The DIY X-Ray Machine. Oldie but goodie. But remember, kids, be safe out there!
Whenever the machine is in operation, the experimenter must wear a lead apron and stand well behind the orifice through which the rays are emitted. Never turn your back to the machine so that you are between it and the apron!…Finally, resist the temptation to make X-ray examinations of the bones in your hands or other body parts. A frozen fish makes a much safer test object.