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--Fastfission 01:55, 3 December 2005 (UTC) [edit] Gun type It is theoretically possible to build a plutonium gun-type device, optimization but it would need to be 19 feet long in order to allow the sub-critical masses to be fused into a critical mass before a fizzle occurs. It is not clear whether this applies for the purest plutonium (probably), or the kind that was available.--Patrick 01:19, 3 December optimization 2005 (UTC) Hmm, I don't know, but the added length would, I optimization imagine, serve to allow the pieces to pick up speed. If they were fast enough, I assume they would be able to combine reasonably well before the reaction completed. --Fastfission 02:00, 3 December 2005 (UTC) Considering that the spontaneous fission rate depends very much on the purity of the plutonium, giving a precise figure like 19 feet without mentioning the purity is odd. The sentence by itself would suggest that what is meant is "for the purest possible plutonium", but in context it is suggested that it applies for the impure kind that was available.
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