T         T (years) N T1 T2 T3 T4 T5 T6 T7 .   T1 N1 N1F1 N1F2 N1F3 N1F4 N1F5 N1F6 N1F7 . . T2 N2   N2F1 N2F2 N2F3 N2F4 N2F5 N2F6 . . T3 N3     N3F1 N3F2 N3F3 N3F4 N3F5 . . T4 N4       N4F1 N4F2 N4F3 N4F4 . . T5 N5         N5F1 N5F2 N5F3 . . T6 N6           N6F1 N6F2 . . T7 N7             N7F1 . . . .               . . Total risk  å                   Ni is a DNA damage factor; Fi is a cancer risk factor

Table 1: Life Matrix. The principle construction of the life matrix is where the risk function, Fi, is multiplied by the brain DNA damage factor, Ni, and then summed vertically for each calendar year.