It is my understanding that small magnets won't hurt a healthy adult. A good rule is never apply magnets to your head. If you are like me, when I hold a neo magnet I can feel something sort of like nerve twitches.
As for radioactive materials on a rod, there are different treories. One is that the tip of the rod is an emitter and the radioactive material enhances this effect. Do a google search for homebrew lightning detector.
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