Radiation Dose Rate Calculator
Calculate radiation dose rate and total accumulated dose from source activity, distance, and exposure time, with unit conversion between mSv, mrem, mGy, and rad.
Source Parameters
Dose Rate
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mSv/h
Total Accumulated Dose
—
mSv
Annual Occupational Limit Context (50 mSv/year)
All Unit Conversions
| Unit | Dose Rate | Total Dose |
|---|
Enter source parameters and click Calculate to see results.
This tool is for educational and planning purposes only. Results assume an unshielded point source in air using the inverse square law. Consult a qualified medical physicist or health physicist for clinical, occupational, or regulatory decisions.
Summary
Calculate radiation dose rate and total accumulated dose from source activity, distance, and exposure time, with unit conversion between mSv, mrem, mGy, and rad.
How it works
- Select a common radioactive isotope or enter a custom gamma factor.
- Enter the source activity in MBq or mCi.
- Enter the distance from the source in meters or feet.
- Enter the exposure time in hours, minutes, or seconds.
- The calculator applies the inverse square law: Dose Rate = Activity × Gamma Factor / Distance².
- Total dose is computed as Dose Rate × Exposure Time, then displayed in your chosen unit.
Use cases
- Radiation safety planning for workers handling radioactive sources.
- Nuclear medicine technologists estimating patient or staff exposure.
- Health physics professionals verifying regulatory dose limits.
- Academic and training exercises on inverse square law calculations.
- Estimating shielding requirements for radioactive storage areas.
- Converting dose readings between mSv, mrem, mGy, and rad.