Warhead is a American film directed by John O'Connor and produced by Buddy Ruskin who produced The Mod Squad. The film was originally shot in.
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North Korea has produced fissile material for nuclear warheads and detonated five nuclear devices," the FAS February 17 update said. Improved warhead designs allow smaller warheads for a given yield, while better electronics and guidance systems allowed greater accuracy. The GMLRS Alternative Warhead was designed to engage the same target set and achieve the same area-effects requirement as the old MLRS submunition warheads , but without the lingering danger of unexploded ordnance. The KCNA said the launches "once again examined the operational features of the detonating devices of nuclear warheads mounted on the ballistic rockets".
Warhead | Define Warhead at leondumoulin.nl
Ballistic tests by N. We believe they have accomplished miniaturisation of a nuclear warhead to mount it on a Rodong missile," the South Korean official, with knowledge of South Korea's assessment of the North's nuclear programme, told a small group of reporters on condition of anonymity. North Korea can put nuclear warhead on mid-range missile: Declaring that a nuclear warhead explosion test and a test-fire of several kinds of ballistic rockets able to carry nuclear warheads will be conducted in a short time to further enhance the reliance of nuclear attack capability, he Kim instructed the relevant section to make prearrangement for them to the last detail," the agency said.
North Korean leader says will soon test nuclear warhead Video.
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We are confident that the new GMLRS Alternative Warhead will also provide reliable, highly accurate capability for our domestic and international customers. The United States, Russia, Britain and France could help greatly by transitioning from their multiple warhead weapons.
North Korea has long boasted of making strides in acquiring a "nuclear deterrent", but there had been general skepticism that it could master the step of miniaturizing a nuclear warhead to mount on a ballistic missile. North Korea may be close to developing nuclear missile - Reuters. Both primary and secondary are contained within an outer metal case. Radiation from the fission explosion of the primary is contained and used to transfer energy to compress and ignite the secondary.
Some of the initial radiation from the primary explosion is absorbed by the inner surface of the case, which is made of a high-density material such as uranium. Radiation absorption heats the inner surface of the case, turning it into an opaque boundary of hot electrons and ions.
Subsequent radiation from the primary is largely confined between this boundary and the outer surface of the secondary capsule. Initial, reflected, and re-irradiated radiation trapped within this cavity is absorbed by lower-density material within the cavity, converting it into a hot plasma of electrons and ion particles that continue to absorb energy from the confined radiation.
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With the fission primary generating an explosive yield in the kiloton range, compression of the secondary is much greater than can be achieved using chemical high explosives. Compression of the spark plug results in a fission explosion that creates temperatures comparable to those of the Sun and a copious supply of neutrons for fusion of the surrounding, and now compressed, thermonuclear materials. Thus, the fission and fusion processes that take place in the secondary are generally much more efficient than those that take place in the primary.
In an efficient, modern two-stage device—such as a long-range ballistic missile warhead—the primary is boosted in order to conserve on volume and weight. Boosted primaries in modern thermonuclear weapons contain about 3 to 4 kg 6. The secondary typically contains a composite of fusion and fissile materials carefully tailored to maximize the yield-to-weight or yield-to-volume ratio of the warhead, although it is possible to construct secondaries from purely fissile or fusion materials.
Historically, some very high-yield thermonuclear weapons had a third, or tertiary, stage.
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In theory, the radiation from the tertiary can be contained and used to transfer energy to compress and ignite a fourth stage, and so on. There is no theoretical limit to the number of stages that might be used and, consequently, no theoretical limit to the size and yield of a thermonuclear weapon. However, there is a practical limit because of size and weight limitations imposed by the requirement that the weapon be deliverable. Uranium and thorium and some other fissionable materials cannot maintain a self-sustaining fission explosion, but these isotopes can be made to fission by an externally maintained supply of fast neutrons from fission or fusion reactions.
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Thus, the yield of a nuclear weapon can be increased by surrounding the device with uranium, in the form of either natural or depleted uranium , or with thorium, in the form of natural thorium. This approach is particularly advantageous in a thermonuclear weapon in which uranium or thorium in the outer shell of the secondary capsule is used to absorb an abundance of fast neutrons from fusion reactions produced within the secondary.
The explosive yields of some weapon designs have been further increased by the substitution of highly enriched uranium for uranium in the secondary. However, to obtain tailored weapon effects or to meet certain weight or space constraints, different ratios of fission yield to fusion yield may be employed, ranging from nearly pure fission weapons to a weapon where a very high proportion of the yield is from fusion. Another tailored weapon is the enhanced radiation warhead, or neutron bomb , a low-yield on the order of one kiloton , two-stage thermonuclear device designed to intensify the production of lethal fast neutrons in order to maximize mortality rates while producing less damage to buildings.
The enhanced radiation is in the form of fast neutrons produced by the fusion of deuterium and tritium. The secondary contains little or no fissionable material, since this would increase the blast effect without significantly increasing the intensity of fast neutrons.
The United States produced enhanced-radiation warheads for antiballistic missiles, short-range ballistic missiles, and artillery shells. We welcome suggested improvements to any of our articles. You can make it easier for us to review and, hopefully, publish your contribution by keeping a few points in mind. Your contribution may be further edited by our staff, and its publication is subject to our final approval.
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Learn More in these related Britannica articles: Nuclear fusion , process by which nuclear reactions between light elements form heavier elements up to iron.