📡 External Dose Rate (inverse-square)
UseDistance teaching.
Loading calculator…
SourceInverse-square; published Γ (e.g. I-131 ≈2.2 R·cm²/(mCi·h))
Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Scene next step
📋med safetyOpen scene pack →Related scores
Score + version; reference only — not a substitute for care · no HIS write
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Methodology · worked example, guidelines & full notes
Clinical takeaway
Γ is order-of-magnitude.
When to use
Distance teaching.
How it works
Ḋ(d)=Ḋ(1m)/d².
Key points
- Γ is order-of-magnitude.
References
- Inverse-square; published Γ (e.g. I-131 ≈2.2 R·cm²/(mCi·h))
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Dose rate at 1 m | 50 µSv/h |
|---|---|
| Distance | 2 m |
| unit | mCi |
| Nuclide (optional Γ) | Tc-99m (Γ≈0.78) |
→Ḋ(d)12.5µSv/h
- Ḋ(1 m)：50 µSv/h
- d：2 m
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using External Dose Rate (inverse-square)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does External Dose Rate (inverse-square) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is External Dose Rate (inverse-square) calculated in practice? Can you show a worked example?
- Inputs: Dose rate at 1 m 50 µSv/h, Distance 2 m, unit mCi, Nuclide (optional Γ) Tc-99m (Γ≈0.78) → Result: Ḋ(d) 12.5 µSv/h（Ḋ(1 m): 50 µSv/h, d: 2 m）