Activation analysis has been made for the US ITER design. The radioactivity and the decay heat have been calculated, during operation and after shutdown for the two ITER phases, the Physics Phase and the Technology Phase. The Physics Phase operates about 24 full power days (FPDs) at fusion power level of 1100 MW and the Technology Phase has 860 MW fusion power and operates for about 1360 FPDs. The point-wise distributions of the decay gamma sources have been calculated everywhere in the reactor at several times after the shutdown of the two phases and are then used to calculate the biological dose everywhere in the reactor. Activation calculations have been made also for ITER divert or. The results are presented as a function of continuous operation times and for only one pulse. The effect of the pulsed operation on the radioactivity is analyzed.