The organ committed dose HT(t) for an incorporation at the time t0 is the time integral of the organ dosedose rate in the tissue or organ T:

HT(t) average organ dosedose rate in tissue or organ T at the time t

period in years over which the integration is effected. If no value is in dicated for t, a period of 50 years for adults and the period from the respective age to the age of 70 years for children are taken as a basis.
The unit of the organ committed dose is sievert (symbol: Sv).