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Table 2 Rates of heat release H and half-lives of the radioactive isotopes

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

  
  1. These parameters are from Turcotte and Schubert (2002)