nuclesar.docx

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Time Travel Research Center 2005 Cetin BAL - GSM:+90 05366063183 -

Turkey/Denizli

Nuclear Fission

The atomic bomb (also known as the atom bomb, A-bomb , or nuclear bomb)

has a destructive power created by the fission of either uranium or plutonium.

But, not any isotope of uranium can be used. Only U235 is used in the production

of an atom bomb. U235 is very hard to come by due to the fact that it is only

present within 0.7% of all natural uranium. In order to separate the U235 isotope

from natural uranium a process of enrichment is used. The uranium must be

enriched to 90% for actual use in a bomb.

The Enrichment Process

The enrichment process is complicated due to the fact that the uranium isotopes

are practically chemically identical. This means that the different isotopes

cannot be separated with just an easy chemical reaction. The isotopes must be

separated by exploiting the little mass difference between the isotopes. There

are many different methods used to separate these isotopes a couple of these are


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the commercial-gaseous diffusion process and the centrifuge process. Another

method of separation is the Electro Magnetic Separation process.

This enrichment method was created by E.O. Lawrence. It involves passing

uranium ions through a magnetic field which causes the U235 ions to separateand take a different path than the U238 ions. Following this collectors are used at

the other end of the semi-circle to capture the separated U235.

Fission of U235

Fission is when a nucleus splits into many small fragments called fission

products. These fission products become nearly half the mass of the original

nucleus and the nuclues generally emits two to three neutrons.

U235 and Plutonium each have the inherent ability to fission making them

perfect candidates for the atomic bomb. Plutonium 239 has a very high

spontaneous fission rate making it easy to for the bomb to accidently fizzle

before production is complete. While Uranium 235 has a lower rate of

spontaneous fission making it easier to deal with when building an atom bomb.

Bomb DesignThere were two types of atom bombs created one was called the "Little Boy"

and the other was titled the "Fat Man."

The Little BoyThe "little boy" atom bomb was designed to be a gun type bomb. They call it a


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gun type bomb due to the fact that the bomb shoots a mass of uranium 235 into

another mass of uranium 235 to create a supercritical mass.

wwOnce the supercritical mass is formed the initiator emits a burst of neutrons

creating the fission chain reactions. These chain reactions continue until the

energy released becomes so big that the bomb blows itself up.

The Fat Man:

The Fat Man atom bomb was created due to the fact that plutonium 239 has such

a fast spontaneous fission rate. A new design was needed to facilitate such an

isotope. The Little Boy is too slow to work with such an isotope. So, Seth

eddermeyer created an idea to use explosive charges to compress a small


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sphere of plutonium quickly to a required density that will make the plutonium

go critical and produce a nuclear explosion. Thus, the Fat Man atom bomb was

born.

Building the BombFission: The Atomic Bomb

The atomic bombs that were used onHiroshima and Nagasakiderived their explosive

power via afission chain reaction. The fuel used for Little Boy, the bomb used on

Hiroshima, was enricheduranium. Fat Man, used on Nagasaki, was fueled byplutonium.

Below is a sketch of the kind of uranium bomb used on Hiroshima. The explosive drives

the uranium "bullet" into the secondary mass of uranium to create a SuperCritical mass.

Fusion: The Nuclear Bomb

"In thermonuclear weapons, radiation from a fission explosive can be contained and used to transfer

energy to compress and ignite a physically separate component containing thermonuclear fuel."

The 3 basic concepts of thermonuclear devices, U.S. DOE, Sept 1980, Duane Sewell, Assistant

Secretary of Energy for Defense, Official Declassification Act.

Fusion Fuel

The forms of Hydrogen used in a fusion reaction -- H2 (deuterium) and H3 (tritium) -- are

gases at room temperature, so their storage in a weapon would be difficult. Instead, a

substance called lithium deuteride (Li6D or Li7D) is used.
http://wso.williams.edu/~globe/War1.htmhttp://wso.williams.edu/~globe/War1.htmhttp://wso.williams.edu/~globe/War1.htmhttp://wso.williams.edu/~globe/Fission.htmhttp://wso.williams.edu/~globe/Fission.htmhttp://wso.williams.edu/~globe/Fission.htmhttp://wso.williams.edu/~globe/Reaction.htm#Uraniumhttp://wso.williams.edu/~globe/Reaction.htm#Uraniumhttp://wso.williams.edu/~globe/Reaction.htm#Uraniumhttp://wso.williams.edu/~globe/Fission.htm#Plutoniumhttp://wso.williams.edu/~globe/Fission.htm#Plutoniumhttp://wso.williams.edu/~globe/Fission.htm#Plutoniumhttp://wso.williams.edu/~globe/Fission.htm#Plutoniumhttp://wso.williams.edu/~globe/Reaction.htm#Uraniumhttp://wso.williams.edu/~globe/Fission.htmhttp://wso.williams.edu/~globe/War1.htm


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Lithium

The lightest of metals,lithiumis only half as dense as water. Lithium is found combined

with other elements in igneous rocks and mineral spring water. Lithium has severalisotopes, ranging from Li5 to Li9. Li6 and Li7 are used in weapons, and are naturally

occuring. Li5, Li8, and Li9 are man-made radioisotopes.

Li6 is present as 7.5% of all naturally occuring Li. Separation methods include

electrolysis, distillation, chemical exchange, or EM methods. Li bonds with H to form the

solid Li6D. This material is a whitish, slightly-blue powdery light salt-solid (which isextremely hygroscopic) at room temperature. It is made by heating metal lithium in a

vessel, into which deuterium gas is injected. It is then pressed and shaped into a ceramic.

Li6D in the Fusion Reaction

When a neutron is absorbed by a molecule of litium deuteride (Li6D), the molecule breaks

up into a He, H2 (deuterium) and H3 (tritium). The deuterium can then react with thetritium in fusion. This releases enormous amounts of energy, much greater than you would

get in a fission reaction. The end products include a free neutron and a helium atom.

Schematically:

Li6 + n -> He4 + T + 4.7 MeV

then

D + T -> He4 + n + 17.6 MeV.

n + U-238 -> neutrons + fission products + energy

These reactions occur in under 1/10-6 secs.

Li6D in the Bomb

In order to begin a fusion reaction in a thermonuclear weapon, the lithium deuteride solidmust be compressed to 15-30 times its original uncompressed density at RTP

(15lbs/foot^3).

Compression is achieved by a smaller fission reaction, which forces the Li6D fuel

together.

[image: showing fission reaction forcing fusion fuel together]

Compression is needed to:

(1) increase fusion probability(2) increase fusion rate
http://mwanal.lanl.gov/julie/imagemap/periodic/3.htmlhttp://mwanal.lanl.gov/julie/imagemap/periodic/3.htmlhttp://mwanal.lanl.gov/julie/imagemap/periodic/3.htmlhttp://mwanal.lanl.gov/julie/imagemap/periodic/3.html


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By packing the molecules closer together, you increase the probabilityof fusionoccuring. Compressing the molecules paves the way to overcoming theelectrostatic repulsion of the H atoms in the Li6D.

A fasterrateof fusion produces a larger chain reaction. The reaction rate isproportional to the square of the fuel density -- in other words, the more

compressed the fuel is, the shorter the reaction time will be. Increase the density by

a factor of 30, for example, and the rate of fusion increases by a factor of 900.

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