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ISS to receive experimental figurehead during spacewalk

Radiation

Even though Matroshka can be seen as a figurehead for the ISS there is a serious purpose behind its existence. For the year that it will be located outside of the ISS this experiment facility will be measuring the radiation doses that would be experienced by astronauts during spacewalks.

The levels of radiation inside the Station are well documented though the levels experienced by astronauts outside of the ISS are still unclear. In order to determine precise measurements, Matroshka simulates the human body within a spacesuit as closely as possible.

Layers

The Matroshka experiment facility consists of several different layers, hence the reason for naming it after the famous Russian matrioshka dolls. The simulated human element of the experiment is called the Phantom. It is composed of natural bone and a material, which closely resembles natural tissue. A lower-density material is used to simulate the lungs. These 'tissue' layers are covered with a simulated skin layer. The Phantom is itself housed in an external container, which represents a spacesuit.

Radiation sensors are placed in and around the Phantom at different key organ locations such as the stomach, lungs, colon, eyes and skin and also within the spacesuit element. Knowing the radiation doses suffered by sensitive body organs is crucial for assessing the hazards from cosmic radiation.

Spacewalk

The Expedition 8 crew will attach the Matroshka experiment to the outside of the ISS during a spacewalk. This will be the first time that a spacewalk has been carried out on the ISS involving the entire crew. Since the grounding of the Shuttle after the Columbia accident, the ISS Expedition crews consist of two members instead of three. Normally at least one crewmember would remain in the Station during a spacewalk.

This means that it will be the first time since November 2000 that there will be no crew inside the In
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Contact: Dieter Isakeit
dieter.isakeit@esa.int
31-071-565-5451
European Space Agency
25-Feb-2004


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