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Table 9:

Physical parameters of various short-period (SP) and long-period (LP) radiogenic elements considered in the model.
  Element $X_{\rm rad}$(t=0)a $\tau _{\rm rad}$b $H_{\rm rad}$c
  (years) J kg-1
SP  26Al 6.7 $\times$ 10-7 1.05 $\times$ 106 4.84 $\times$ 1012
 60Fe     2.5 $\times$ 10-7/-8 2.16 $\times$ 106 5.04 $\times$ 1012
  53Mn 2.8 $\times$ 10-8 5.34 $\times$ 106 4.55 $\times$ 1012
LP 40K 1.2 $\times$ 10-6 1.80 $\times$ 109 1.66 $\times$ 1012
232Th 6.0 $\times$ 10-8  2.02 $\times$ 1010 1.68 $\times$ 1013
235U  9.0 $\times$ 10-9 1.02 $\times$ 109 1.82 $\times$ 1013
238U  2.9 $\times$ 10-8 6.45 $\times$ 109 1.92 $\times$ 1013

Notes.  Values adapted from Castillo-Rogez et al. (2007). (a) Initial mass fraction of the radiogenic element. (b) Decay time. (c) Heat released by this radiogenic element per unit mass upon decay.


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