An additional crewmember. Radiation on board the International Space Station is measured with the Matroshka mannequin.

The head and torso of the Matroshka mannequin are made up of a total of 33 'slices'. At the core of the torso is a synthetic human skeleton, the 'bones' of which are embedded in moulded polyurethane plastic that simulates the varying densities of human body tissue.