The invention relates to a scintillations cell for detecting ionising radiation from a potentially radioactive fluid. The scintillation cell comprises at least one first waveguide (230) having at least one surface, the surface being covered with a first layer (232) of a first scintillation material. The first waveguide (230) furthermore comprises a second layer (233) of a second scintillation material covering the first layer (232), the thickness of the second layer (233) being comprised between 1 times and 4 times the mean path of a tritium β particle in the second material, the first and second materials having at least one scintillation property that is different therebetween so as to allow their respective contributions to be distinguished. The second layer (233) being intended to be placed in contact with the fluid. The invention furthermore relates to a detecting assembly and to a detecting method.
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