⚡ Health Physics & Air Ionization
Radiation Exposure (Roentgen vs C/kg) Converter
Convert ionizing air radiation exposure ($X = dQ/dm_{\text{air}}$) across Roentgens ($\text{R}$), Coulombs per kilogram ($\text{C/kg}$), Milliroentgens ($\text{mR}$), and $\mu\text{C/kg}$.
🌌 Cosmic Air (10 µR)
⚠️ Boundary Limit (2 mR)
🧪 1 Roentgen (258 µC/kg)
☠️ Lethal Exposure (500 R)
Input Air Exposure
Standard SI Exposure (C/kg)
2.580 × 10⁻⁴ C/kg
Roentgens (R)
1.000 R
µC / kg
258.0 µC/kg
Milliroentgens
1,000 mR
💡 Exposure Definition:
$$1\text{ Roentgen (R)} = 2.58 \times 10^{-4}\text{ C/kg} = 258\text{ }\mu\text{C/kg} = 1,000\text{ mR}$$
Understanding Radiation Exposure ($X$)
Exposure ($X$) measures the total electrical charge of ions of one sign produced in air by X-rays or gamma radiation per unit mass of dry air:
- Definition: $$X = \frac{dQ}{dm_{\text{air}}}$$
- SI Standard: Coulombs per kilogram ($\text{C/kg}$).
- Roentgen (R): Named after Wilhelm Röntgen, defined as the quantity of radiation that produces $1\text{ esu}$ of charge in $1\text{ cm}^3$ of dry air at $0^\circ\text{C}$ and $1\text{ atm}$ ($\equiv 2.58 \times 10^{-4}\text{ C/kg}$).