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.
Nuclear fuel pellets are compounds consisting of center and outside shell where in most world's nuclear reactors, the center contains a brittle uranium blend, and the solid outside shell is made of a metallic alloy containing the element zirconium.ukushima accident and the search for safer nuclear power plants. The working principle in each nuclear plant starts with fission. The typical core of a nuclear power plant uses the heat generated by fission of uranium and plutonium in fuel rods to heat and then pressurize water.