The invention relates to a package (1) comprising a package (2) for transporting, storing and / or storing radioactive material (3). An assembly containing the radioactive material (3) is housed in a cavity (5) of the package. The package (1) comprises at least one axial wedging device (8) of the assembly containing the radioactive material in the cavity (5) of the packaging. The axial wedging device (8) comprises at least one actuator (9) of shape memory material which is configured to extend, when its temperature exceeds an activation temperature, causing deployment of the axial wedging device ( 8) in an axial direction (XX) of the packaging.
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