Source: wikibot/rontgen-equivalent-physical
= Röntgen equivalent physical
{wiki=Röntgen_equivalent_physical}
The Röntgen (symbol: R) is a unit of measurement used in radiation physics to quantify exposure to ionizing radiation. Specifically, it measures the amount of X or gamma radiation that produces a particular amount of ionization in air. The Röntgen is defined as the amount of radiation that produces 2.58 × 10^-4 coulombs of charge per kilogram of air.