Radiation Exposure Converter
Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 C/kg = 3,875.969 R; 1 C/kg = 3,875,969 mR; 1 R = 0.000258 C/kg. This converter covers 5 radiation exposure units.
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Use the Radiation Exposure Converter
Radiation Exposure formula and what each symbol means
target = value × (factor of starting unit ÷ factor of target unit), where each factor is the unit value in C/kg.
| Symbol | Meaning |
|---|---|
| value | The number you want to convert |
| factor | The unit’s size expressed in the base unit (C/kg) |
Radiation Exposure examples
C/kg to R
10 C/kg = 38,759.69 R.
C/kg to mR
10 C/kg = 38,759,690 mR.
R to C/kg
10 R = 0.00258 C/kg.
How to calculate Radiation Exposure step by step
- Choose the starting unit and the target unit.
- Enter your value.
- Read the converted value, plus the conversion factor in both directions.
Popular radiation exposure conversions
How to read your Radiation Exposure result
Radiation exposure measures ionisation of air by X-rays or gamma rays. The SI unit is coulomb per kilogram. One roentgen is exactly 2.58×10⁻⁴ C/kg.
| UNIT | SYMBOL | EQUALS | VALUE OF 1 C/KG |
|---|---|---|---|
| Coulomb per kilogram | C/kg | 1 C/kg = 1 C/kg | 1 C/kg |
| Roentgen | R | 1 R = 0.000258 C/kg | 3,875.969 R |
| Milliroentgen | mR | 1 mR = 2.58×10⁻⁷ C/kg | 3,875,969 mR |
| Microroentgen | µR | 1 µR = 2.58×10⁻¹⁰ C/kg | 3,875,969,000 µR |
| Millicoulomb per kilogram | mC/kg | 1 mC/kg = 0.001 C/kg | 1,000 mC/kg |
Common mistakes when calculating Radiation Exposure
- Confusing exposure (R, C/kg) with absorbed dose (Gy).
- Mixing R and mR, which differ by 1,000.
- Assuming 1 R equals 1 rem in every case.
Radiation Exposure FAQ
How many C/kg is 1 R?
Exactly 2.58×10⁻⁴ C/kg.
How many mR is 1 R?
1 R is 1,000 mR.
What does exposure measure?
The charge produced by ionising radiation in a mass of air.
What is the base unit for radiation exposure?
This converter uses coulomb per kilogram (C/kg) as the common base unit: every value is first converted to it and then to the target unit.
How do I convert between two radiation exposure units?
Choose the starting and target units, enter the value and read the result. By hand: convert to the base unit with the table, then divide by the target unit factor.
How many roentgens are in 1 coulomb per kilogram?
1 C/kg = 3,875.969 R.
How many milliroentgens are in 1 coulomb per kilogram?
1 C/kg = 3,875,969 mR.
How many coulombs per kilogram are in 1 roentgen?
1 R = 0.000258 C/kg.
Which radiation exposure units does this converter support?
It covers 5 units: coulomb per kilogram (C/kg), roentgen (R), milliroentgen (mR), microroentgen (µR), millicoulomb per kilogram (mC/kg).
How accurate is the radiation exposure converter?
Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.
More in Radiation Exposure converters
- Milliroentgens to Roentgens Converter
- Roentgens to Milliroentgens Converter
- Milliroentgens to Coulombs per kilogram Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST: SI units and derived units, NIST SP 811, Appendix B.8: conversion factors