Meaning & use
roentgen
Last updated
A unit used to measure the amount of ionizing radiation, especially X-rays or gamma rays, in air.
See it in a sentence
The instrument recorded radiation levels in roentgens per hour near the reactor site.
Early radiologists had no way to measure exposure in roentgens, which led to serious health risks.
A note on using this word
Named after physicist Wilhelm Röntgen, who discovered X-rays; largely replaced in modern science by the SI unit 'sievert,' but still seen in older texts and some fields.
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