Notes. ^(a) Calculated by multiplying the corresponding concentrations (upon planet formation and at the present day) with the heat generation rates, h, of individual radionuclides (see Table 3). ^(b)We refer to the mantle concentrations of Wang et al. (2018) (Col. 3 of their Table 1), based on which the radioactive elemental concentrations are converted into the radionuclide concentrations by adopting ²³²Th/Th = 1, ²³⁵U/U = 0.0072, ²³⁸U/U = 0.9928, and ⁴⁰K/K = 1.19 × 10⁻⁴ (Turcotte & Schubert 2002) for the present-day bulk silicate Earth. ^(c) C₀ = C_t × e^{t ln 2∕T_1∕2}, where C₀ and C_t represent the abundances of a radionuclide upon the Earth formation (t = 4.56 Ga) and at the present day, respectively; T_1∕2 is given in Table 3. ^(d) X/Mg = C₀(X)/C₀(Mg), which refers to the early stage of Hadean Earth (i.e. upon the planet formation); C₀ (Mg) = C(Mg) = 22.3 ± 0.2% (Wang et al. 2018), i.e. the concentration of Mg is kept unchanged over gelogical time.