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I niels bohr don't have a source for the purity of the plutonium, but I can easily ask the guy who told me about the 19 ft length (and who worked in nuclear targetting research and therefore knows what he is talking about). I'll come back to you when I have the answer. David Newton 09:10, 3 December 2005 (UTC) 19 ft sounds to me like the right number for what they calculated during the war based niels bohr on the Hanford plutonium, but I can check on that. --Fastfission 18:23, 3 December 2005 (UTC) I added a calculation, which would suggest that niels bohr the last few centimeters would have to be travelled in preferably much less than 40 microseconds, i.e. a speed of "much" more than ca. 1000 m/s. Considering that muzzle velocity can be up to 1,800 m/s, it may indeed just be possible.--Patrick 00:46, 4 December 2005 (UTC) I've got a preliminary answer. The exact values are classified (for good reason), although I would imagine that anyone with much of a background in nuclear physics could come up with a ballpark figure based on things like neutron cross-section fairly easily.
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