"Radiation is an important variable in extra-vehicular activities," said CSA astronaut Chris Hadfield, the first Canadian to perform an EVA. "EVARM will provide information on radiation exposure that will help in the planning of future EVAs, enhancing the safety of astronauts working in space. I congratulate Thomson Nielsen on this innovative technology."

In order to measure radiation levels during the spacewalk portion of a mission, small electronic badges will be placed inside astronaut EVA suits. The devices will record the amount of radiation reaching various locations on an astronaut's body while he or she works outside the shuttle or the International Space Station.

"We are proud that our technology will be able to help resolve long unanswered questions regarding EVAs and space radiation," said Ian Thomson, the President of Thomson Nielsen and the Principal Investigator of EVARM. "Moreover, our work will not only help astronauts, but people on Earth as well. We have already used the technology behind EVARM in the development of a radiation monitor that can be used by medical practitioners for cancer patients."

The EVARM equipment hardware will be carried to the International Space Station during NASA's next space misison STS-108, scheduled for launch on November 29, 2001. The actual experiments will be conducted during subsequent missions.

EVA And Radiation Management
For more than three decades, astronauts have been leaving their spacecraft to perform spacewalks, or extravehicular activities (EVA). Now, a new Canadian Space Agency experiment will allow researchers to measure the radiation astronauts receive while they work outside in the space environment.

While on a spacewalk outside the space shuttle or the International Space Station (ISS), astronauts have only their EVA suit to protect them from the hazards of space. Not only does the suit provide them with air and a pressurized environment, it is their only source of protection from the dangerous radiation that streams from the sun or from farther regions of space.

On Earth, our atmosphere shields us from most of that radiation. Astronauts on EVA, however, do not have the atmosphere to protect them so they are exposed to significantly higher levels of radiation than the average person on the ground.

Measurements of radiation doses received only during the EVA have never been taken, so EVARM will be the first experiment to collect this type of data. Small electronic devices developed by Ontario's Thomson Nielsen will be placed in EVA suits to record the radiation astronauts encounter on their spacewalks.

These badges, about the size of matchboxes, will be worn in three different locations inside the astronauts' suits, enabling researchers to determine the amount of radiation reaching different parts of the astronauts' bodies. The data obtained by these badges will also be examined in relation to the astronaut's location with respect to the Station at the time of the readings.

The results obtained from EVARM will help researchers to better understand how to protect our astronauts while they work in earth orbit. EVARM will allow a much more precise estimation of an astronaut's radiation exposure during EVA, and it will provide the data necessary to more accurately predict radiation exposure on future flights. These factors will be key to keeping astronauts safe on future missions.

EVARM also has important applications on earth. The technology behind the project has already been used by Thomson Nielsen in the development of a monitor for medical practitioners involved in cancer radiation treatments. Health care professionals such as doctors, radiation therapists and technicians are able to benefit from real-time skin-specific radiation monitoring of cancer patients based on the technology used in EVARM.

The EVARM equipment hardware will be carried to the ISS on STS-108, scheduled for launch November 29, 2001. The actual experiments will be conducted during subsequent missions.

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