U233 does not "blow up as good as U235".  It may be theoretically possible to   
   make it blow up, but the critical mass is a lot higher and it is from my   
   understanding of the below more persnickety and dangerous to work with.  As   
   far as I know no one has    
   ever yet made a pure U233 bomb work.   
      
   https://en.m.wikipedia.org/wiki/Uranium-233   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)