 UK  Environment Agency R&D128 - 2001  Spreadsheet model for limited number of radionuclides  Comparatively limited review to derive CR values  Dosimetry methods similar to later approaches  Environment Agency Sp1a – 2003  Supports R&D128 including derivation of complete CR data sets using a ‘guidance approach’ (can be extremely conservative) www.ceh.ac.uk/PROTECT