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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)