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Internal Radiation Dose (Ingestion) Calculator

Pick a radionuclide and enter the becquerels of radioactive material ingested from food or water to estimate an adult's committed effective dose in mSv and µSv. Supports key nuclides such as cesium-137 and iodine-131.

Input

Choose a radionuclide and enter the amount of radioactive material ingested (in becquerels) to estimate an adult's committed effective dose. This is an approximation based on published ICRP effective dose coefficients.

Radionuclide
Bq

Selected radionuclide: Cesium-137 (Cs-137) (Half-life about 30 years. A key radionuclide in nuclear accidents.)

Result

Committed effective dose (estimate)

1.3mSv

Radionuclide

Cesium-137 (Cs-137)

Dose coefficient (adult, ingestion)

1.30e-8 Sv/Bq

Ingested amount

100,000 Bq

Effective dose (mSv)

1.3 mSv

Effective dose (µSv)

1,300 µSv

Effective dose coefficients by radionuclide (adult, ingestion)

RadionuclideDose coefficient (Sv/Bq)
Cesium-137 (Cs-137) (selected)1.30e-8
Cesium-134 (Cs-134)1.90e-8
Iodine-131 (I-131)2.20e-8
Strontium-90 (Sr-90)2.80e-8
Potassium-40 (K-40)6.20e-9
Polonium-210 (Po-210)1.20e-6
Plutonium-239 (Pu-239)2.50e-7

These results are estimates only. Actual radiation doses and health effects vary with age, the form of intake, chemical form and other factors. For any decision requiring expert judgment, always consult medical professionals and official sources such as your national radiation protection or health authorities.

How it works

  • The committed effective dose is calculated as: effective dose (Sv) = ingested amount (Bq) × dose coefficient (Sv/Bq). It represents the total dose estimated to be received over a lifetime from a single intake.
  • The dose coefficients are representative adult ingestion values published by the ICRP (International Commission on Radiological Protection). Coefficients differ by age group (infants, children, etc.) and the form of intake.
  • Example coefficients: cesium-137 = 1.3×10⁻⁸, cesium-134 = 1.9×10⁻⁸, iodine-131 = 2.2×10⁻⁸, strontium-90 = 2.8×10⁻⁸ Sv/Bq. The dose per becquerel varies greatly between radionuclides.
  • The result is an approximation based on the formula. Actual exposure depends on concentration in food, intake frequency, biokinetics and other factors.
  • 1 mSv = 1,000 µSv = 0.001 Sv. In many countries the reference limit for additional public exposure is around 1 mSv per year.
  • This tool provides estimates only. For evaluating health effects or deciding on concrete actions, always consult official and expert sources such as your national radiation protection authority, health ministry or medical institutions.