Polyacrylamide acrylonitrile magnesium silicate {P (Am-AN)-MgSi} & polyacrylamide acrylic acid magnesium silicate {P (Am-AA)-MgSi} hybrid composites were fabricated utilizing gamma-radiation polymerization initiated about 30 kGy. Different types of dosimetric radiation-induced polymeric composites were irradiated by cesium-137 gamma-ray dose to show its possibility for use as a thermoluminescence dosimeter. The prepared polymeric composites showed useful properties such as good dosimetric and thermal stability behaviors. The mechanical behavior of the samples was measured non-destructively by the ultrasonic pulse-echo technique. It was found that the addition of P (Am-AA) with higher elastic moduli to MgSi with lower ones are produced in the {P (Am-AA)-MgSi} composite sample with a midway value for Young’s modulus of 7.13 GPa and shear modulus of 2.71 GPa. Dissimilar in the {P (Am-AN ).