“…This corresponds to the indirect recoil fraction of the emanation factor (E indirect ). Finally, radon atoms that were not able to enter the pore space by recoil may still reach it by diffusion through the solid phase, which is a temperature dependent process (e.g., Beckman and Balek, 2002;Beckman et al, 2004). This is the diffusive component of the emanation process (E diffusion ).…”