Abstract: A process for the treatment of a substrate made of lignocellulosic material for the adsorption of radionuclides in fluids that are loaded with radionuclides, includes carrying out the following stages: preparation of lignocellulosic material that is divided by rinsing and subjected to granulometric sorting; submission of the lignocellulosic material to an oxidation; activation of the material by an acid treatment; and rinsing. The oxidation is more particularly a Fenton reaction. A method of using the lignocellulosic material treated by the process is also described.

Abstract: The object of the invention is a detector (20) of radon and its daughter products that are present in the ambient air, including in particular aerosols, characterized in that it comprises: A silicon pellet that integrates a PN junction with a deserted zone, designed to emit signals under the action of the radiation that is emitted by said radon and said daughter products, A passivation layer (22) that covers this silicon pellet and that makes it possible for the detector to work in the open air, and A conductive layer (24) that covers the passivation layer and that forms an electrode for collecting radionuclides. The invention also covers the detection device that includes said detector.