“…The Dosimetry Laboratory of Algiers Nuclear Research Center (CRNA) has undertaken, since nineties, intensive investigations in order to develop an environmental dosimeter based on CaSO 4 : Dy and CaF 2 detectors (Abdelaziz, 1991;Benkrid et al, 1992). The developed dosimeters have been used in routine mode to assess the gamma ambient dose around "Nur" and "Salam" Algerian research reactors Abdelaziz, 1991, 1999).…”