Its power unit, however, was derived from the reactor of the more modern American nuclear submarine Skipjack.

Instead, the element is prepared, in milligram amounts, by the neutron irradiation of < sup > 226 </ sup > in a nuclear reactor.

A broad public discussion of environmental problems began in the mid-1980s, when the first " green " groups formed in opposition to Yerevan's intense industrial air pollution and to nuclear power generation in the wake of the 1986 reactor explosion at Chernobyl '.

For an example of its use, analysis of the concentration of elements is important in managing a nuclear reactor, so nuclear scientists will analyze neutron activation to develop discrete measurements within vast samples.

* 1986 – A nuclear reactor accident occurs at the Chernobyl Nuclear Power Plant in the Soviet Union ( now Ukraine ), creating the world's worst nuclear disaster.

In 1950 he also proposed an idea for a controlled nuclear fusion reactor, the tokamak, which is still the basis for the majority of work in the area.

The University of Missouri Research Reactor Center is the largest research reactor in the U. S. and produces radioisotopes used in nuclear medicine.

In nuclear physics, a single stray neutron can result in an prompt critical event, which may be finally be energetic enough for a nuclear reactor meltdown or ( in a bomb ) a nuclear explosion.

Demonstration of a self-sustaining nuclear chain reaction was accomplished by Enrico Fermi and others, in the successful operation of Chicago Pile-1, the first artificial nuclear reactor, in late 1942.

Enrico Fermi (; 29 September 1901 – 28 November 1954 ) was an Italian physicist, naturalized American later in his life, particularly known for his work on the development of the first nuclear reactor, Chicago Pile-1, and for his contributions to the development of quantum theory, nuclear and particle physics, and statistical mechanics.

The money was used in studies which led to the first nuclear reactor — Chicago Pile-1, a massive " atomic pile " of graphite bricks and uranium fuel which went critical on December 2, 1942.

* Three nuclear reactor installations have been named after Fermi:

In 1958 he led the design team for the TRIGA, a small, inherently safe nuclear reactor used throughout the world in hospitals and universities for the production of isotopes.

Godzilla, running low on radioactive energy after his fights with the Super X II and Biollante, heads towards the nearest operational nuclear reactor, which is located in Tsuruga, on the other side of the country.

The organization argues that the potential of nuclear power to mitigate global warming is marginal, referring to the IEA energy scenario where an increase in world's nuclear capacity from 2608 TWh in 2007 to 9857 TWh by 2050 would cut global greenhouse gas emissions less than 5 % and require 32 nuclear reactor units of 1000MW capacity built per year until 2050.

In Philadelphia, in 2006, Greenpeace issued a press release that said " In the twenty years since the Chernobyl tragedy, the world's worst nuclear accident, there have been nearly IN ALARMIST AND ARMAGEDDONIST FACTOID HERE ," The final report warned of plane crashes and reactor meltdowns.

After zirconium was chosen as material for nuclear reactor programs in the 1940s, a separation method had to be developed.

* 1939 – Albert Einstein and Leó Szilárd write a letter to Franklin D. Roosevelt, urging him to begin the Manhattan Project to develop a nuclear weapon.

* 1946 – First flight of the Convair B-36, the world's first mass-produced nuclear weapon delivery vehicle.

RAT-C was a program to develop a stand-off ASW weapon that used a nuclear depth charge.

With the failure of both the RAT-A and RAT-B programs, RAT-C was redesigned from a stand-off nuclear ASW weapon to one that could use not only a nuclear depth charge but also homing ASW torpedo.

The nuclear weapon was never used in combat.

Once " stand off " nuclear weapon designs were developed, bombers did not need to pass over the target at high altitude to make an attack ; they could fire and turn away to escape the blast.

He named it after Bikini Atoll in the Pacific, the site of the Operation Crossroads nuclear weapon tests in July that year.

It was the primary British nuclear deterrent weapon until the Royal Navy started operating Polaris missile armed nuclear submarines.

While ballistic missiles were the preferred weapons for land targets, heavy nuclear and conventional tipped cruise missiles were seen by the USSR as a primary weapon to destroy US naval carrier battle groups.

It was a single-stage, road-transportable, surface-launched, storable liquid propellant fueled missile that could deliver a megaton-class nuclear weapon.

His first action is to trigger a nuclear weapon in orbit around the Earth, in order to absorb the energy contained within for his own use.

The most controversial change was the scene where the Russian freighter officer Colonel Kashirin valiantly attempts to stop the launch of a nuclear weapon.

New World edited the scene ( and added a brief shot of Kashirin pressing the launch button ) so that now Kashirin deliberately launches the nuclear weapon.

In the late 1960s, the U. S. had plans for an underground nuclear weapon test in the tectonically unstable island of Amchitka in Alaska.

" The UN has estimated that the nuclear weapon tests in Kazakhstan caused about 100, 000 people to suffer over three generations.

Computer hardware development spurred by nuclear weapon research led to general-purpose computer " mapping " applications by the early 1960s .< ref name =" map_printing_methods ">

The nuclear isomer < sup > 178m2 </ sup > Hf was at the center of a controversy for several years regarding its potential use as a weapon.

Additionally, ICBMs are generally considered to be nuclear only ; although several conceptual designs of conventionally armed missiles have been considered, the launch of such a weapon would be such a threat that it would demand a nuclear response, eliminating any military value of such a weapon.

After first testing a domestic built nuclear weapon in 1964, it went on to develop various warheads and missiles.

* High-alert nuclear weapon

A great many writers are bewitched by the apparently overwhelming advantage an attacker would have if he were to strike with complete surprise using nuclear rockets.

In 1949, he was first to propose that a total war in the nuclear age would consist of delivering the entire nuclear arsenal in a single overwhelming blow, going as far as " killing a nation ".

In nuclear strategy, a first strike is a preemptive surprise attack employing overwhelming force.

In such a case, an overwhelming nuclear response would destroy every enemy city and thus every potential hostage which could be used to influence the attacker's behavior.

In 1949, LeMay was first to propose that a nuclear war be conducted by delivering the nuclear arsenal in a single overwhelming blow, going as far as " killing a nation ".

Fail-deadly is a concept in nuclear military strategy that encourages deterrence by guaranteeing an immediate, automatic, and overwhelming response to an attack.

This was in part to serve as a balance for electronic physics to survive the overwhelming growth of nuclear physics following the war ".

Also a typical feature in all depicted eras is the sudden switch from hunter to hunted ; while stalking enemy ships or carrying deadly nuclear missiles, the submarine often becomes, within moments, the hunted victim of overwhelming attack, the crew fleeing for its collective life.

The resulting war lasted only a few hours, but between the nuclear exchange and the years of nuclear winter that followed, the overwhelming majority of the human race was annihilated.

* Crimson Tide ( movie ) for a more modern example and particularly, when Gene Hackman threatens to shoot a fellow seaman if Viggo Mortenson doesn't unlock nuclear weapons, the overwhelming weight given to proximity vs potential harm in decision-making under stress.

It predicted a nuclear arms race, forcing the United States to develop nuclear armaments at such a pace that no other nation would think of attacking first from fear of overwhelming retaliation.