X-radiation was discovered when Roentgen was working with a Crookes tube.
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Q23: The PID is used to direct the
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Q25: Early dental x-ray machines were an electrical
Q26: Dental x-ray film available today is coated
Q27: In the early 1900s dental patients would
Q29: The x-radiation output of the Crookes tube
Q30: C. Edmund Kells encouraged the practical use
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Q32: The paralleling technique is based on the
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