Depths dose measurements in a human phantom  MATROSHKA is an ESA
project that is realized under the direction of the DLR in
collaboration with industrial partners DTM technologies (Modena)
and Kayser-Italia (Livorno). MATROSHKA is a facility that
simulates as exact as possible an astronaut while he leaves the
'protective' area of the spaceship in order to carry out work in
free space. The task is to measure particle fluence and energy
spectra, dose and dose rates outside and inside a human phantom
over the period of a year. The data are needed to improve the
determination of radiation exposure of an astronaut performing a
space walk.  The MATROSHKA facility basically consists of a
human phantom, a Base Structure and a Container. The container
as well as the phantom will be mounted to the base structure
which serves as a footprint for the human phantom. The container
is a Carbon Fiber structure and forms with the Base Structure a
closed volume that contains a dry oxygen atmosphere and protects
the phantom agai