Radiation levels in the ITER tokamak complex during and after plasma operation

•Neutronics and 3-D activation simulations of the ITER complex.•Simulated radiation sources included D–T fusion neutrons exiting the cryostat.•Modelling work also includes gamma rays arising from activation of cooling water.•Novel capabilities include a secondary neutron cylinder source representation.•Smeared source and moving geometry capabilities created for cask transfer modelling.•Results have been incorporated into the ITER radiation maps tool.