Polusulfone scintillation proximity membranes of a double-layered structure wereprerared with Cerium Activated Yttrium Silicate (CAYS) impregnated in a membranestructure. Using the prepared membranes, the radioactivity of an area contamintedby radionuclids can be monitored without any scintillation cocktail The membranewere fromed through two separate casting and coagulation processes. The transparentand dense support layer was obtained by solidifying a polysulfone-methylene chloridebinary solution through vacuum. CAYS-dispersed polymer solutions were cast over the top of solidified, transparent polymer films and coagulated by immersing into acoagulation bath, containing either water or isopropanol. The prepared membranesconsist of double layers. The bottom laver is a dense. pure polymer film. and thetop works as an active layer to detect a radioactive contamination .The membrane structures are significantly different depending on the nonsolvent type.