Credit:
 Thanks to Ms. Norvang and Ms. Taylor for responding to the bonus-pt project, "Fusion, fision, energy generation, and bombs" and finding the following nice web sites. 

Sayfonh Norvang:
http://en.wikipedia.org/wiki/Nuclear_weapon, linked in the Class web.

Staycey Taylor
http://www.bt.cdc.gov/radiation/dirtybombs.asp,  linked in the Class web.
http://faculty.ncwc.edu/toconnor/429/429lect18.htm
http://science.howstuffworks.com/nuclear-bomb12.htm