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<p>We can classify radiation into ionizing and non-ionizing radiation, according to the effects it produces on matter.</p><p>Ionizing radiation includes cosmic rays, X rays and the radiation from radioactive materials.</p><p>Non-ionizing radiation includes ultraviolet light, radiant heat, radio waves and microwaves.In medical practice ultrasound and magnetic resonance imaging (MRI) involve non-ionizing radiation.</p>&copy; PhotoDisk
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2009.04.29

天然和人為電離輻射 （英文）

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