Radiation Exposure / mR → mC/kg
Convert Milliroentgens to Millicoulombs per kilogram
Convert photon exposure in air using charge per mass. Convert Milliroentgens (mR) to Millicoulombs per kilogram (mC/kg). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Millicoulombs per kilogram to Milliroentgens →
How to convert milliroentgens to millicoulombs per kilogram
Exposure in C/kg describes ionization in air. It is not absorbed dose in tissue or equivalent dose in sieverts. Those relationships require radiation and material information.
Use x for the value in mR, b for the intermediate value in C/kg, and y for the result in mC/kg.
mC/kg = mR × 2.58e-7 ÷ 0.001
Worked examples
10 mR ≈ 0.00258 mC/kg
Step 1: (10 × 2.58e-7) ≈ 0.00000258 C/kg.
Step 2: 0.00000258 ÷ 0.001 ≈ 0.00258 mC/kg.20 mR ≈ 0.00516 mC/kg
Step 1: (20 × 2.58e-7) ≈ 0.00000516 C/kg.
Step 2: 0.00000516 ÷ 0.001 ≈ 0.00516 mC/kg.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Milliroentgens
Milliroentgens (mR) measures radiation exposure under the conventions above. The base value in C/kg is (x × 2.58e-7), where x is the numerical value in mR. Factors shown here are rounded for display; calculations use the stored factor.
About Millicoulombs per kilogram
Millicoulombs per kilogram (mC/kg) measures radiation exposure under the conventions above. The base value in C/kg is (x × 0.001), where x is the numerical value in mC/kg. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Milliroentgens to millicoulombs per kilogram reference table
| Milliroentgens (mR) | Millicoulombs per kilogram (mC/kg) |
|---|---|
| 1 | 0.000258 |
| 5 | 0.00129 |
| 10 | 0.00258 |
| 25 | 0.00645 |
| 50 | 0.0129 |
| 100 | 0.0258 |
| 1000 | 0.258 |
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