3D dosimetric device and method for the dose verification in radiotherapy and for the quality controls of radiation beams by means of the electron paramagnetic resonance (EPR) reading of the radioinduced signal, in which the dosimetric material consists of a polymeric matrix that incorporates nanometric microporous crystals of inorganic material, characterized in that the microporous polymeric matrix that incorporates nanometric microporous crystals of inorganic material is alginate.
