Wilhelm Röntgen discovered X-rays by accident
On this day · 8 November 1895
A stray glow across his darkened lab in 1895 led Röntgen to a new kind of invisible light—and the world's first medical imaging.
On the evening of 8 November 1895, German physicist Wilhelm Conrad Röntgen was working with a discharge tube wrapped in thick black cardboard in his darkened Würzburg laboratory. He noticed a chemically coated screen across the room glowing faintly—light that should not have been there.
The rays passed through paper, wood, and flesh but were stopped by denser matter. Unsure of their nature, Röntgen named them “X-rays.” Weeks later he made the famous image of his wife’s hand, her bones and wedding ring sharply outlined.
November 8 is now marked worldwide as World Radiography Day.
The discovery spread across the globe within months and transformed medicine almost overnight. In 1901 Röntgen received the very first Nobel Prize in Physics. Characteristically, he refused to patent his finding, insisting the new rays belonged to all of humanity.
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