Atomic Age

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An early nuclear power plant that used atomic energy to generate electricity. Trojan1.jpg
An early nuclear power plant that used atomic energy to generate electricity.

The Atomic Age, also known as the Atomic Era, is the period of history following the detonation of the first nuclear ("atomic") bomb, Trinity , on July 16, 1945, during World War II. Although nuclear chain reactions had been hypothesized in 1933 and the first artificial self-sustaining nuclear chain reaction (Chicago Pile-1) had taken place in December 1942, [1] the Trinity test and the ensuing bombings of Hiroshima and Nagasaki that ended World War II represented the first large-scale use of nuclear technology and ushered in profound changes in sociopolitical thinking and the course of technology development.

Trinity (nuclear test) code name for the first nuclear detonation

Trinity was the code name of the first detonation of a nuclear weapon. It was conducted by the United States Army at 5:29 a.m. on July 16, 1945, as part of the Manhattan Project. The test was conducted in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico, on what was then the USAAF Alamogordo Bombing and Gunnery Range, now part of White Sands Missile Range. The only structures originally in the vicinity were the McDonald Ranch House and its ancillary buildings, which scientists used as a laboratory for testing bomb components. A base camp was constructed, and there were 425 people present on the weekend of the test.

World War II 1939–1945 global war

World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries—including all the great powers—eventually formed two opposing military alliances: the Allies and the Axis. A state of total war emerged, directly involving more than 100 million people from over 30 countries. The major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. World War II was the deadliest conflict in human history, marked by 50 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, the genocide of the Holocaust, strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war.

Nuclear chain reaction one single nuclear reaction causes more subsequent nuclear reactions

A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, this leading to the possibility of a self-propagating series of these reactions. The specific nuclear reaction may be the fission of heavy isotopes. The nuclear chain reaction releases several million times more energy per reaction than any chemical reaction.


While atomic power was promoted for a time as the epitome of progress and modernity, [2] entering into the nuclear power era also entailed frightful implications of nuclear warfare, the Cold War, mutual assured destruction, nuclear proliferation, the risk of nuclear disaster (potentially as extreme as anthropogenic global nuclear winter), as well as beneficial civilian applications in nuclear medicine. It is no easy matter to fully segregate peaceful uses of nuclear technology from military or terrorist uses (such as the fabrication of dirty bombs from radioactive waste), which complicated the development of a global nuclear-power export industry right from the outset.

Nuclear power power generated from sustained nuclear fission

Nuclear power is the use of nuclear reactions that release nuclear energy to generate heat, which most frequently is then used in steam turbines to produce electricity in a nuclear power plant. As a nuclear technology, nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced by nuclear fission of uranium and plutonium. Nuclear decay processes are used in niche applications such as radioisotope thermoelectric generators. Generating electricity from fusion power remains at the focus of international research. This article mostly deals with nuclear fission power for electricity generation.

Nuclear warfare conflict or strategy in which nuclear weaponry is used to inflict damage on an opponent

Nuclear warfare is a military conflict or political strategy in which nuclear weaponry is used to inflict damage on the enemy. Nuclear weapons are weapons of mass destruction; in contrast to conventional warfare, nuclear warfare can produce destruction in a much shorter time and can have a long-lasting radiological warfare result. A major nuclear exchange would have long-term effects, primarily from the fallout released, and could also lead to a "nuclear winter" that could last for decades, centuries, or even millennia after the initial attack. Some analysts dismiss the nuclear winter hypothesis, and calculate that even with nuclear weapon stockpiles at Cold War highs, although there would be billions of casualties, billions more rural people would nevertheless survive. However, others have argued that secondary effects of a nuclear holocaust, such as nuclear famine and societal collapse, would cause almost every human on Earth to starve to death.

Cold War State of geopolitical tension after World War II between powers in the Eastern Bloc and the Western Bloc

The Cold War was a period of geopolitical tension between the Soviet Union with its satellite states, and the United States with its allies after World War II. A common historiography of the conflict begins with 1946, the year U.S. diplomat George F. Kennan's "Long Telegram" from Moscow cemented a U.S. foreign policy of containment of Soviet expansionism threatening strategically vital regions, and ending between the Revolutions of 1989 and the 1991 collapse of the USSR, which ended communism in Eastern Europe. The term "cold" is used because there was no large-scale fighting directly between the two sides, but they each supported major regional conflicts known as proxy wars.

In 1973, concerning a flourishing nuclear power industry, the United States Atomic Energy Commission predicted that, by the turn of the 21st century, one thousand reactors would be producing electricity for homes and businesses across the U.S. However, the "nuclear dream" fell far short of what was promised because nuclear technology produced a range of social problems, from the nuclear arms race to nuclear meltdowns, and the unresolved difficulties of bomb plant cleanup and civilian plant waste disposal and decommissioning. [3] Since 1973, reactor orders declined sharply as electricity demand fell and construction costs rose. Many orders and partially completed plants were cancelled. [4]

United States Atomic Energy Commission former agency of the United States federal government

The United States Atomic Energy Commission, commonly known as the AEC, was an agency of the United States government established after World War II by U.S. Congress to foster and control the peacetime development of atomic science and technology. President Harry S. Truman signed the McMahon/Atomic Energy Act on August 1, 1946, transferring the control of atomic energy from military to civilian hands, effective on January 1, 1947. This shift gave the members of the AEC complete control of the plants, laboratories, equipment, and personnel assembled during the war to produce the atomic bomb.

Nuclear arms race

The nuclear arms race was an arms race competition for supremacy in nuclear warfare between the United States, the Soviet Union, and their respective allies during the Cold War. During this period, in addition to the American and Soviet nuclear stockpiles, other countries developed nuclear weapons, though none engaged in warhead production on nearly the same scale as the two superpowers.

Nuclear meltdown severe nuclear reactor accident that results in core damage from overheating

A nuclear meltdown is a severe nuclear reactor accident that results in core damage from overheating. The term nuclear meltdown is not officially defined by the International Atomic Energy Agency or by the Nuclear Regulatory Commission. However, it has been defined to mean the accidental melting of the core of a nuclear reactor, and is in common usage a reference to the core's either complete or partial collapse.

By the late 1970s, nuclear power had suffered a remarkable international destabilization, as it was faced with economic difficulties and widespread public opposition, coming to a head with the Three Mile Island accident in 1979, and the Chernobyl disaster in 1986, both of which adversely affected the nuclear power industry for many decades. [5]

Anti-nuclear movement social movement

The anti-nuclear movement is a social movement that opposes various nuclear technologies. Some direct action groups, environmental movements, and professional organisations have identified themselves with the movement at the local, national, or international level. Major anti-nuclear groups include Campaign for Nuclear Disarmament, Friends of the Earth, Greenpeace, International Physicians for the Prevention of Nuclear War, Peace Action and the Nuclear Information and Resource Service. The initial objective of the movement was nuclear disarmament, though since the late 1960s opposition has included the use of nuclear power. Many anti-nuclear groups oppose both nuclear power and nuclear weapons. The formation of green parties in the 1970s and 1980s was often a direct result of anti-nuclear politics.

Three Mile Island accident nuclear accident

The Three Mile Island accident was the partial meltdown of reactor number 2 of Three Mile Island Nuclear Generating Station (TMI-2) in Dauphin County, Pennsylvania, near Harrisburg and subsequent radiation leak that occurred on March 28, 1979. It was the most significant accident in U.S. commercial nuclear power plant history. The incident was rated a five on the seven-point International Nuclear Event Scale: Accident with wider consequences.

Chernobyl disaster nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine

The Chernobyl disaster, also referred to as the Chernobyl accident, was a catastrophic nuclear accident. It occurred on 25–26 April 1986 in the No. 4 light water graphite moderated reactor at the Chernobyl Nuclear Power Plant near the now-abandoned town of Pripyat, in northern Ukrainian Soviet Socialist Republic, Soviet Union, approximately 104 km (65 mi) north of Kiev.

Early years

In 1901, Frederick Soddy and Ernest Rutherford discovered that radioactivity was part of the process by which atoms changed from one kind to another, involving the release of energy. Soddy wrote in popular magazines that radioactivity was a potentially “inexhaustible” source of energy, and offered a vision of an atomic future where it would be possible to “transform a desert continent, thaw the frozen poles, and make the whole earth one smiling Garden of Eden.” The promise of an “atomic age,” with nuclear energy as the global, utopian technology for the satisfaction of human needs, has been a recurring theme ever since. But "Soddy also saw that atomic energy could possibly be used to create terrible new weapons". [6] [7]

Frederick Soddy chemist and physicist from England

Frederick Soddy FRS was an English radiochemist who explained, with Ernest Rutherford, that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions. He also proved the existence of isotopes of certain radioactive elements.

Ernest Rutherford New Zealand-born British chemist and physicist

Ernest Rutherford, 1st Baron Rutherford of Nelson, HFRSE LLD, was a New Zealand-born British physicist who came to be known as the father of nuclear physics. Encyclopædia Britannica considers him to be the greatest experimentalist since Michael Faraday (1791–1867).

The concept of a nuclear chain reaction was hypothesized in 1933, shortly after Chadwick's discovery of the neutron. Only a few years later, in December 1938 nuclear fission was discovered by Otto Hahn and his assistant Fritz Strassmann, and proved with Hahn's radiochemical methods. The first artificial self-sustaining nuclear chain reaction (Chicago Pile-1, or CP-1) took place in December 1942 under the leadership of Enrico Fermi. [1]

James Chadwick English physicist

Sir James Chadwick, was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. In 1941, he wrote the final draft of the MAUD Report, which inspired the U.S. government to begin serious atomic bomb research efforts. He was the head of the British team that worked on the Manhattan Project during the Second World War. He was knighted in Britain in 1945 for his achievements in physics.

Discovery of the neutron

The discovery of the neutron and its properties was central to the extraordinary developments in atomic physics in the first half of the 20th century. Early in the century, Ernest Rutherford developed a crude model of the atom, based on the gold foil experiment of Hans Geiger and Ernest Marsden. In this model, atoms had their mass and positive electric charge concentrated in a very small nucleus. By 1920 chemical isotopes had been discovered, the atomic masses had been determined to be (approximately) integer multiples of the mass of the hydrogen atom, and the atomic number had been identified as the charge on the nucleus. Throughout the 1920s, the nucleus was viewed as composed of combinations of protons and electrons, the two elementary particles known at the time, but that model presented several experimental and theoretical contradictions.

Neutron nucleon (constituent of the nucleus of the atom) that has neutral electric charge (no charge); symbol n

The neutron is a subatomic particle, symbol
, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Their properties and interactions are described by nuclear physics.

In 1945, the pocketbook The Atomic Age heralded the untapped atomic power in everyday objects and depicted a future where fossil fuels would go unused. One science writer, David Dietz, wrote that instead of filling the gas tank of your car two or three times a week, you will travel for a year on a pellet of atomic energy the size of a vitamin pill. Glenn T. Seaborg, who chaired the Atomic Energy Commission, wrote "there will be nuclear powered earth-to-moon shuttles, nuclear powered artificial hearts, plutonium heated swimming pools for SCUBA divers, and much more". [8]

World War II

The phrase "Atomic Age" was coined by William L. Laurence, a New York Times journalist who became the official journalist for the Manhattan Project which developed the first nuclear weapons. [9] [10] He witnessed both the Trinity test and the bombing of Nagasaki and went on to write a series of articles extolling the virtues of the new weapon. His reporting before and after the bombings helped to spur public awareness of the potential of nuclear technology and in part motivated development of the technology in the U.S. and in the Soviet Union. [11] The Soviet Union would go on to test its first nuclear weapon in 1949.

In 1949, U.S. Atomic Energy Commission chairman, David Lilienthal stated that "atomic energy is not simply a search for new energy, but more significantly a beginning of human history in which faith in knowledge can vitalize man's whole life". [12]


This view of downtown Las Vegas shows a mushroom cloud in the background. Scenes such as this were typical during the 1950s. From 1951 to 1962 the government conducted 100 atmospheric tests at the nearby Nevada Test Site. NNSA-NSO-787.jpg
This view of downtown Las Vegas shows a mushroom cloud in the background. Scenes such as this were typical during the 1950s. From 1951 to 1962 the government conducted 100 atmospheric tests at the nearby Nevada Test Site.

The phrase gained popularity as a feeling of nuclear optimism emerged in the 1950s in which it was believed that all power generators in the future would be atomic in nature. The atomic bomb would render all conventional explosives obsolete and nuclear power plants would do the same for power sources such as coal and oil. There was a general feeling that everything would use a nuclear power source of some sort, in a positive and productive way, from irradiating food to preserve it, to the development of nuclear medicine. There would be an age of peace and plenty in which atomic energy would "provide the power needed to desalinate water for the thirsty, irrigate the deserts for the hungry, and fuel interstellar travel deep into outer space". [2] This use would render the Atomic Age as significant a step in technological progress as the first smelting of Bronze, of Iron, or the commencement of the Industrial Revolution.

This included even cars, leading Ford to display the Ford Nucleon concept car to the public in 1958. There was also the promise of golf balls which could always be found and nuclear-powered aircraft, which the US federal government even spent US $1.5 billion researching. [2] Nuclear policymaking became almost a collective technocratic fantasy, or at least was driven by fantasy: [14]

The very idea of splitting the atom had an almost magical grip on the imaginations of inventors and policymakers. As soon as someone said – in an even mildly credible way – that these things could be done, then people quickly convinced themselves ... that they would be done. [14]

In the USA, military planners "believed that demonstrating the civilian applications of the atom would also affirm the American system of private enterprise, showcase the expertise of scientists, increase personal living standards, and defend the democratic lifestyle against communism". [15]

Some media reports predicted that thanks to the giant nuclear power stations of the near future electricity would soon become much cheaper and that electricity meters would be removed, because power would be "too cheap to meter." [16]

When the Shippingport reactor went online in 1957 it produced electricity at a cost roughly ten times that of coal-fired generation. Scientists at the AEC's own Brookhaven Laboratory "wrote a 1958 report describing accident scenarios in which 3,000 people would die immediately, with another 40,000 injured". [17]

However Shippingport was an experimental reactor using highly enriched uranium (unlike most power reactors) and originally intended for a (cancelled) nuclear-powered aircraft carrier. Kenneth Nichols was a consultant for the Connecticut Yankee and Yankee Rowe nuclear power stations wrote that while considered "experimental" and not expected to be competitive with coal and oil, they "became competitive because of inflation... and the large increase in price of coal and oil." He wrote that for nuclear power stations the capital cost is the major cost factor over the life of the plant, hence "antinukes" try to increase costs and building time with changing regulations and lengthy hearings, so that "it takes almost twice as long to build a (US-designed boiling-water or pressurised water) atomic power plant in the United States as in France, Japan, Taiwan or South Korea." French pressurised-water nuclear plants produce 60% of their electric power, and have proven to be much cheaper than oil or coal. [18]

Fear of possible atomic attack from the Soviet Union caused U.S. school children to participate in "duck and cover" civil defense drills. [19]

Atomic City

During the 1950s, Las Vegas, Nevada, earned the nickname "Atomic City" for becoming a hotspot where tourists would gather to watch above-ground nuclear weapons tests taking place at Nevada Test Site. Following the detonation of Able, one of the first atomic bombs dropped at the Nevada Test Site, the Las Vegas Chamber of Commerce began advertising the tests as an entertainment spectacle to tourists.

The detonations proved popular and casinos throughout the city capitalised on the tests by advertising hotel rooms or rooftops which offered views of the testing site or by planning "Dawn Bomb Parties" [20] where people would come together to celebrate the detonations. Most parties started at midnight and musicians would perform at the venues until 4.00AM when the party would briefly stop so guests could silently watch the detonation. Some casinos capitalised on the tests further by creating so called "atomic cocktails", a mixture of vodka, cognac, sherry and champagne. [21]

Meanwhile, groups of tourists would drive out into the desert with family or friends to watch the detonations.

Despite the health risks associated with nuclear fallout, tourists and viewers were told to simply "shower". Later on, however, anyone who had worked at the testing site or lived in areas exposed to nuclear fallout fell ill and had higher chances of developing cancer or suffering pre-mature deaths. [22]


By exploiting the peaceful uses of the "friendly atom" in medical applications, earth removal and, subsequently, in nuclear power plants, the nuclear industry and government sought to allay public fears about nuclear technology and promote the acceptance of nuclear weapons. At the peak of the Atomic Age, the United States government initiated Operation Plowshare, involving "peaceful nuclear explosions". The United States Atomic Energy Commission chairman announced that the Plowshares project was intended to "highlight the peaceful applications of nuclear explosive devices and thereby create a climate of world opinion that is more favorable to weapons development and tests". [23]

Project Plowshare “was named directly from the Bible itself, specifically Micah 4:3, which states that God will beat swords into ploughshares, and spears into pruning hooks, so that no country could lift up weapons against another”. [24] Proposed uses included widening the Panama Canal, constructing a new sea-level waterway through Nicaragua nicknamed the Pan-Atomic Canal, cutting paths through mountainous areas for highways, and connecting inland river systems. Other proposals involved blasting underground caverns for water, natural gas, and petroleum storage. It was proposed to plant underground atomic bombs to extract shale oil in eastern Utah and western Colorado. Serious consideration was also given to using these explosives for various mining operations. One proposal suggested using nuclear blasts to connect underground aquifers in Arizona. Another plan involved surface blasting on the western slope of California's Sacramento Valley for a water transport project. [24] However, there were many negative impacts from Project Plowshare’s 27 nuclear explosions. [24] Consequences included blighted land, relocated communities, tritium-contaminated water, radioactivity, and fallout from debris being hurled high into the atmosphere. These were ignored and downplayed until the program was terminated in 1977, due in large part to public opposition, after $770 million had been spent on the project. [24]

In the Thunderbirds TV series, a set of vehicles was presented that were imagined to be completely nuclear, as shown in cutaways presented in their comic-books.

The term "atomic age" was initially used in a positive, futuristic sense, but by the 1960s the threats posed by nuclear weapons had begun to edge out nuclear power as the dominant motif of the atom.

1970 to 2000

A photograph taken in the abandoned city of Pripyat. The Chernobyl nuclear power plant can be seen on the horizon. View of Chernobyl taken from Pripyat.JPG
A photograph taken in the abandoned city of Pripyat. The Chernobyl nuclear power plant can be seen on the horizon.

French advocates of nuclear power developed an aesthetic vision of nuclear technology as art to bolster support for the technology. Leclerq compares the nuclear cooling tower to some of the grandest architectural monuments of western culture: [25]

The age in which we live has, for the public, been marked by the nuclear engineer and the gigantic edifices he has created. For builders and visitors alike, nuclear power plants will be considered the cathedrals of the 20th century. Their syncretism mingles the conscious and the unconscious, religious fulfilment and industrial achievement, the limitations of uses of materials and boundless artistic inspiration, utopia come true and the continued search for harmony. [25]

In 1973, the United States Atomic Energy Commission predicted that, by the turn of the 21st century, one thousand reactors would be producing electricity for homes and businesses across the USA. But after 1973, reactor orders declined sharply as electricity demand fell and construction costs rose. Many orders and partially completed plants were cancelled. [4]

Nuclear power has proved controversial since the 1970s. Highly radioactive materials may overheat and escape from the reactor building. Nuclear waste (spent nuclear fuel) needs to be regularly removed from the reactors and disposed of safely for up to a million years, so that it does not pollute the environment. Recycling of nuclear waste has been discussed, but it creates plutonium which can be used in weapons, and in any case still leaves much unwanted waste to be stored and disposed of. Large, purpose-built facilities for long-term disposal of nuclear waste have been difficult to site, and have not yet reached fruition. [26]

By the late 1970s, nuclear power suffered a remarkable international destabilization, as it was faced with economic difficulties and widespread public opposition, coming to a head with the Three Mile Island accident in 1979, and the Chernobyl disaster in 1986, both of which adversely affected the nuclear power industry for decades thereafter. A cover story in the February 11, 1985, issue of Forbes magazine commented on the overall management of the nuclear power program in the United States:

The failure of the U.S. nuclear power program ranks as the largest managerial disaster in business history, a disaster on a monumental scale … only the blind, or the biased, can now think that the money has been well spent. It is a defeat for the U.S. consumer and for the competitiveness of U.S. industry, for the utilities that undertook the program and for the private enterprise system that made it possible. [27]

So, in a period just over 30 years, the early dramatic rise of nuclear power went into equally meteoric reverse. With no other energy technology has there been a conjunction of such rapid and revolutionary international emergence, followed so quickly by equally transformative demise. [28]

21st century

The 2011 Fukushima Daiichi nuclear disaster in Japan, the worst nuclear accident in 25 years, displaced 50,000 households after radiation leaked into the air, soil and sea. Fukushima I by Digital Globe crop.jpg
The 2011 Fukushima Daiichi nuclear disaster in Japan, the worst nuclear accident in 25 years, displaced 50,000 households after radiation leaked into the air, soil and sea.

In the 21st century, the label of the "Atomic Age" connotes either a sense of nostalgia or naïveté, and is considered by many to have ended with the fall of the Soviet Union in 1991, though the term continues to be used by many historians to describe the era following the conclusion of the Second World War. Atomic energy and weapons continue to have a strong effect on world politics in the 21st century. The term is used by some science fiction fans to describe not only the era following the conclusion of the Second World War but also contemporary history up to the present day.

The nuclear power industry has improved the safety and performance of reactors, and has proposed new safer (but generally untested) reactor designs but there is no guarantee that the reactors will be designed, built and operated correctly. [30] Mistakes do occur and the designers of reactors at Fukushima in Japan did not anticipate that a tsunami generated by an earthquake would disable the backup systems that were supposed to stabilize the reactor after the earthquake. [31] According to UBS AG, the Fukushima I nuclear accidents have cast doubt on whether even an advanced economy like Japan can master nuclear safety. [32] Catastrophic scenarios involving terrorist attacks are also conceivable. [30] An interdisciplinary team from MIT has estimated that if nuclear power use tripled from 2005–2055 (from 2% [33] to 7%), at least four serious nuclear accidents would be expected in that period. [34] [35]

In September 2012, Japan announced that it would completely phase out nuclear power by 2030, although under the Abe administration this is now unlikely, with Germany, and other countries in reaction to the accident at Fukushima. [36] Germany plans to completely phase-out nuclear energy by 2022. [37]


A large anti-nuclear demonstration was held on May 6, 1979, in Washington D.C., when 125,000 people [38] including the Governor of California, attended a march and rally against nuclear power. [39] In New York City on September 23, 1979, almost 200,000 people attended a protest against nuclear power. [40] Anti-nuclear power protests preceded the shutdown of the Shoreham, Yankee Rowe, Millstone I, Rancho Seco, Maine Yankee, and about a dozen other nuclear power plants. [41]

On June 12, 1982, one million people demonstrated in New York City's Central Park against nuclear weapons and for an end to the cold war arms race. It was the largest anti-nuclear protest and the largest political demonstration in American history. [42] [43] International Day of Nuclear Disarmament protests were held on June 20, 1983 at 50 sites across the United States. [44] [45] In 1986, hundreds of people walked from Los Angeles to Washington, D.C. in the Great Peace March for Global Nuclear Disarmament. [46] There were many Nevada Desert Experience protests and peace camps at the Nevada Test Site during the 1980s and 1990s. [47] [48]

On May 1, 2005, 40,000 anti-nuclear/anti-war protesters marched past the United Nations in New York, 60 years after the atomic bombings of Hiroshima and Nagasaki. [49] [50] This was the largest anti-nuclear rally in the U.S. for several decades. [51]

Discovery and development

Nuclear arms deployment

"Atoms for Peace"

Three Mile Island and Chernobyl

Nuclear arms reduction


cover of Atomic War number one, November, 1952. AtomicWar0101.jpg
cover of Atomic War number one, November, 1952.

See also

Related Research Articles

Nuclear fission nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller parts

In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller, lighter nuclei. The fission process often produces free neutrons and gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay.

Nuclear reactor device to initiate and control a sustained nuclear chain reaction

A nuclear reactor, formerly known as an atomic pile, is a device used to initiate and control a self-sustained nuclear chain reaction. Nuclear reactors are used at nuclear power plants for electricity generation and in propulsion of ships. Heat from nuclear fission is passed to a working fluid, which in turn runs through steam turbines. These either drive a ship's propellers or turn electrical generators' shafts. Nuclear generated steam in principle can be used for industrial process heat or for district heating. Some reactors are used to produce isotopes for medical and industrial use, or for production of weapons-grade plutonium. Some are run only for research. As of early 2019, the IAEA reports there are 454 nuclear power reactors and 226 nuclear research reactors in operation around the world.

Neutron moderator medium that reduces the speed of fast neutrons, turning them into thermal neutrons that can sustain nuclear chain reactions; e.g. water, graphite, heavy water, beryllium

In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235 or a similar fissile nuclide.

Nuclear and radiation accidents and incidents event that has led to significant consequences to people, the environment or the facility

A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility." Examples include lethal effects to individuals, radioactive isotope to the environment, or reactor core melt." The prime example of a "major nuclear accident" is one in which a reactor core is damaged and significant amounts of radioactive isotopes are released, such as in the Chernobyl disaster in 1986.

Tube Alloys

Tube Alloys was a code name of the research and development programme authorised by the United Kingdom, with participation from Canada to develop nuclear weapons during the Second World War. Starting before the Manhattan Project in the United States, the British efforts were kept classified and as such had to be referred to by code even within the highest circles of government.

Nuclear fission product product of nuclear fission

Nuclear fission products are the atomic fragments left after a large atomic nucleus undergoes nuclear fission. Typically, a large nucleus like that of uranium fissions by splitting into two smaller nuclei, along with a few neutrons, the release of heat energy, and gamma rays. The two smaller nuclei are the fission products..

A criticality accident is an uncontrolled nuclear fission chain reaction. It is sometimes referred to as a critical excursion, a critical power excursion or a divergent chain reaction.

Japanese nuclear weapon program

The Japanese program to develop nuclear weapons was conducted during World War II. Like the German nuclear weapons program, it suffered from an array of problems, and was ultimately unable to progress beyond the laboratory stage before the atomic bombings of Hiroshima and Nagasaki and the Japanese surrender in August 1945.

Atoms for Peace speech

"Atoms for Peace" was the title of a speech delivered by U.S. President Dwight D. Eisenhower to the UN General Assembly in New York City on December 8, 1953.

I feel impelled to speak today in a language that in a sense is new – one which I, who have spent so much of my life in the military profession, would have preferred never to use.

That new language is the language of atomic warfare.

Nuclear safety and security Nuclear safety is defined by the International Atomic Energy Agency

Nuclear safety is defined by the International Atomic Energy Agency (IAEA) as "The achievement of proper operating conditions, prevention of accidents or mitigation of accident consequences, resulting in protection of workers, the public and the environment from undue radiation hazards". The IAEA defines nuclear security as "The prevention and detection of and response to, theft, sabotage, unauthorized access, illegal transfer or other malicious acts involving nuclear material, other radioactive substances or their associated facilities".

Plutonium Chemical element with atomic number 94

Plutonium is a radioactive chemical element with symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon, and hydrogen. When exposed to moist air, it forms oxides and hydrides that can expand the sample up to 70% in volume, which in turn flake off as a powder that is pyrophoric. It is radioactive and can accumulate in bones, which makes the handling of plutonium dangerous.

Anti-nuclear movement in the United States

The anti-nuclear movement in the United States consists of more than 80 anti-nuclear groups that oppose nuclear power, nuclear weapons, and/or uranium mining. These have included the Abalone Alliance, Clamshell Alliance, Committee for Nuclear Responsibility, Nevada Desert Experience, Nuclear Information and Resource Service, Physicians for Social Responsibility, Plowshares Movement, Women Strike for Peace, and Women's International League for Peace and Freedom. The anti-nuclear movement has delayed construction or halted commitments to build some new nuclear plants, and has pressured the Nuclear Regulatory Commission to enforce and strengthen the safety regulations for nuclear power plants.

The following outline is provided as an overview of and topical guide to nuclear technology:

Nuclear power debate

The nuclear power debate is a long-running controversy about the risks and benefits of using nuclear reactors to generate electricity for civilian purposes. The debate about nuclear power peaked during the 1970s and 1980s, as more and more reactors were built and came online, and "reached an intensity unprecedented in the history of technology controversies" in some countries. Thereafter, the nuclear industry created jobs, focused on safety and public concerns mostly waned. In the last decade, however, with growing public awareness about climate change and the critical role that carbon dioxide and methane emissions plays in causing the heating of the earth's atmosphere, there's been a resurgence in the intensity nuclear power debate once again. Nuclear power advocates and those who are most concerned about climate change point to nuclear power's reliable, emission-free, high-density energy and a generation of young physicists and engineers working to bring a new generation of nuclear technology into existence to replace fossil fuels. On the other hand, skeptics can point to two frightening nuclear accidents, the Chernobyl disaster in 1986 and subsequently the Fukushima Daiichi nuclear disaster, combined with escalating acts of global terrorism, to argue against continuing use of the technology.

This timeline of nuclear weapons development is a chronological catalog of the evolution of nuclear weapons rooting from the development of the science surrounding nuclear fission and nuclear fusion. In addition to the scientific advancements, this timeline also includes several political events relating to the development of nuclear weapons. The availability of intelligence on recent advancements in nuclear weapons of several major countries is limited because of the classification of technical knowledge of nuclear weapons development.


Project-706, also known as Project-726 was a codename of a project to develop Pakistan's first atomic bomb using uranium. At the same time, Pakistani nuclear technology scientists and engineers gained expertise in the use of reactor-grade plutonium and successfully produced weapons grade plutonium by the early 1980s.


  1. 1 2 Holl, Jack (1997). Argonne National Laboratory, 1946–96. University of Illinois Press. ISBN   0-252-02341-2.
  2. 1 2 3 Benjamin K. Sovacool (2011). Contesting the Future of Nuclear Power: A Critical Global Assessment of Atomic Energy, World Scientific, p. 259.
  3. John Byrne and Steven M. Hoffman (1996). Governing the Atom: The Politics of Risk, Transaction Publishers, p. 99.
  4. 1 2 Stephanie Cooke (2009). In Mortal Hands: A Cautionary History of the Nuclear Age , Black Inc., p. 283.
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  7. The two words atomic and nuclear are synonymous in the context of atomic power and weapons. The atom consists of a nucleus and one or more electrons. All atomic reactions involve changing one atom into another by changing the nucleus. Historically atomic power is an older term, and nuclear power is newer.President Eisenhower's "Atoms for Peace" Speech
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  82. The End:
  83. Bachelor Pad: The New Digest of Atomic Age Culture:

Further reading