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It medical news would seem that the lower density delta phase has offsetting disadvantages in a medical news bomb, where high density translates into improved efficiency and reduced material requirements, but this turns out not to be so. Delta stabilized plutonium undergoes a phase transition to the alpha state at relatively low pressures (tens of kilobars, i.e. tens of thousands of atmospheres). The multi-megabar pressures generated by the implosive shock wave cause this transition to occur, in addition to the normal effects of shock compression. Thus a greater density increase and larger reactivity medical news insertion occurs with delta phase plutonium than would have been the case with the denser alpha phase. The pit was formed in two hemispheres, probably by first casting a blank, followed by hot pressing in a nickel carbonyl atmosphere. Since plutonium is a chemically very reactive metal, as well as a significant health hazard, each half-sphere was electroplated with nickel (or silver, as has been reported for the Gadget core).
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