This paper reviews several modern decontamination methods for radiological and chemical warfare agents. For a better understanding of the interaction mechanism between the toxic agent decontaminant solutions, basic principles of decontamination were explained. Index Terms-Chemical warfare agent (CWA), radioactive warfare agent (RWA), decontamination, contamination, nuclear fallout I. INTRODUCTION The contamination consists in any form of undesirable toxic material that is accumulated, retained or deposited on surfaces, equipment, structures, large areas, and even on living beings, therefore it is limiting the personnel activities and usage of surfaces. After the contamination occurs, the surfaces of the materials and equipments become