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Calcul energie fission uranium 2358/1/2023 ![]() ![]() ![]() A pretty big ball, thoughĪ 169mm sphere of uranium will go critical all by itself. By introducing a void in the middle of the sphere, the mass is sub-critical. At first glance, that won't work either because an Earth sized ball of U235 is in fact critical at STP. The normal method with plutonium is to build a sphere which is sub-critical at STP, but becomes critical when compressed by an outer sphere of high explosives detonated perfectly. Because each half would still be critical. U235 is generally associated with a "gun-type" device (Thin Man/Little Boy), taking two subcritical masses and slamming them together as fast as possible.Ĭutting it in half won't work in an Earth-sized chunk of U235. But the Cold war is over, and duck-and-cover has faded into nostalgia, making atom bomb tech quaint - fair game for The History Channel or Nova, alongside steam engines and the Glomar Explorer caper. Honestly, it's sorta spooky that a random citizen would know any of this. This is the essence of bomb-making.īut yet, also, having the mass be sub-critical up until the moment you hit the red button. a useful bomb, then it's all about holding the critical mass together longer than it would stay naturally. So if you want anything funner than Chernobyl to happen, i.e. ![]() So the normal state-of-affairs is for the critical mass to create just enough energy to blow itself into sub-critical pieces. All the following trouble came from plain fire (graphite likes to burn), possibly being rekindled by decay heat.
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