This is a cool concept, however, it still suffers from a major problem: terrorists can accumulate a large collection of them, and then build dirty bombs. Dirty bombs really suck, since they don’t rely on a chain reaction, but conventional explosives to turn their radioactive payload into a aerosol.
No way our government would ever allow such technology anywhere, and the environmentalists would have hissy fits!
This is why the NRC,DOD and various governmental bodies regulating radioisotopes will keep close tabs. The patent is already filed and looks like getting ready for production.
Universities and Colleges around this nation have radioisotopes on their campuses.
I personally know of 5 campuses in the LA area that have radioactive material on campus for research purposes.