From: Evolution of the rheological structure of Mars
H (W/kg)
Half-lives τ (yr)
Abundance ratio (%)
238U
9.46 × 10−5
4.47 × 109
99.28
235U
5.69 × 10−4
7.04 × 108
0.71
U
9.81 × 10−5
232Th
2.64 × 10−5
1.40 × 1010
100
40K
2.92 × 10−5
1.25 × 109
0.0119
K
3.48 × 10−9