When I was at ISEF 2 years back with a student one of the other projects from some country around Russia (I forget which one specifically) was a 3D x-ray machine. They had used an arduino to control a stepper motor that would rotate a platform in an lead box (they had poured the lead themselves and shipped it to LA with them…) that was between a standard point and shoot digital camera and an x-ray tube from an old dental x-ray machine. I have no idea if it is legal to purchase an x-ray tube from old dental equipment (or scavenge one???) in the US, but it was pretty sweet. The student who made it was I think 16? I would think it would be a very doable project…Just saying.
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