Calculator
Plotly Graph
Example Data Table
| Scenario | Input | Gy per R | Weighting | Converted Highlight |
|---|---|---|---|---|
| Dental image estimate | 0.15 mGy | 0.00876 | wr=1, wt=1 | 15.00 mrad |
| Chest x ray estimate | 0.10 mSv | 0.00876 | wr=1, wt=1 | 10.00 mrem |
| Air exposure reading | 250 mR | 0.00876 | wr=1, wt=1 | 2.19 mGy |
| Panel calibration test | 0.50 rad | 0.00876 | wr=1, wt=1 | 5.00 mGy |
| Shielding review case | 2.50 mGy | 0.00876 | wr=1, wt=0.12 | 0.30 mSv |
Formula Used
1) Absorbed dose conversions:
1 Gy = 100 rad
1 Gy = 1000 mGy
1 rad = 10 mGy
2) Equivalent or effective dose conversions for x rays:
Equivalent Dose (Sv) = Absorbed Dose (Gy) × wr
Effective Dose (Sv) = Absorbed Dose (Gy) × wr × wt
For x rays, wr is usually 1.
3) Exposure approximation:
Absorbed Dose (Gy) = Exposure (R) × conversion factor
Default factor here is 0.00876 Gy per R.
This calculator unifies absorbed dose, equivalent dose, and exposure values. It applies the selected factors, then returns the requested target unit.
How to Use This Calculator
- Enter the measured or estimated x ray value.
- Select the source unit from the first dropdown.
- Select the target unit from the second dropdown.
- Keep the radiation weighting factor at 1 for x rays.
- Adjust the tissue weighting factor for effective dose studies.
- Set the exposure factor when converting from roentgen values.
- Click Convert Dose to display results above the form.
- Use CSV or PDF export for reporting and records.
FAQs
1. What does this x ray dose conversion calculator do?
It converts absorbed dose, equivalent dose, effective dose, and exposure values across common units. It also shows related values in Gy, mGy, rad, Sv, mSv, rem, R, and mR.
2. Why is the radiation weighting factor set to 1?
X rays have a radiation weighting factor of 1 in standard protection models. That means absorbed dose in Gy numerically matches equivalent dose in Sv before tissue weighting is applied.
3. What is the difference between Gy and Sv?
Gray measures absorbed energy per unit mass. Sievert reflects biological effect after applying weighting factors. For x rays, wr is usually 1, but effective dose may still change with tissue weighting.
4. Can I convert roentgen directly to mGy?
Yes, but it is approximate. The conversion depends on beam quality, material, calibration setup, and energy range. The calculator uses the factor you enter to perform that estimate.
5. When should I change the tissue weighting factor?
Change it when estimating effective dose for a specific organ or tissue contribution. Leave it at 1 when you only need unit conversion without risk weighting.
6. Is rad still useful today?
Rad is older but still appears in legacy reports, equipment notes, and educational references. Many laboratories and training materials still compare rad with gray values.
7. Why does the graph show several related units?
The graph helps compare the same physical case across multiple reporting units. That makes trend inspection faster during teaching, calibration reviews, or report preparation.
8. Is this calculator suitable for medical decisions?
Use it for estimation, study, and reporting support. Clinical decisions should rely on validated dosimetry methods, calibrated instruments, protocol guidance, and qualified medical physics review.