Radiation-Exposure Converter

Free online radiation-exposure converter – convert 7+  scales of radiation exposure. Bridge the gap between SI units and legacy Roentgens. Explore many other unit converters or learn more about radiation-exposure unit conversions.

Exposure Converter

0 Roentgen

All list of radiation-exposure units for conversion

  • millicoulomb/kilogram to coulomb/kilogram,   
  • coulomb/kilogram to millicoulomb/kilogram
  • microcoulomb/kilogram to coulomb/kilogram,   
  • coulomb/kilogram to microcoulomb/kilogram
  • roentgen to coulomb/kilogram,   
  • coulomb/kilogram to roentgen
  • tissue roentgen to coulomb/kilogram,   
  • coulomb/kilogram to tissue roentgen
  • parker to coulomb/kilogram,   
  • coulomb/kilogram to parker
  • rep to coulomb/kilogram,   
  • coulomb/kilogram to rep

Supported Radiation Exposure Conversions

Our calculator supports full bi-directional conversion. You can easily translate the primary SI unit (Coulomb/kilogram) to any of the following specific units, or vice versa:

  • SI Unit Prefixes: Millicoulomb/kilogram (mC/kg) and Microcoulomb/kilogram (µC/kg).
  • Standard Legacy Unit: Roentgen (R).
  • Obsolete & Historical Units: Tissue Roentgen, Parker, and Rep (Roentgen Equivalent Physical).

Understanding the Units

Coulomb per kilogram (C/kg)

The Coulomb per kilogram is the derived International System of Units (SI) measurement for ionizing radiation exposure. It measures the amount of radiation required to create one coulomb of charge of each polarity in one kilogram of dry air.

The Roentgen (R)

The Roentgen is a legacy unit introduced in 1928, primarily used to measure X-ray and gamma-ray exposure in the air. While it has largely been replaced by the SI unit in global scientific literature, it remains widely used in certain industries (like the US military and legacy medical systems). Mathematically, exactly 1 Roentgen = 0.000258 C/kg.

Tissue Roentgen, Parker, and Rep

The Rep (Roentgen Equivalent Physical) is an obsolete unit of absorbed dose introduced by physicist H.M. Parker. Due to its origins, it is sometimes referred to synonymously as the "Parker" or the "Tissue Roentgen." In standard exposure conversion tools, these legacy units map to the exact same numerical exposure rate in air as the Roentgen (0.000258 C/kg).

How to Use This Converter

  1. Select the unit you want to convert From in the first dropdown menu.
  2. Enter the numerical value of your radiation exposure.
  3. Select the unit you want to convert To in the second dropdown menu.
  4. The accurately converted exposure result will appear instantly in the result box below.

Example of radiation-exposure units conversion

  • 1 millicoulomb/kilogram [mC/kg] = 0.001 coulomb/kilogram [C/kg]
  • 1 microcoulomb/kilogram [µC/kg] = 1.0E-6 coulomb/kilogram [C/kg]
  • 1 roentgen [R] = 0.000258 coulomb/kilogram [C/kg]
  • 1 tissue roentgen = 0.000258 coulomb/kilogram [C/kg]
  • 1 parker = 0.000258 coulomb/kilogram [C/kg]
  • 1 rep = 0.000258 coulomb/kilogram [C/kg]