the Community Fallout Shelter Program.[4][5] A letter fromPresident Kennedy advising the use of fallout shelters appeared in the September 1961 issue ofLife magazine.[6] From 1954 to 1961, home fallout shelter sales grew, but eventually there was a public backlash against the fallout shelter as a consumer product and the market collapsed by 1963.[7]
In November 1961, inFortune magazine, an article by Gilbert Burck appeared that outlined the plans ofNelson Rockefeller,Edward Teller,Herman Kahn, andChet Holifield for an enormous network of concrete-lined underground fallout shelters throughout the United States sufficient to shelter millions of people to serve as a refuge in case ofnuclear war.[8]
The United States ended federal funding for the shelters in the 1970s.[9] In 2017, New York City began removing the yellow signs since members of the public are unlikely to find edible food and usable medicine inside those rooms.[10]
TheAtomitat was an underground house inPlainview, Texas: it was designed byJay Swayze and completed in 1962. The house was designed in response to the fear of nuclear war during the Cold War. The house was designed to be an "atomic-habitat" which met theUnited States Civil Defense specifications.[11] It was the first bunker-house to meet their specifications as a nuclear shelter.[12] Swayze also built an underground house for the1964 New York World's Fair: it was called theUnderground World Home.[13]
Similar projects have been undertaken inFinland, which requires all buildings with area over 600 m2 to have an NBC (nuclear-biological-chemical) shelter, andNorway, which requires all buildings with an area over 1000 m2 to have a shelter.[14]
The formerSoviet Union and other Eastern Bloc countries often designed their underground mass-transit and subway tunnels to serve as bomb and fallout shelters in the event of an attack. Currently, the deepest subway line in the world is situated inSt Petersburg inRussia, with an average depth of 60 meters, while the second deepest subway station isArsenalna inKyiv, at 105.5 meters.[15]
Germany has protected shelters for 3% of its population,Austria for 30%,Finland for 70%,Sweden for 81%,[16] and Switzerland for 114%.[17]
TheArmijska Ratna Komanda D-0, also known as the Ark,[18] was a Cold War-era nuclear bunker and military command centre located near the town ofKonjic[19] inBosnia and Herzegovina.[20] Built to protectYugoslav PresidentJosip Broz Tito and up to 350 members of his inner circle[18] in the event of anatomic exchange, the structure is made up of residential areas, conference rooms, offices, strategic planning rooms, and other areas.[20] The bunker remained a state secret until after thebreakup of Yugoslavia in the 1990s.[21]
The facility is now under the authority of theBosnian Ministry of Defense and is managed by the country'smilitary, guarded by a five-soldier detachment,[18] but is designated byKONS asNational Monuments of Bosnia and Herzegovina and used as exhibition space for project such as Cultural Event of Europe with strong UNESCO support, and tourist attraction.[20]
Another underground facility isŽeljava Air Base, situated on the border between Bosnia and Herzegovina andCroatia under theGola Plješevica mountain, near the city ofBihać. It was the largestundergroundairport andmilitary air base in theSocialist Federal Republic of Yugoslavia (SFRY), and one of the largest in Europe. The role of the facility was to establish, integrate and coordinate a nationwideearly warning radar network in SFRY akin toNORAD in the US. The complex contained tunnels in total length of 3.5 km (2.2 mi), and the bunker with four entrances protected by 100-ton pressurized doors, three of which were customized for use byfixed-wing aircraft. capable in housing two full fightersquadrons, one reconnaissance squadron, and associated maintenance facilities. It was designed and built to sustain a direct hit from a 20-kilotonnuclear bomb, equivalent to that dropped onNagasaki. The underground facility was lined with semicircular concrete shields, arranged every 10 km (6.2 mi), to cushion the impact of incoming strike. The complex included an underground water source, power generators, crew quarters, and other strategic military facilities. It also housed amess hall that could feed 1,000 people simultaneously, along with stores of food, fuel and arms sufficient to last 30 days. Fuel was supplied by a 20 km (12 mi) underground pipe network connected to a military warehouse on Pokoj Hill nearBihać. Nowadays, they are popular forurban exploration.[22][23][24]
Switzerland built an extensive network of fallout shelters, not only through extra hardening of government buildings such as schools, but also through a building regulation requiring nuclear shelters in residential buildings since the 1960s (the first legal basis in this sense dates from 4 October 1963).[25] Later, the law ensured that all residential buildings built after 1978 contained a nuclear shelter able to withstand a blast from a 12-megaton explosion at a distance of 700 metres.[26] TheFederal Law on the Protection of the Population and Civil Protection still requires that every inhabitant should have a place in a shelter close to where they live.[17]
The Swiss authorities maintained large communal shelters (such as the Sonnenberg Tunnel until 2006) stocked with over four months of food and fuel.[26] The referenceNuclear War Survival Skills declared that, as of 1986, "Switzerland has the best civil defense system, one that already includes blast shelters for over 85% of all its citizens."[27] As of 2006, there were about 300,000 shelters built in private residences, institutions and hospitals, as well as 5,100 public shelters for a total of 8.6 million places, a level of coverage equal to 114% of the population.[17]
In Switzerland, most residential shelters are no longer stocked with the food and water required for prolonged habitation and a large number have been converted by the owners to other uses (e.g.,wine cellars, ski rooms,gyms),[26] but a legal obligation to ensure that the shelters are properly maintained remains in effect.[17]
In the United Kingdom, a network of fallout shelters were built across the country for use by theRoyal Observer Corps in its nuclear reporting role.[28] Other shelters were built for the purposes of theROTOR radar system[29] and theregional seat of government scheme.[30] ThePindar complex in London is intended to provide its inhabitants with fallout protection in the event of nuclear attack,[31] as was the earlierCentral Government War Headquarters in Corsham.[32]
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A basic fallout shelter consists of shields that reduce gamma ray exposure by a factor of 1000. The required shielding can be accomplished with 10 times thethickness of any quantity of material capable of cutting gamma ray exposure in half. Shields that reduce gamma ray intensity by 50% (1/2) include 1 centimetre (0.4 in) of lead, 6 cm (2.4 in) of concrete, 9 cm (3.5 in) of packed earth or 150 metres (500 ft) of air. When multiple thicknesses are built, the shielding multiplies. Thus, a practical fallout shield is ten halving-thicknesses of packed earth, reducing gamma rays by approximately 1024 times (210).[33]
Usually, an expedient purpose-built fallout shelter is a trench; with a strong roof buried by 1 m (3 ft) of earth. The two ends of the trench have ramps or entrances at right angles to the trench, so that gamma rays cannot enter (they can travel only in straight lines). To make the overburden waterproof (in case of rain), a plastic sheet may be buried a few inches below the surface and held down with rocks or bricks.[34]
Blast doors are designed to absorb the shock wave of a nuclear blast, bending and then returning to their original shape.[35]
Dry earth is a reasonably good thermal insulator, but over several weeks of habitation, a shelter will become dangerously hot.[36] The simplest form of effective fan to cool a shelter is a wide, heavy frame with flaps that swing in the shelter's doorway and can be swung from hinges on the ceiling. The flaps open in one direction and close in the other, pumping air. (This is aKearny air pump, or KAP, named after the inventor,Cresson Kearny.)
Unfiltered air is safe, since the most dangerous fallout has the consistency of sand or finely ground pumice.[36] Such large particles are not easily ingested into the soft tissues of the body, so extensive filters are not required. Any exposure to fine dust is far less hazardous than exposure to the fallout outside the shelter. Dust fine enough to pass the entrance will probably pass through the shelter.[36] Some shelters, however, incorporateNBC-filters for additional protection.
Effective public shelters can be the middle floors of some tall buildings or parking structures, or below ground level in most buildings with more than 10 floors. The thickness of the upper floors must form an effective shield, and the windows of the sheltered area must not view fallout-covered ground that is closer than 1.5 km (1 mi). One of Switzerland's solutions is to use road tunnels passing through the mountains, with some of these shelters being able to protect tens of thousands.[37]
Fallout shelters are not always underground. Above ground buildings with walls and roofs dense enough to afford a meaningfulprotection factor can be used as a fallout shelter.[38]
A battery-powered radio may be helpful to get reports of fallout patterns and clearance. However, radio and other electronic equipment may be disabled byelectromagnetic pulse. For example, even at the height of the Cold War,EMP protection had been completed for only 125 of the approximately 2,771 radio stations in the United StatesEmergency Broadcast System. Also, only 110 of 3,000 existing Emergency Operating Centers had been protected against EMP effects.[39] The Emergency Broadcast System has since been supplanted in the United States by theEmergency Alert System.
The referenceNuclear War Survival Skills includes the following supplies in a list of "Minimum Pre-Crisis Preparations": one or more shovels, a pick, a bow-saw with an extra blade, a hammer, and 0.1 mm (4 mils) polyethylene film (also any necessary nails, wire, etc.); a homemade shelter-ventilating pump (aKAP); large containers for water; a plastic bottle of sodium hypochlorite bleach; one or twoKFMs (Kearny fallout meters) and the knowledge to operate them; at least a 2-week supply of compact, nonperishable food; an efficient portable stove; wooden matches in a waterproof container; essential containers and utensils for storing, transporting, and cooking food; a hose-vented 20 litres (5 US gal) can, with heavy plastic bags for liners, for use as a toilet; tampons; insect screen and fly bait; any special medications needed by family members; purepotassium iodide, a 60 mL (2 US fl oz) bottle, and a medicine dropper; a first-aid kit and a tube of antibiotic ointment; long-burning candles (with small wicks) sufficient for at least 14 nights; anoil lamp; a flashlight and extra batteries; and a transistor radio with extra batteries and a metal box to protect it from electromagnetic pulse.[40]
Inhabitants should have water on hand, 4–8 litres (1–2 US gal) per person per day. Water stored in bulk containers requires less space than water stored in smaller bottles.[41]
Commercially madeGeiger counters are expensive and require frequent calibration. It is possible to construct anelectrometer-type radiation meter called theKearny fallout meter, which does not require batteries or professional calibration, from properly-scaled plans with just a coffee can or pail, gypsum board,monofilament fishing line, and aluminum foil.[42] Plans are freely available in the public domain in the referenceNuclear War Survival Skills byCresson Kearny.[43]
Inhabitants should plan to remain sheltered for at least two weeks (with an hour out at the end of the first week – see Swiss Civil Defense guidelines), then work outside for gradually increasing amounts of time, to four hours a day at three weeks. The normal work is to sweep or wash fallout into shallow trenches to decontaminate the area. They should sleep in a shelter for several months. Evacuation at three weeks is recommended by official authorities.[citation needed]
If available, inhabitants may takepotassium iodide at the rate of 130 mg/day per adult (65 mg/day per child) as an additional measure to protect the thyroid gland from the uptake of dangerous radioactive iodine, a component of most fallout and reactor waste.[44]
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In the vast majority of accidents, and in allatomic bomb blasts, the threat due to beta and gamma emitters is greater than that posed by the alpha emitters in the fallout. Alpha particles are identical to a helium-4 nucleus (two protons and two neutrons), and travel at speeds in excess of 5% of the speed of light.Alpha particles have little penetrating power; most cannot penetrate through human skin. Avoiding direct exposure with fallout particles will prevent injury from alpha radiation.[46]
Beta radiation consists of particles (high-speed electrons) given off by some fallout. Most beta particles cannot penetrate more than about 3 metres (10 ft) of air or about3 mm (1⁄8 in) of water, wood, or human body tissue; or a sheet of aluminum foil. Avoiding direct exposure with fallout particles will prevent most injuries from beta radiation.[47]
The primary dangers associated with beta radiation are internal exposure from ingested fallout particles and beta burns from fallout particles no more than a few days old.Beta burns can result from contact with highly radioactive particles on bare skin; ordinary clothing separating fresh fallout particles from the skin can provide significant shielding.[47]
Gamma radiation penetrates further through matter than alpha or beta radiation. Most of the design of a typical fallout shelter is intended to protect against gammarays. Gamma rays are better absorbed by materials with high atomic numbers and high density, although neither effect is important compared to the total mass per area in the path of the gamma ray. Thus, lead is only modestly better as a gamma shield than an equal mass of another shielding material such as aluminum, concrete, water or soil.
Some gamma radiation from fallout will penetrate into even the best shelters. However, the radiation dose received while inside a shelter can be significantly reduced with proper shielding. Ten halving thicknesses of a given material can reduce gamma exposure to less than1⁄1000 of unshielded exposure.[48]
The bulk of theradioactivity in nuclear accident fallout is more long-lived than that in weapons fallout. A good table of thenuclides, such as that provided by theKorean Atomic Energy Research Institute, includes thefission yields of the different nuclides. From this data it is possible to calculate the isotopic mixture in the fallout (due tofission products in bomb fallout).[citation needed]
While a person's home may not be a purpose-made shelter, it could be thought of as one if measures are taken to improve the degree offallout protection.
The main threat ofbeta radiation exposure comes fromhot particles in contact with or close to the skin of a person. Also, swallowed or inhaled hot particles could causebeta burns. As it is important to avoid bringing hot particles into the shelter, one option is to remove one's outer clothing, or follow otherdecontamination procedures, on entry. Fallout particles will cease to be radioactive enough to cause beta burns within a few days following a nuclear explosion. The danger of gamma radiation will persist for far longer than the threat of beta burns in areas with heavy fallout exposure.[49]
The gamma dose rate due to the contamination brought into the shelter on the clothing of a person is likely to be small (by wartime standards) compared togamma radiation that penetrates through the walls of the shelter.[49] The following measures can be taken to reduce the amount of gamma radiation entering the shelter:
Fallout shelters feature prominently in theRobert A. Heinlein novelFarnham's Freehold (Heinlein built a fairly extensive shelter near his home inColorado Springs in 1963),[51]Pulling Through byDean Ing,A Canticle for Leibowitz byWalter M. Miller andEarth byDavid Brin.
The 1961Twilight Zone episode "The Shelter", from aRod Serling script, deals with the consequences of actually using a shelter. Another episode of the series called "One More Pallbearer" featured a fallout shelter owned by a millionaire. The1985 adaption of the series had the episode "Shelter Skelter" that featured a fallout shelter.
In 1973, British rock bandThe Who called their tour Fallout Shelter.
In theOnly Fools and Horses episode "The Russians are Coming", aired in 1981, Derek Trotter buys a lead fallout shelter, then decides to construct it in fear of an impending nuclear war caused by the Soviet Union.
In 1999, the filmBlast from the Past was released. It is aromantic comedy film about anuclear physicist, his wife, and son that enter a well-equipped, spacious fallout shelter during the 1962Cuban Missile Crisis. They do not emerge until 35 years later, in 1997. The film shows their reaction to contemporary society.
TheFallout series of computer games depicts the remains of human civilization after an immensely destructive global nuclear war; the United States of America had built underground fallout shelters known as vaults, that were advertised to protect the population against a nuclear attack, but almost all of them were in fact meant to luresubjects for long-termhuman experimentation.
Paranoia, a role-playing game, takes place in a city-sized fallout shelter, which has become ruled by an insane computer.
An episode of the sitcomMalcolm in the Middle features a subplot revolving around Reese and Dewey discovering a previously unknown fallout shelter in their backyard and trapping their father Hal in it, who soon becomes smitten with the shelter's 1960s decor.
TheMetro 2033 book series by Russian authorDmitry Glukhovsky depicts survivors' life in the subway systems below Moscow and Saint-Petersburg after a nuclear exchange between the Russian Federation and the United States of America.
Fallout shelters are often featured on the reality television showDoomsday Preppers.[52]
TheSilo series of novellas byHugh Howey feature extensive fallout-style shelters that protect the inhabitants from an initially unknown disaster.
The 2019 US filmThe Tomorrow Man centers around a reclusive man whose main preoccupation is tending to his in-home fallout shelter and the conspiracy theories that could put it to use.
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The 3-foot thickness of earth shown (or a 2-foot thickness of concrete) will provide an effective barrier, attenuating (absorbing) about 99.9%, of all gamma rays from fallout." "A right-angle turn, either from a vertical or horizontal entry, causes a reduction of about 90%." "...a large piece of 4-mil-thick polyethylene was placed over the mound. This waterproof material served as a "buried roof" after it was covered with more earth.
