How to use the radiation dose rate vs distance calculator
Estimate the radiation dose rate at a new distance from a point source using the inverse-square law. Enter dose rate at reference distance, reference distance, new distance in the fields above; the dose rate at new distance, dose rate in msv/h are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “inverse square radiation”, “dose falls with distance”, “source distance dose”, “calculate radiation dose rate vs distance”, “find dose rate at new distance”.
Formula
Variables
- D1 — Dose rate at reference distance (µSv/h)
- d1 — Reference distance (m)
- d2 — New distance (m)
Worked example
With dose rate at reference distance = 100 µSv/h, reference distance = 1 m, new distance = 4 m, the calculator gives dose rate at new distance ≈ 6.25 µSv/h; dose rate in msv/h ≈ 0.00625 mSv/h.
Frequently asked questions
What is the radiation dose rate vs distance calculator used for?
Estimate the radiation dose rate at a new distance from a point source using the inverse-square law. It helps with questions such as “inverse square radiation”, “dose falls with distance”, “source distance dose”.
What is the formula for the radiation dose rate vs distance calculation?
Dose rate at new distance (µSv/h) = D1 × (d1 / d2)^2. Dose rate in mSv/h (mSv/h) = [Dose rate at new distance] / 1000. Here D1 is dose rate at reference distance (µSv/h), d1 is reference distance (m), d2 is new distance (m).
What inputs do I need for the radiation dose rate vs distance calculator?
You need dose rate at reference distance in µSv/h, reference distance in m, new distance in m. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the radiation dose rate vs distance calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the radiation dose rate vs distance result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.