“…In 1994, coinciding with the project we were working on the durability of structural precast concrete made with CAC (Chinchón et al, 1994b;Guirado et al, 1994Guirado et al, , 1998a we published also on the quantification of CAC in concrete using gamma spectrometry (Chinchón et al, 1994a). As it is shown in this study, the CAC has activity concentration values significantly higher than the PC: 130 Bq/kg the CAC for 13 Bq/kg the PC for 228 Ac and 76 Bq/kg the CAC for 27 Bq/kg the PC for 214 Pb and 214 Bi.…”