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Disclaimer: This software is for radiation protection education, screening calculations, and professional support only. It does not replace qualified health physicist judgment, regulatory requirements, approved procedures, emergency response tools, or formal shielding design review. Exposure, absorbed dose, equivalent dose, and effective dose are distinct quantities; do not equate R and Sv without explicit context and assumptions.

Time–distance

ALARA: maximize distance, minimize time, use shielding, and verify with measurements.

uSv/h
m
m
min
µSv

Uses Time ≈ Limit / Ṫ with Ṫ at the new distance on a µSv/h basis internally. For formal limits, use approved procedures.

Results

Dose over time (at new distance)
0.625000 µSv
New dose rate
1.25000 uSv/h
Dose reduction factor (dose rate ratio)
4.0000
Time to reach screening dose limit
800.000 h at 1000 µSv with constant new dose rate

Dose = DoseRate * Time; DoseRate2 = DoseRate1 * (D1/D2)^2

Dose rate vs new distance (inverse square from model)

No chart data for current inputs.