spacetoday.net: space news from around the webin association with SpaceNews


ISS radiation shielding not as good as hoped
Posted: Thu, Oct 24, 2002, 9:04 AM ET (1304 GMT)
ISS illustration (NASA) Upgraded radiation shielding on the International Space Station is not working as well as expected, New Scientist reported Wednesday. According to the report, radiation levels within the station are about one millisievert per day, about the same amount of radiation one would get on the ground from natural sources in one year. Those levels are within a few percent of those measured on Mir despite the use of new shielding on the station designed to lower radiation levels. The primary source of the radiation is the collision of cosmic rays with aluminum atoms in the hull, creating a shower of particles. The new shielding uses polyethylene, whose lighter atomic nuclei were designed to reduce the amount of secondary particles released in collisions. Experts told New Scientist that a whole new type of shielding may be required for future missions beyond the Earth's protective magnetosphere, which shields the ISS of high-speed particles from the Sun.
Related Links:
<<previous article   next article>>
news in brief
Soyuz launches missile early warning satellite
Posted: Sun, May 24 10:55 AM ET (1455 GMT)

H-2B launches HTV cargo spacecraft
Posted: Sun, May 24 10:53 AM ET (1453 GMT)

NASA human spaceflight head abruptly resigns
Posted: Sun, May 24 10:52 AM ET (1452 GMT)

news links
Wednesday, May 27
OneWeb applies to FCC for bigger fleet authorisation
Telecompaper — 7:21 am ET (1121 GMT)
NASA eyes Aug. for SpaceX ship liftoff with Japanese astronaut aboard
Kyodo International — 7:16 am ET (1116 GMT)


about spacetoday.net   ·   info@spacetoday.net   ·   mailing list