The film above this text introduces the case where the extra energy that the friction of the screwdriver caused a chain reaction in plutonium ball and radioactive accident at Los Alamos laboratory in 1945. That case was one of the most terrifying visions of what the extra energy can cause in the plutonium. There is suspicion that the "Demon Core". Is used to make the radiological weapon that can send radioactive bursts many times.
That it is possible made the radiological weapon that bases the friction. When the rotating speed of the plutonium ball increases there is something that causes friction that plutonium sends a burst of radioactive radiation. The researchers can make the same effect by hitting the plutonium ball with a hammer. When an enemy approaches that system increases the radiation in the area. So warming of the fission stage is enough to detonate nuclear weapons.
In the modern versions, there is the possibility that the fission bomb can detonate also by using laser rays. The laser system would increase the temperature of the fission material. And the thing will decrease the critical mass.
These types of weapons are called sub-critical systems. The fission will be assisted by using electromagnetic radiation which increases the temperature and energy load in the fission material. In some early versions, the fission stage would warm up by using acetylene flame.
Image ) High-yield thermonuclear detonation "Castle Romeo" (11Mt.) March 26, 1954 (Wikipedia, Castle Romeo)
Sub-critical nuclear weapons are small-size fission systems. Those weapons can use independently.
But they can also detonate small neutron bombs. Neutron bombs are small fusion or hydrogen bombs. Those systems can use to create neutrons for modern FFF (Fission-Fusion-Fission) weapons. Hydrogen bombs need the fission stage for detonation. The problem with plutonium is that metal is extremely expensive. And one version of the system that can release needed neutrons that detonate the fusion stage is the neutron bomb.
And they are sending powerful neutron bursts while they are detonating. Those neutrons can conduct to the natural uranium stick. In the hydrogen bombs, the purpose of that stick is to turn to plutonium and detonate the fusion stage.
They don't require so much uranium. And they can use as the trigger for hydrogen bombs. The fusion stage itself detonates when the neutrons hit the natural uranium stick. When fast neutrons impact the U-238 isotope they turn that thing to Pu-239. And that stick detonates the fusion stage.
Thermonuclear weapon "Alarm clock"("Hydrogen" or "fusion bomb") or Teller-Ulam-construction"
Image 2) https://en.wikipedia.org/wiki/Thermonuclear_weapon
Why "Castle Bravo" was too powerful?
Why 15 megaton "Castle Bravo" was 1,5 times more powerful than its calculated power was? The reason for that was the weapon that detonated in Eniwetok Atoll on March 1, 1954, was warm. Creators of that sold-stage thermonuclear weapon made the calculations for the cryogenic state. And the extra energy stored in the warm lithium-fusion stage caused the Castel Bravo to be more powerful than it should be. And that thing caused radioactive fallout and other damages across the Eniwetok and its neighbor atoll.
The implosion system that detonates the nuclear bomb is a hammer that increases energy in plutonium bites. Normally the detonation is made by detonating the conventional explosives around the plutonium bite. The increasing energy level detonates the nuclear weapon. The fission bomb is acting as the spark plug in the hydrogen bombs.
A hydrogen or fusion bomb is a system where is a stick made of natural uranium in the middle of the chamber where is lithium. When the plutonium bomb detonates. That detonation sends neutrons to the U-238 stick. And that neutron burst detonates the fusion stage.
https://en.wikipedia.org/wiki/Castle_Bravo
https://en.wikipedia.org/wiki/Operation_Castle
https://en.wikipedia.org/wiki/Thermonuclear_weapon
Image 1) https://en.wikipedia.org/wiki/Castle_Romeo
Image 2) https://en.wikipedia.org/wiki/Thermonuclear_weapon
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