Fig. 15. Relative errors in volumetric heat capacity (C) and thermal diffusivity (k) that occur when the model of Bristow et al. (1994) (Eq. [19–20]) is used to compute k and C rather than the model with zero surface temperature (ZST, Eq. [15]) and adiabatic boundary conditions (ABC, Eq. [18]). Relative errors are shown for different (a) quantities of heat liberated (q') and (b) pulsed heat source duration (t₀) and the enlargements of the highlighted rectangular areas of (a) and (b).