Radiation Dose

Time, distance, shielding — the three rules of radiation safety. See how dose builds with exposure and falls with the square of distance.

Radiation DoseLive

exposure, distance & time

Your dose vs common references (mSv, log scale)

Your exposure

0.0031

Dental X-ray

0.0050

Chest X-ray

0.10

Annual limit (public)

1.00

CT scan

7.00

Annual limit (worker)

20.00

Controls

Presets

Source activity (MBq)

Distance (m)

Exposure time (hr)

The three ways to reduce radiation dose are time, distance, and shielding. Dose builds with exposure time but falls with the square of distance — doubling your distance quarters the dose. Effective dose in millisieverts lets you compare any exposure to everyday references like a chest X-ray or the annual background dose. Educational estimate only.

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Data Inspector

Dose rate0.0031 mSv/hr

Total dose0.003 mSv

≈ bananas31

Risk levelvery low

Governing equation

D = \frac{Γ A}{r ^{2}} t = \frac{8.4 \times 1 0 ^{- 5} \cdot 37}{1 ^{2}} \cdot 1 = 0.003 mSv

Reading this result: At 1 m for 1 h the estimated dose is 0.003 mSv — about 31 banana-equivalents, a low everyday-scale exposure.

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How it works

Radiation dose accumulates with exposure time but drops with the inverse square of distance, so doubling your distance quarters the dose. Effective dose in millisieverts lets any exposure be compared to everyday references — a dental X-ray, a CT scan, or the annual dose limits for the public and radiation workers. Educational estimate only, not a health-physics assessment.

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Frequently asked questions

Is this radiation dose calculator tool really free?▾

Yes. Radiation Dose runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.

Do I need to install anything?▾

No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.

Can I save or share my simulation?▾

Create a free account to save projects, and use a shareable embed or minted DOI to publish a live, interactive version anywhere.

How accurate are the results?▾

The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.