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Effective dose

The limiting quantity effective dose (E) represents the risk of cancer due to exposure to ionizing radiation. The corresponding unit is sievert (Sv).

The effective dose is obtained by multiplying the equivalent dose (HT) for each organ by the tissue weighting factor (wT) for that organ, and subsequently sum all the products:

E = ∑ wT×HT

In order to reduce the risk of stochastic radiation effects to an acceptable value, the Decree on Basic Standards Radiation Protection poses a limit on the anual effective dose (see table below).

category limit E (in mSv/year)
exposed A-worker 20
exposed B-worker 6
other worker 1
unborn child 1
member of the public 1

Related dose quantities:

Last modified:15 January 2021 4.01 p.m.
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