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- From: mvp@netcom.com (Mike Van Pelt)
- Subject: Re: Pu production (was: Greennazis
- Message-ID: <1992Nov23.224820.3236@netcom.com>
- Keywords: Plutonium! Satan! Evil! Danger! Run Away! Run Away!
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <FqG=1W-@engin.umich.edu> <1992Nov20.175049.1100@gn.ecn.purdue.edu> <28530@castle.ed.ac.uk>
- Date: Mon, 23 Nov 1992 22:48:20 GMT
- Lines: 25
-
- In article <28530@castle.ed.ac.uk> gtclark@festival.ed.ac.uk (G T Clark) writes:
- > Any Pu produced would be mixed in with the rest of the spent
- >fuel. By "not bomb-grade" do you just mean this(i.e. separation would be
- >needed) or is there a further difference?
-
- Plutonium from reprocessed fuel rods contains a lot (something
- like 10-20%) of Pu240 in addition to the Pu239. Pu239 is what
- you want for bombs. Pu240 is very bad. It has a high
- spontaneous fission rate, which gives you a high neutron
- background, which makes it somewhere between impossible and
- very, very difficult to compress the plutonium to supercritical
- and keep it there for long enough to get more than a "fizzle".
-
- You can separate Pu240 and Pu239, but it is considerably more
- difficult than separating U238 and U235 because the mass
- difference is only 1/3 as great. Nobody does this; people who
- want to make plutonium fission bombs, without any exceptions I
- know of, build a special reactor for plutonium production which
- runs on a short enough cycle to avoid producing much Pu240.
-
- --
- Mike Van Pelt | What happens if a big asteroid hits Earth?
- mvp@netcom.com | Judging from realistic simulations involving a
- | sledge hammer and a common laboratory frog, we
- | can assume it will be pretty bad. -- Dave Barry
-