ISS radiation shielding not as good as hoped
Posted: Thu, Oct 24, 2002, 9:04 AM ET (1304 GMT)
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.
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.
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Tuesday, March 2
Satellite data company Spire goes public via SPAC, adding to a growing list of public space plays
CNBC — 4:44 am ET (0944 GMT) Satellite constellation operator Spire Global to go public via $1.6 billion SPAC
TechCrunch — 4:44 am ET (0944 GMT) Spire Global Merges with NavSight Holdings to go Public
WashingtonExec — 4:42 am ET (0942 GMT) Rocket Lab set to launch publicly in $4.1 billion SPAC merger
Reuters — 4:41 am ET (0941 GMT) Small-launch leader Rocket Lab going public via a SPAC, with plans for bigger Neutron rocket
CNBC — 4:41 am ET (0941 GMT) |
