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Why can't we see nuclear radiation with naked eyes?

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You actually can't see the decay of radium directly. Radium decay emits alpha and beta radiation. Alpha radiation is stopped by the skin; beta radiation is slightly more penetrating and might occasionally cause a flash in the eye. read more

Human eyes are sensitive to a limited range of radiation wavelength, which is called the visible spectrum, and the wavelength(es) of nuclear radiation is much shorter than that of visible spectrum(meaning a higher frequency and carrying more energy and can be more harmful to human body). read more

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