As of Version 9.0, unit functionality is built into the Wolfram Language

is a unit of exposure to X or gamma radiation.


  • To use Roentgen, you first need to load the Units Package using Needs["Units`"].
  • Roentgen is equivalent to approximately 0.000258 Coulomb/Kilogram (SI units).
  • Roentgen is equivalent to Rontgen.
  • Convert[n Roentgen,newunits] converts n Roentgen to a form involving units newunits.
  • Roentgen is typically abbreviated as R.