It's hard to think of many spinoffs from the $100 billion project to build and launch the International Space Station. In fact, there is precious little done on the ISS that isn't focused on just keeping the thing in orbit.

One exception is the Alpha Magnetic Spectrometer, which is designed, among other things, to determine whether cosmic ray particles are made of matter or antimatter.

The spectrometer consists of a giant magnet that deflects charged particles and a number of detectors that characterise the mass and energy of these particles. It was bolted to the ISS last year and is currently bombarded by about 1000 cosmic rays per second.

Today, Roberto Battiston at the University of Perugia in Italy and a few pals say that the technology developed for the spectrometer could be used for protecting astronauts from radiation during the long duration spaceflights in future.

The journey to the asteroids, Mars or beyond is plagued with technological problems. Among the most challenging is finding a way to protect humans from the high energy particles that would otherwise raise radiation levels to unacceptable levels.

On Earth, humans are protected by the atmosphere, the mass of the Earth itself and the Earth's magnetic field. In low earth orbit, astronauts loose the protection of the atmosphere and radiation levels are consequently higher by two orders of magnitude.

In deep space, astronauts loose the protecting effect of the Earth's mass and its magnetic field, raising levels a further five times and beyond the acceptable limits that humans can withstand over the 18 months or so it would take to get to Mars or the asteroids.

An obvious way to protect astronauts is with an artificial magnetic field that would steer charged particles away. But previous studies have concluded that ordinary magnets would be too big and heavy to be practical on a space mission.

However, superconducting magnets are more powerful, more efficient and less massive. They are much better candidates for protecting humans.

The only problem is that nobody has built and tested a superconducting magnet in space.

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Space Station Spin-Off Could Protect Mars-Bound Astronauts From Radiation