roentgen

Meanings

1. 1
   noun

   a non-SI unit of exposure to X-rays or gamma rays, equal to 0.000258 coulomb per kilogram of dry air

   The instrument recorded an exposure of several roentgens near the source.

Named for German physicist Wilhelm Conrad Röntgen, who discovered X-rays in 1895. The unit name was adopted internationally in the early twentieth century.

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