Figure 2.

Periodic table of the calculated time period that each element would require to decay to UK low level waste limits (<4 MBq kg${}^{-1}$ alpha radiation and <12 MBq kg${}^{-1}$ combined gamma and beta radiation) following exposure inside a DEMO fusion reactor. The component considered is the divertor over a time period equivalent to 5 years of pulsed operation. Reproduced from Gilbert et al. [15].