Calculator Inputs
Example Data Table
These examples show typical inputs and computed equivalents.
| Absorbed Dose | Radiation | Weighting (wR/Q) | Equivalent Dose | Notes |
|---|---|---|---|---|
| 2 mGy | Gamma / X-ray | 1 | 2 mSv | Low weighting, common shielding checks. |
| 0.05 mGy | Alpha | 20 | 1 mSv | High weighting; contamination control matters. |
| 0.1 mGy | Neutron (2 MeV) | Energy-based | Varies | Depends on selected energy parameter. |
Formula Used
- Absorbed dose: D in gray (Gy).
- Equivalent dose: H = D × wR × N where wR (or Q) weights radiation type, and N is an optional modifying factor.
- Unit conversions: 1 rad = 0.01 Gy, and 1 Sv = 100 rem.
- Optional effective dose (simplified): E = H × wT × fraction for a single tissue weighting factor wT.
Neutron weighting uses an energy-dependent curve. If you need compliance-grade reporting, use accredited procedures and instrumentation.
How to Use This Calculator
- Enter the absorbed dose and choose the correct dose unit.
- Select the radiation type; add neutron energy when needed.
- Keep factor mode on weighting, or supply a custom Q.
- Optionally enter uncertainty and exposure time for dose rate.
- Press Submit to view results above the form.
- Use the download buttons to export CSV or PDF.
FAQs
1) What is dose equivalent in engineering terms?
Dose equivalent adjusts absorbed dose using a radiation weighting or quality factor. It reflects relative biological effectiveness for different radiation types in protection calculations.
2) When should I use neutron energy input?
Use neutron energy whenever neutrons are present. Weighting varies with energy, so a single fixed factor can misstate the equivalent dose, especially across broad spectra.
3) Why are Gy and Sv different units?
Gray measures absorbed energy per mass. Sievert applies weighting to reflect radiation type’s relative impact. Sv is used for protection limits and risk-oriented summaries.
4) What does the modifying factor (N) represent?
N is an optional multiplier for site-specific modeling factors, such as operational assumptions or conservatism. If unsure, keep N at 1 to avoid unintended bias.
5) How is dose rate calculated here?
If you enter exposure time, the calculator divides the equivalent dose by the time in hours. This produces an average Sv/h rate, useful for planning and controls.
6) Is the effective dose result compliance-ready?
No. The effective dose section is a simplified single-tissue estimate. Compliance-grade effective dose requires summing weighted equivalent doses across multiple tissues and validated methods.
7) Can I use rem outputs for older reports?
Yes. The calculator converts using 1 Sv = 100 rem. You can select rem or mrem output to match legacy documentation while still computing internally in SI units.
8) Why do I see “varies” in the neutron example table?
Neutron weighting depends on energy. The example indicates that selecting a specific energy changes the computed weighting factor, and therefore changes the equivalent dose.
Downloads
After you run a calculation, you can export:
- CSV for spreadsheets and logs.
- PDF for printable audit trails.