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Radiation Exposure Converter

Convert radiation exposure between coulomb per kilogram, roentgen, milliroentgen and microroentgen.

What this tool does

Convert radiation exposure between coulomb per kilogram, roentgen, milliroentgen and microroentgen. Type an amount in roentgens, choose the units, and the tool converts it to coulombs per kilogram. It offers 4 radiation exposure units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Coulomb per kilogram, Roentgen, Milliroentgen, Microroentgen. Starts as Roentgen.
  • To: Choose one of the same 4 units as "From". Starts as Coulomb per kilogram.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from roentgens to coulombs per kilogram:

  • 1 R = 0.000258 C/kg
  • 5 R = 0.00129 C/kg
  • 10 R = 0.00258 C/kg
  • 50 R = 0.0129 C/kg
  • 100 R = 0.0258 C/kg

Multiply the number of roentgens by 0.000258 to get coulombs per kilogram. Both units are exact definitions, so 0.000258 is the exact factor: 1 R = 0.000258 C/kg.

Sources: Roentgen: NIST SP 811 (2008), Appendix B.8. Coulomb per kilogram: SI Brochure, 9th edition (2019).

Limitations

  • Converts exposure units only. Exposure measures ionization in air, not the dose absorbed by a person.

FAQs

Q: How many coulombs per kilogram is one roentgen?
A: One roentgen is exactly 2.58 × 10⁻⁴ coulomb per kilogram.
Q: How many roentgens is one C/kg?
A: About 3876 roentgens.

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