Roentgen

The roentgen (or röntgen) was previously used as a unit to measure radiation exposure. It was defined as the quantity of x-rays that produces 2.580 × 10-4 coulombs of charge collected per unit mass (kilograms) of air at standard temperature and pressure (STP): 1 R = 0.000258 C/kg air.

History and etymology

Named after Wilhelm Conrad Roentgen who first detected x-rays in 1895. 

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Article information

rID: 18983
Section: Physics
Tags: stub, refs
Synonyms or Alternate Spellings:
  • Röntgen
  • Röntgens
  • Roentgens

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