Verbal agreements are only as good as the paper they are written on. If your friend hasn't paid you for almost a year I wouldn't hold my breath waiting. Just be glad it only cost yo $500 to find out how good a friend they were. It could have cost you thousands of dollars.
Nuclear Materials. Nuclear materials are the key ingredients in nuclear weapons. They include fissile, fussionable and source materials. Fissile materials are those which are composed of atoms that can be split by neutrons in a self-sustaining chain-reaction to release energy, and include plutonium-239 and uranium-235.
Types of Nuclear Fuel. The different nuclear processes will use different types of fuel. In general terms: 1  Fission reactions will use fissile heavy elements.2  Fusion will use fusible light elements.he most often used fuels are Uranium-235 and Plutonium-239; they become instable when bombarded by slow (also known as âthermalâ) neutrons. They are not easy to find or produce materials, and the process to generate them is usually the most expensive part in the creation of a nuclear bomb.