1. Immersion decontamination method for the bio-decontamination of objects (4) by means of a reactive gas (R), comprising the following steps:
• Generating a reactive gas (R) from a process gas by igniting a plasma, wherein ambient air is used as the process gas and the reactive gas (R) comprises nitrogen dioxide (N02), and wherein the reactive gas (R) has a higher density than air at the same pressure and temperature,
• Filling a container (3) with the reactive gas (R) so that the container (3) is almost completely or at least partially filled with the reactive gas (R),
• Bio-decontamination of the objects to be treated (4) in the container (3) by means of the reactive gas (R), wherein the objects to be treated (4) are lowered into the container (3) filled with reactive gas (R) so that the objects to be treated are completely covered by the reactive gas, wherein, after a decontamination period has elapsed, the objects to be treated are removed from the container,
• wherein, after the decontamination time has elapsed, the objects are flushed with a flushing gas at a flushing position in order to remove the reactive gas, so that residues of the reactive gas are removed from the objects to be treated.