Nuklearno oružje - Wikipedia, slobodna enciklopedija

# Nuklearno oružje

### Sa Wikipedije, slobodne enciklopedije

Oblak oblika gljive, nastao nakon bacanja atomske bombe na Nagasaki u Japanu 1945. godine, diže se u visinu od 18 kilometara iznad hipocentra.

Nuklearno oružje

Historija nuklearnog oružja
Nuklearni sukob
Utrka u nuklearnom naoružanju
Dizajn oružja / testiranje
Efekti nuklearnih ekspolozija
Nuklearni projektili
Nuklearno špijuniranje
Širenje / Arsenali

Države
SAD · Rusija · Ujedinjeno Kraljevstvo · Francuska · Kina · Indija · Pakistan · Izrael · Sjeverna Koreja · Južnoafrička republika

Nuklearno oružje je oružje čija razorna snaga potie od nuklearnih reakcija, bilo od fisije ili od mnogo jače fuzije. Kao rezultat, čak i nuklearno oružje sa relativno malim učinkom je značajno jače od najjačeg kovencionalnog eksploziva, takvo je oružje sposobno uništiti ili ozbiljno onesposobiti cijeli grad.

U historiji ratovanja, nuklearna oružja korištena su samo dva puta, oba puta tokom zadnjih dana Drugog svjetskog rata. Prvi događaj desio se ujutro 6. augusta 1945. godine, kada su SAD bacile uranijski eksplozivni uređaj čije je šifrirano ime bilo Little Boy ("mali dječak") na japanski grad Hirošimu. Drugi događaj odigrao se tri dana kasnije kada je plutonijska naprava implozijskog tipa koji je imao šifrirano ime Fat Man ("debeli čovjek") bačena na grad Nagasaki. Upotreba ovih oružja, koja je rezultiralo trenutnom smrću od oko 100 000 do 200 000 pojedinaca (većinom civila) i čak više tokom vremena, bilo je i ostaje kontroverzno. Kritičari su optuživali da su to bila nepotrebna djela masovnog ubijanja, dok su drugi tvrdili da su oni maksimalno smanjili žrtve na objema stranama tako što su ubrzali kraj rata (pogledajte i članak Atomska bombardiranja Hirošimae i Nagasakija za više informacija).

Od tada, nuklearna oružja bila su detonirana više od dvije hiljade puta zbog testiranja i demonstratskih svrha. Jedine poznate zemlje koje su detonirale takvo oružje su SAD, Sovjetski Savez, Ujedinjeno Kraljevstvo, Francuska, Kina, Indija i Pakistan, a od oktobra 2006. godina pridružila im se i Sjeverna Koreja. Ove zemlje su deklarirane nuklearne sile (zajedno sa Rusijom, koja je naslijedila oružje nakon raspada Sovjetskog Saveza).

Mnogobrojne druge zemlje možda posjeduju nuklearno oružje, ali nisu nikada javno priznale posjedovanje, ili njihove tvrdnje da ga ne posjeduju nisu bile potvrđene. Na primjer, Izrael ima savremene avionske sisteme isporuke i izgleda da ima opsežan nuklearni program sa stotinama nuklearnih glava. I Iran je trenutno optužen od brojnih vlada za pokušaje razvijanja nuklearnog oružja, iako njegova vlada tvrdi da su njihove potvrđene nuklearne aktivnosti, kao što je obogaćivanje uranija, za mirnodobne svrhe. U prošlosti se špekulisalo da nuklearno oružje razvijaju, odnosno da ga je testirala, i Južna Afrika u doba apartheida, Švedska, a danas se slične špekulacije vezuju uz Brazil. SFR Jugoslavija je, takođe, započela rad na razvoju nuklearnog oružja, ali je on napušten 1960-ih.

Odvojeno od njihove upotrebe kao oružja, nuklearni eksploziv bio je testiran i korišten u razne ne-vojne svrhe. Sintetičli elementi, kap to je ajnštajnijum, stvoreni su u nuklearnoj fisiji, otkriveni su nakon prvog testa hidrogenske bombe.

## [uredi] Historija

Posljedice atomskog bombardovanja Hirošime.

  Glavni članak: Historija nuklearnog oružja

The first nuclear weapons were created in the United States by an international team, including many displaced scientists from central Europe, with assistance from the United Kingdom and Canada during World War II as part of the top-secret Manhattan Project. While the first weapons were developed primarily out of fear that Nazi Germany would develop them first, they were eventually used against the Japanese cities of Hiroshima and Nagasaki in August 1945. The Soviet Union developed and tested their first nuclear weapon in 1949, based partially on information obtained from Soviet espionage in the United States. Both the U.S. and USSR would go on to develop weapons powered by nuclear fusion (hydrogen bombs) by the mid-1950s. With the invention of reliable rocketry during the 1960s, it became possible for nuclear weapons to be delivered anywhere in the world on a very short notice, and the two Cold War superpowers adopted a strategy of deterrence to maintain a shaky peace.[1]

U.S. and USSR/Russian nuclear weapons stockpiles, 1945-2006.

Nuclear weapons were symbols of military and national power, and nuclear testing was often used both to test new designs as well as to send political messages. Other nations also developed nuclear weapons during this time, including the United Kingdom, France, and China. These five members of the "nuclear club" agreed to attempt to limit the spread of nuclear proliferation to other nations, though four other countries (India, South Africa, Pakistan, and Israel) developed nuclear arms during this time. At the end of the Cold War in the early 1990s, the Russian Federation inherited the weapons of the former USSR, and along with the U.S., pledged to reduce their stockpile for increased international safety. Nuclear proliferation has continued, though, with Pakistan testing their first weapons in 1998, and North Korea performing a test in 2006. In January 2005, Pakistani metallurgist Abdul Qadeer Khan confessed to selling nuclear technology and information of nuclear weapons to Iran, Libya, and North Korea in a massive, international proliferation ring. On October 9, 2006, North Korea claimed it had conducted an underground nuclear test, though the very small apparent yield of the blast has led many to conclude that it was not fully successful (see 2006 North Korean nuclear test).

Nuclear weapons have been at the heart of many national and international political disputes and have played a major part in popular culture since their dramatic public debut in the 1940s and have usually symbolized the ultimate ability of mankind to utilize the strength of nature for destruction.

There have been (at least) four major false alarms, the most recent in 1995, that almost resulted in the U.S. or USSR/Russia launching its weapons in retaliation for a supposed attack.[2] Additionally, during the Cold War the U.S. and USSR came close to nuclear warfare several times, most notably during the Cuban Missile Crisis. As of 2006, there are estimated to be at least 27,000 nuclear weapons held by at least eight countries, 96 percent of them in the possession of the United States and Russia.

## [uredi] Vrste nuklearnog oružja

Dva osnovna dizajna oružja na bazi fisije.

  Glavni članak: Dizajn nuklearnog oružja

There are two basic types of nuclear weapons. The first are weapons which produce their explosive energy through nuclear fission reactions alone. These are known colloquially as atomic bombs, A-bombs, or fission bombs. In fission weapons, a mass of fissile material (enriched uranium or plutonium) is assembled into a supercritical mass—the amount of material needed to start an exponentially growing nuclear chain reaction—either by shooting one piece of subcritical material into another, or by compressing a critical mass with chemical explosives, at which point neutrons are injected and the reaction begins. A major challenge in all nuclear weapon designs is to ensure that a significant fraction of the fuel is consumed before the weapon destroys itself. The amount of energy released by fission bombs can range between the equivalent of less than a ton of TNT upwards to around 500,000 tons (500 kilotons) of TNT.[3]

The second basic type of nuclear weapon produces a large amount of its energy through nuclear fusion reactions, and can be over a thousand times more powerful than fission bombs. These are known as hydrogen bombs, H-bombs, thermonuclear bombs, or fusion bombs. Only six countries—United States, Russia, United Kingdom, People's Republic of China, France, and India—have detonated, or have attempted to detonate, hydrogen bombs. Hydrogen bombs work by utilizing the Teller-Ulam design, in which a fission bomb is detonated in a specially manufactured compartment adjacent to a fusion fuel. The gamma and X-rays emitted by this explosion compress and heat a capsule of tritium, deuterium, or lithium deuteride starting a fusion reaction. Neutrons emitted by this fusion reaction can induce a final fission stage in a depleted uranium tamper surrounding the fusion fuel, increasing the yield considerably as well as the amount of nuclear fallout. Each of these components is known as a "stage", with the fission bomb as the "primary" and the fusion capsule as the "secondary".[3] By chaining together numerous stages with increasing amounts of fusion fuel, thermonuclear weapons can be made to an almost arbitrary yield; the largest ever detonated (the Tsar Bomba of the USSR) released an energy equivalent to over 50 million tons (megatons) of TNT, though most modern weapons are nowhere near that large.

There are other types of nuclear weapons as well. For example, a boosted fission weapon is a fission bomb which increases its explosive yield through a small amount of fusion reactions, but it is not a hydrogen bomb. Some weapons are designed for special purposes; a neutron bomb is a nuclear weapon that yields a relatively small explosion but a relatively large amount of prompt radiation; such a device could theoretically be used to cause massive casualties while leaving infrastructure mostly intact. The detonation of a nuclear weapon is accompanied by a blast of neutron radiation. Surrounding a nuclear weapon with suitable materials (such as cobalt or gold) creates a weapon known as a salted bomb. This device can produce exceptionally large quantities of radioactive contamination. Most variety in nuclear weapon design is in different yields of nuclear weapons for different types of purposes, and in manipulating design elements to attempt to make weapons extremely small.

### [uredi] Nuklearna bomba

Nuklearna bomba jedno je od najrazornijih vrsta oružja. Njen rad bazira se na principu nuklearne fisije. Prva je nuklearna bomba izgrađena tijekom Drugog svjetskog rata kroz tajni projekt Manhattan američke vlade u kojemu su sudjelovali ponajbolji fizičari tadašnjeg svijeta.

Postoje dva osnovna tipa nuklearnih oružja. Prva su oružja koja proizvode svoju eksplozivnu energiju samo putem reakcija nuklearne fisije. Ona su uobičajeno poznata kao atomska bomba ili A-bomba. U fisijskom oružju, masa fisibilnog materijala (obogaćeni uranij ili plutonij) je sklopljena u superkritičnu masu (količina materijala potrebna da započne eksponencijalni rast nuklearne lančane reakcije), bilo izbacivanjem jednog dijela subkritičnog materijala prema drugom, ili kompresijom subkritične mase kemijskim eksplozivima, prilikom čega se ubrizgavaju neutroni i reakcija počinje. Glavni izazov u svim konstrukcijama nuklearnog oružja je osiguravanje da se značajan dio goriva iskoristi prije nego što oružje uništi samo sebe. Količina energije koju oslobode fisijske bombe može imati opseg između ekvivalenata manjih od tone TNT-a prema gore, do oko 500 000 tona (500 kilotona) TNT-a.

### [uredi] Termonuklearna bomba

Termonuklearna bomba je vrsta nuklearnog oružja koje oslobađa veliku količinu energije putem reakcije nuklearne fuzije i može biti više od tisuću puta jača od fisijske bombe. Poznata je još i kao H-bomba, hidrogenska bomba i fuzijska bomba. Samo se za šest zemalja (Sjedinjene Američke Države, Rusija, Francuska, Ujedinjeno Kraljevstvo, Kina i Indija) zna da posjeduju hidrogensku bombu. Hidrogenske bombe rade koristeći Teller-Ulamov dizajn u kome se detonira fisijska bomba, u posebno napravljenom dijelu koji je u blizini fuzijskog goriva. Gama i X-zrake koji se oslobađaju tijekom fisijske eksplozije sažimaju i griju kapsulu u kojoj se nalaze tricij, deuterij ili litij deuterid (LiD), započinjući fuzijsku reakciju. Neutroni oslobođeni tijekom ove fuzijske reakcije započinju konačnu fisijsku fazu u omotaču koji je od osiromašenog uranija i koji okružuje fuzijsko gorivo, povećavajući značajno konačni učinak. Svaka od ovih komponenti je poznata kao "faza", sa fisijskom bombom kao "primarnom" i fuzijskom kapsulom kao "sekundarnom". Povezujući zajedno brojne faze i povećavajući količinu fuzijskog goriva, termonuklearno oružje može imati ogromnu snagu. Najveća bomba koja je ikada detonirana je bila Car bomba u bivšem SSSR-u, koja je imala snagu od preko 50 milijuna tona (megatona) TNT-a, većina modernog oružja nije ni blizu te jačine.

Tu su i drugi tipovi nuklearnog oružja. Na primjer, pojačano fisijsko oružje je fisijska bomba koja povećava svoju eksplozivnu snagu pomoću male količine fuzionih reakcija, ali nije hidrogenska bomba. Neka oružja su dizajnirana za posebne svrhe, neutronska bomba je nuklearno oružje koje daje relativno malu eksploziju, ali sa relativno velikom količinom radijacije. Detonacija nuklearnog oružja je praćena eksplozijom neutronske radijacije. Okruživanjem nuklearnog oružja sa prikladnim materijalima (kao što su kobalt ili zlato) stvara se oružje poznato pod imenom posoljena bomba. Ovaj uređaj može proizvesti izuzetno velike količine radioaktivne kontaminiranosti. Većina razlika u dizajniranju nuklearnog oružja je u različitim korisnim učincima nuklearnog oružja za različite vrste namjena i u manipuliranju konstrukcijskim elementima u pokušaju stvaranja izrazito malog oružja.

## [uredi] Nuklearna strategija

SAD-ov Peacekeeper projektil koristio je MIRV projektile. Svaki projektil mogao je sadžavati i do deset bojnih glava (prikazano u crvenoj boji), a koje su mogle pogoditi različite mete. Ovaj sistem je razvijen za projektilsku odbranu.

  Glavni članak: Nuklearni sukob

Nuklearni sukob je strategija ili ratovanja ili izbjegavanja nuklearnog rata. The policy of trying to ward off a potential attack by a nuclear weapon from another country by threatening nuclear retaliation is known as the strategy of nuclear deterrence. The goal in deterrence is to always maintain a second strike status (the ability of a country to respond to a nuclear attack with one of its own) and potentially to strive for first strike status (the ability to completely destroy an enemy's nuclear forces before they could retaliate). During the Cold War, policy and military theorists in nuclear-enabled countries worked out models of what sorts of policies could prevent one from ever being attacked by a nuclear weapon.

Different forms of nuclear weapons delivery (see below) allow for different types of nuclear strategy, primarily by making it difficult to defend against them and difficult to launch a pre-emptive strike against them. Sometimes this has meant keeping the weapon locations hidden, such as putting them on submarines or train cars whose locations are very hard for an enemy to track, and other times this means burying them in hardened bunkers. Other responses have included attempts to make it seem likely that the country could survive a nuclear attack, by using missile defense (to destroy the missiles before they land) or by means of civil defense (using early warning systems to evacuate citizens to a safe area before an attack). Note that weapons which are designed to threaten large populations or to generally deter attacks are known as "strategic" weapons. Weapons which are designed to actually be used on a battlefield in military situations are known as "tactical" weapons.

There are critics of the very idea of "nuclear strategy" for waging nuclear war who have suggested that a nuclear war between two nuclear powers would result in mutual annihilation. From this point of view, the significance of nuclear weapons is purely to deter war because any nuclear war would immediately escalate out of mutual distrust and fear, resulting in mutually assured destruction. This threat of national, if not global, destruction has been a strong motivation for anti-nuclear weapons activism.

Critics from the peace movement and within the military establishment have questioned the usefulness of such weapons in the current military climate. The use of (or threat of use of) such weapons would generally be contrary to the rules of international law applicable in armed conflict, according to an Advisory opinion issued by the International Court of Justice in 1996.

Možda najkontraverznija ideja u nuklearnoj strategiji je ona o širenju nuklearnog oružja. Ovaj stav govori da, nasuprot konvencionalnom oružju, nuklearno oružje uspješno spriječava otvoreni rat između država, kako je i spriječio u Hladnom ratu između SAD-a i Sovjetskog saveza. Politički naučnik Kenneth Waltz najviše promoviše ove stavove.

## [uredi] Nuklearni projektili

The first nuclear weapons were gravity bombs, such as the "Fat Man" weapon dropped on Nagasaki, Japan. These weapons were very large and could only be delivered by a bomber aircraft.

  Glavni članak: Nuklearni projektili

Nuclear weapons delivery—the technology and systems used to bring a nuclear weapon to its target—is an important aspect of nuclear weapons relating both to nuclear weapon design and nuclear strategy.

Historically the first method of delivery, and the method used in the two nuclear weapons actually used in warfare, is as a gravity bomb, dropped from bomber aircraft. This method is usually the first developed by countries as it does not place many restrictions on the size of the weapon, and weapon miniaturization is something which requires considerable weapons design knowledge. It does, however, limit the range of attack, the response time to an impending attack, and the number of weapons which can be fielded at any given time. Additionally, specialized delivery systems are usually not necessary; especially with the advent of miniaturization, nuclear bombs can be delivered by both strategic bombers and tactical fighter-bombers, allowing an air force to use its current fleet with little or no modification. This method may still be considered the primary means of nuclear weapons delivery; the majority of U.S. nuclear warheads, for example, are represented in free-fall gravity bombs, namely the B61.

More preferable from a strategic point of view are nuclear weapons mounted onto a missile, which can use a ballistic trajectory to deliver a warhead over the horizon. While even short range missiles allow for a faster and less vulnerable attack, the development of intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) has allowed some nations to plausibly deliver missiles anywhere on the globe with a high likelihood of success. More advanced systems, such as multiple independently targetable reentry vehicles (MIRVs) allow multiple warheads to be launched at several targets from any one missile, reducing the chance of any successful missile defense. Today, missiles are most common among systems designed for delivery of nuclear weapons. Making a warhead small enough to fit onto a missile, though, can be a difficult task.

Tactical weapons (see above) have involved the most variety of delivery types, including not only gravity bombs and missiles but also artillery shells, land mines, and nuclear depth charges and torpedoes for anti-submarine warfare. An atomic mortar was also tested at one time by the United States. Small, two-man portable tactical weapons (somewhat misleadingly referred to as suitcase bombs), such as the Special Atomic Demolition Munition, have been developed, although the difficulty to combine sufficient yield with portability limits their military utility.

## [uredi] Vlade, kontrola i zakon

Međunarodna agencija za atomsku energiju osnovana je 1957. godine kako bi podpomogla mirotvorni razvoj nuklearne tehnologije, te kako bi zaustavila širenje nuklearno oružja.

Because of the immense military power they can confer, the political control of nuclear weapons has been a key issue for as long as they have existed. In the late 1940s, lack of mutual trust prohibited the United States and the Soviet Union from making ground towards international arms control agreements, but by the 1960s steps were being taken to limit both the proliferation of nuclear weapons to other countries and the environmental effects of nuclear testing. The Partial Test Ban Treaty (1963) restricted all nuclear testing to underground nuclear testing, to prevent contamination from nuclear fallout, while the Nuclear Non-Proliferation Treaty (1968) attempted to place restrictions on the types of activities which signatories could participate in, with the goal of allowing the transference of non-military nuclear technology to member countries without fear of proliferation. In 1957, the International Atomic Energy Agency (IAEA) was established under the mandate of the United Nations in order to encourage the development of the peaceful applications of nuclear technology, provide international safeguards against its misuse, and facilitate the application of safety measures in its use. In 1996, many nations signed and ratified the Comprehensive Test Ban Treaty which prohibits all testing of nuclear weapons, which would impose a significant hindrance to their development by any complying country.

Additional treaties have governed nuclear weapons stockpiles between individual countries, such as the SALT I and START I treaties, which limited the numbers and types of nuclear weapons between the United States and the U.S.S.R.

Nuclear weapons have also been opposed by agreements between countries. Many nations have been declared Nuclear-Weapon-Free Zones, areas where nuclear weapons production and deployment are prohbited, through the use of treaties. The Treaty of Tlatelolco (1967) prohibited any production or deployment of nuclear weapons in Latin America and the Caribbean, and the Treaty of Pelindaba (1964) prohibits nuclear weapons in many African countries. As recently as 2006 a Central Asian Nuclear Weapon Free Zone was established amongst the former Soviet republics of Central Asia prohibiting nuclear weapons.

In 1996, the International Court of Justice, the highest court of the United Nations, issued an Advisory Opinion concerned with the "Legality of the Threat or Use of Nuclear Weapons". The court ruled that the use or threat of use of nuclear weapons would violate various articles of international law, including the Geneva Conventions, the Hague Conventions, the UN Charter, and the Universal Declaration of Human Rights.

## [uredi] Takođe pogledajte

- Više tehničkih detalja

- - Dizajn nuklearnog oružja
  - Nuclear weapon yield
  - Nuklearna eksplozija
- Historija
  - Historija nuklearnog oružja
  - Projekt Manhattan
  - Nacionalna laboratorija Los Alamos
  - Nacionalna laboratorija Lawrence Livermore
  - Nuklearno testiranje
    - Testno područije u Nevadi
  - Sovjetski projekt razvoja atomske bombe
  - Stanislav Petrov
  - Njemački projekt razvoja nuklearne energije
  - Japaneski atomski projekt
  - Nuklearni i radijaciski incidenti (uključujući i incidente sa nuklearnim oružjem)
- Srodna tehnologija i nauka
  - Nuklearna fizika
  - Nuklearna fisija
  - Nuklearna fuzija
  - Nuklearni reaktor
  - Nuklearno inženjerstvo
- Vojna strategija
  - Nuklearni sukob
  - Civilna odbrana
  - Nuklearna strategija
- Širenje i politika
  - Širenje nuklearnog oružja
  - Sporazum neširenja nuklearnog oružja
  - Nuklearno razoružanje
  - Spisak država sa nuklearnim oružjem
  - Nuklearno oružje i SAD
  - Nuklearno oružje i Ujedinjeno Kraljevstvo
  - Spisak nuklearnog oružja
- Popularna kultura
  - Nuklearno oružje u popularnoj kulturi
- Posljedice
  - Nuklearna zima
  - Nuklearno ljeto

Nuklearna tehnologija
Nuklearni inženjering | Nuklearna fizika | Nuklearna fisija | Nuklearna fuzija | Radioaktivnost | Ionizirajuća radijacija | Atomsko jezgro | Nuklearni reaktor | Nuklearna bezbijednost | Nuklearna hemija
Nuklearni materijal | Nuklearno gorivo | Plodni materijal | Torijum | Uranijum | Obogaćeni uranijum | Osiromašeni uranijum | Plutonijum
Nuklearna snaga | Nuklearnaelektrana | Radioaktivni otpad | Snaga nuklearne fuzije | Budući razvoj energetikw | Reaktor IV generacije | Brzi neutronski reaktor | Reaktor Magnox | Reaktor sa vema visokim tempreaturama | | Nuklearni pogon | Nuklearna termalna raketa | Radioizotopni termoelektrični generator
Nuklearna medicina | PET | Radiološka terapija | Tomoterapija | Protonska terapija | Brahiterapija
Nuklearno oružje | Historija nuklearnog oružja | Nuklearni sukob | Utrka u nuklearnom naoružanju | Dizajn nuklearnog oružja | Efekti nuklearnih eksplozija | Nuklearno testiranje | Nuklearni projektili | Širenje nuklearnog oružja | Spisak država sa nuklearnim oružjem | Spisak nuklearnih testova

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