# Effective dose coefficient

A measure of the hazard of nuclear material is provided by the toxicity and in particular its radiotoxicity arising from its radioactive “quality” rather than the chemical toxicity. The radiotoxicity of a nuclide is determined by its effective dose coefficient *e*(T), which accounts for radiation and tissue weighting factors, metabolic and biokinetic information. The quantity T is the integration time in years following intake. For adults, the integration time is 50 years, such that the radiotoxicity (in Sievert, Sv) or committed effective dose resulting from intake of a particular nuclide is the product of the effective dose coefficient (units Sv/Bq) and the activity (in Bq) of that nuclide i.e.

Committed effective dose = Activity · *e*(50).

The two main pathways for intake of a radionuclide are through ingestion and inhalation. Accordingly one can differentiate between the ingestion dose coefficient *e*_{ing}(50) and the inhalation does coefficient *e*_{inh}(50) for inhalation.

**References**

The effective dose coefficients given in the Nucleonica databases are taken from:

See Also... Biological Effect of Ionising Radiation, Effective dose, Equivalent dose, Committed effective dose, Committed equivalent dose, Risk factor, Radon dose conversion factors