->  TW> Please refresh me with a reference as it has been some 48 years since 
->  TW> I took that course in the US Navy's Nuclear Power School.
-> They were dealing in fusion technology? ;)

 No that was Fission but the Principles of Radioactivity are the Same.
Bacicly Neutrons need to be Added to make a NON radioactive substance
Radioactive.
Now a Strong Gamma field dosen't do the Human Body much good but then
you just use TDS(Time/Distance/Shielding) to reduce that hazard.
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