The Fourth International Conference TANCA 2012 is held under the theme "Environment and Cultural Heritage: Inventory, Valorization and Preservation". This theme supports the growing interest in the promotion of heritage and its preservation. Mobilizing different Analytical, Nuclear and/or Conventional Techniques, this theme will ensure fruitful exchanges between skills, institutions and industries. The wish of the organizers is to create the appropriate synergy around a field by a multidisciplinary nature. Conference Topics Thematic I: Environment & Pollution Thematic II: Patrimony