Aspirable gel for removing a contaminating species, for example a radioactive contaminating species, contained in an organic layer at the surface of a material, consisting of a colloidal solution comprising, preferably consisting of: - 1% to 25% by mass, preferably 5% to 20% by mass, for example 10% by mass, relative to the total mass of the gel, of at least one inorganic viscosity agent; - 13% to 99% by mass, preferably 80% to 95% by mass, for example 90% by mass, relative to the total mass of the gel of an organic solvent chosen from terpenes and their mixtures; - optionally, from 0.01% to 10% by mass, relative to the total mass of the gel, of at least one dye and / or pigment; - optionally, from 0.1% to 2% by mass, relative to the total mass of the gel, of at least one surfactant; - optionally from 0.1% to 10% by mass, preferably 0.1% to 5% by mass, relative to the total mass of the gel, of at least one agent extracting radionuclides, preferably chosen from zeolites and clays. Decontamination process using this gel.
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