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Politics : Politics for Pros- moderated
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To: Sea Otter who wrote (226945)11/5/2007 12:10:11 AM
From: Nadine Carroll  Read Replies (1) of 793877
 
According to this, there are some designs that use a reflector that need as little as 16 kilos of U-235:

(a) Uranium-235 needed to make a bomb:

- 15 kilograms: Weight of a solid sphere of 100 percent uranium-235 just large enough to achieve a critical mass with a beryllium reflector. Diameter of such a sphere: 4.48 in (11.4 cm). Diameter of a regulation softball: 3.82 in (9.7 cm).
- 16 kilograms: Amount needed for an Iraqi bomb design found by UN inspectors.
- 50 kilograms: Weight of a solid sphere of 100 percent uranium-235 just large enough to achieve a critical mass without a reflector. Diameter of such a sphere: 6.74 in (17.2 cm), comparable to an average honeydew melon.
- 60 kilograms: Reported amount used in Hiroshima bomb "Little Boy."

http://www.wisconsinproject.org/pubs/articles/2001/bomb%20facts.htm
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