📡 External Dose Rate (inverse-square)
Inverse-square external dose rate; optional Γ.
Clinical takeaway
Γ is order-of-magnitude.
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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))
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
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) | I-131 (Γ≈2.2) |
→Ḋ(d)12.5µSv/h
- Ḋ(1 m)：50 µSv/h
- d：2 m
Frequently asked questions
- What is External Dose Rate (inverse-square)?
- Inverse-square external dose rate; optional Γ.
- How is External Dose Rate (inverse-square) calculated? What is the core formula?
- Ḋ(d)=Ḋ(1m)/d².
- When is External Dose Rate (inverse-square) used?
- Distance teaching.
- What are the key clinical points for External Dose Rate (inverse-square)?
- Γ is order-of-magnitude.
- 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.
- 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) I-131 (Γ≈2.2) → Result: Ḋ(d) 12.5 µSv/h（Ḋ(1 m): 50 µSv/h, d: 2 m）
💬 Peer discussion
Licensed clinicians only — about this Tool · Dose rate 1/r²
Do not share identifiable patient information (PHI). Discuss principles and workflow only — not a substitute for clinical judgement.
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