On Mon, Apr 04, 2011 at 01:04:11PM +0200, Jörn Nettingsmeier wrote:
>> So, just having enough Pu-239 in one location is definitely,
Yes. Keeping the thing together for long enough is the key
to a full nuclear explosion. And it's hard and not going to
happen by accident: the energy generated when a reaction start
to sustain itself destroys the conditions for it to continue.
Criticality != explosion. All reactors are critical when they
produce power. There is even evidence that controlled sustained
fission reactions have occured in nature. That's not possible
any more as the natural uranium on our planet has decayed too
much to become critical in any quantity.
> when you pile up too much plutonium or uranium, criticality accidents
Most bombs are actually very dirty and only use part of the fissionable
material they contain - it's easier to make them that way.
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