Diagram for reference here

Today we will look today at what you need
in order to make a nuclear fission bomb.

First you need some money, as it would really help
if you were the prince, sultan or other royalty of
 a small, but rich state. If not, you need to know
 on a first name basis some evil leader with lots of cash,
 oil, diamonds and so on, of a small but ambitious country,
 with a need for revenge on the world.



Step 1 - What is a nuclear fission bomb?

Fission bombs derive their power from nuclear fission,
 where heavy nuclei (uranium or plutonium) are bombarded
 by neutrons and split into lighter elements,
 more neutrons and energy.

 These newly liberated neutrons then bombard other nuclei,
 which then split and bombard other nuclei, and so on,
creating a nuclear chain reaction which releases large
amounts of energy.

 These are historically called atomic bombs,
 atom bombs, or A-bombs, though this name is not precise
due to the fact that chemical reactions release energy
from atomic bonds (excluding bonds between nuclei)
and fusion is no less atomic than fission.

Despite this possible confusion, the term atom bomb
has still been generally accepted to refer specifically
to nuclear weapons and most commonly to pure fission
devices.



Step 2 - What do you need?

a. The fissionable material

Plutonium239 isotope. Around 25 pounds (10 kg)
would be enough. If you could find some Uranium235,
 that would be good, but not great.

You would need to refine it using a gas centrifuge.
The uranium hexafluoride gas is piped in a cylinder,
 which is then spun at high speed.

The rotation causes a centrifugal force that leaves
the heavier U-238 isotopes at the outside of the cylinder,
 while the lighter U-235 isotopes are left at the center.

 The process is repeated many times over through a
cascade of centrifuges to create uranium of the
desired level of enrichment.

 To be used as the fissile core of a nuclear weapon,
the uranium has to be enriched to more than 90 per cent
 and be produced in large quantities.


You could try buying it from a former Soviet Republic,
 or from Iran, since they're trying so hard to produce it.

 North Korea is not ready yet, and unfortunately,
Iraqi dealers retired from the business.



b. The explosive to start the nuclear chain reaction

100 pounds (44 kg) of trinitrotoluene (TNT).
 Gelignite (an explosive material consisting of
collodion-cotton (a type of nitrocellulose or gun cotton)
 dissolved in nitroglycerine and mixed with wood pulp
 and sodium or potassium nitrate) would be better.
Semtex would be good too, but it's a bit hard
to get, these days.



c. The detonator

To fabricate a detonator for the device,
get a radio controlled (RC) servo mechanism,
 as found in RC model airplanes and cars.
 With a modicum of effort, a remote plunger
 can be made that will strike a detonator cap
to effect a small explosion.

 These detonation caps can be found in the electrical
 supply section of your local supermarket.

 If you're an electronics wiz, you should be
able to make it using a cellphone.



d. The pusher

The explosion shock wave might be of such short duration
 that only a fraction of the pit is compressed at any
instant as it passes through it.

A pusher shell made out of low density metal such as
 aluminium, beryllium, or an alloy of the two metals
(aluminium being easier and safer to shape but beryllium
 reflecting neutrons back into the core) may be needed
and is located between the explosive lens and the tamper.

 It works by reflecting some of the shock wave backwards
 which has the effect of lengthening it.

The tamper or reflector might be designed to work as
the pusher too, although a low density material is best
 for the pusher but a high density one for the tamper.

 To maximize efficiency of energy transfer, the density
difference between layers should be minimized.



Step 3 - How to build the nuke?

You will need to get the fissile material to the critical
 mass in order to start the chain reaction, which depends
 upon the size, shape and purity of the material as well
 as what surrounds the material.
Your weapons-grade uranium will have to be
in subcritical configuration.

First, you must arrange the uranium into two hemispherical
 shapes, separated by about 4 cm.

 Since it's highly radioactive, the best way do it
 is to ask the friend owning the small country to let
 you use one his facilities.

You could use a nuclear plant, a steel factory
or even a well equipped pharmaceutical installation
as a disguise for your plans.


It is not sufficient to pack explosive into a spherical
shell around the tamper and detonate it simultaneously
 at several places because the tamper and plutonium pit
 will simply squeeze out between the gaps in the detonation
 front.

Instead, the shock wave must be carefully shaped into a
perfect sphere centered on the pit and traveling inwards.

 This is achieved by using a spherical shell of closely
 fitting and accurately shaped bodies of explosives of
 different propagation speeds to form explosive lenses.


After a few careful calculations, all you need now is to
 carefully pack and transport your nuclear bomb to the
targeted location.

 If you happen to be an Al-Qaeda fan, you should try to
infiltrate a military facility, for the psychological effect.
 Watch it, though, they are usually well guarded!



Step 4 - Disguising the bomb and placing it for detonation

The smallest nuclear warhead deployed by the United States
was the W54, which was used in the Davy Crockett recoilless
rifle; warheads in this weapon weighed about 23 kg and had
 yields of 0.01 to 0.25 kilotons.

 This is small in comparison to thermonuclear weapons,
 but remains a very large explosion with lethal acute
radiation effects and potential for substantial fallout.

 It is generally believed that the W54 may be nearly the
 smallest possible nuclear weapon, though this may be only
smallest by weight or volume, not simply smallest diameter.


The best way to disguise it would be in the form of
an ordinary appliance, like a copier, a widescreen TV set,
 or any other inconspicuous electronic device.


Now, all you have to do is transport it to the selected
location and get to a safe distance of a few tens of miles,
 but not far enough to get out of the range of the remote
detonator. That is why a cellphone is strongly recommended
 for its wide range capabilities.

Thats about all there is to it,
Well gotta go, I hear some one knocking at my door.