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I noticed some online videos where people have built these things in their house or garage.

Is it dangerous to do so?

The high voltage appears to be a potential hazard, but what about radiation -- what radiation do fusors emit and how dangerous is it?

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    $\begingroup$ Do you mean a fusor that actually achieves nuclear fusion, or one that only produces plasma? $\endgroup$ – probably_someone Sep 26 '18 at 14:49
  • $\begingroup$ @probably_someone I would be interested in the answer for each case. $\endgroup$ – mherzl Sep 26 '18 at 15:05
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    $\begingroup$ High voltage arcs produce x-rays. Actual fusion will likely produce neutrons and gammas. I'll skip high-energy ions unless you want to bathe in the plasma. How much of each is left as an exercise to your local radiation tech. $\endgroup$ – Jon Custer Sep 26 '18 at 15:26
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    $\begingroup$ A significant number of do-it-yourself fusors can use aneutronic reactions if you can get the precursors. But there is still prompt gamma as well as bremstrahullung. $\endgroup$ – dmckee Sep 27 '18 at 14:15

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