In the clinical practice of radiotherapy,how to quickly,safely,accurately and economically monitor the irradiation dose or implement quality assurance measures before irradiation has always been a research hotspot in this research field. In this study,the reaction between nitrate ions and free radicals produced by water radiolysis was innovatively used as a dose-response mechanism. A radiation-grafted silica gel acrylic composite was selected as a matrix material to develop a tough radiation composite hydrogel dosimeter with high mechanical strength. The experimental results showed that the hydrogel dosimeter exhibited the best dose-response linear correlation under a sodium nitrate concentration of 0.5 mol/L and sodium formate concentration of 2.5×10^-3 mol/L. In addition,the prepared hydrogel dosimeter not only exhibited excellent puncture resistance,non-brittleness,high pressure resistance,and adjustable mechanical properties,but also displayed impressive time stability in practical applications,indicating potential for commercialization.