cathode rays

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The stream of electrons emanating from the negative pole (cathode) of a vacuum tube when an electric current is passed through it. At very high voltages, cathode rays emit high-energy x-rays, i.e., ionized radiation. At lower voltages, such as in TV screens and computer monitors, low-energy x-rays are produced but are blocked by lead in the glass screen.

Subjects: Public Health and Epidemiology — Physics.

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