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Space Radiation Environment Measurement Program by utilizing STS-84

Outline of the Mission
Major Accomplishments of STS-84  
Real time Radiation Monitoring Device (RRMD)
Crew of STS-84
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Outline of the Mission

National Space Development Agency of Japan (NASDA) has performed Space Radiation Environment Measurement Experiment in May 1997. Real time Radiation Monitoring Device (RRMD) on board the Space Shuttle Atlantis (STS-84) which was launched on May 15 was used and the experiment was terminated on 24 May. This experiment was planned for the purpose of applying its results for planning the measures used to avoid the effect of space radiation in the International Space Station (ISS) by monitoring the space radiation environment under similar orbital environment as the ISS. 

Shuttle/Mir mission is being promoted as the first step of the International Space Station (ISS) with the primary effort by USA and Russia. The purpose of this mission is to mitigate the technical risks of constructing and operating the ISS prior to the actual activities by checking technical issues, extracting problems and accumulating international space activities experiences. Shuttle/Mir mission activities include docking Space Shuttle with Russian Space Station Mir and to navigate cooperatively each other, transferring crew and supplying goods from Shuttle, performing extravehicular activities (EVA) by astronauts from both countries and promoting scientific researches which are inevitable prior to the utilization activities of the ISS.

From 1995 through 1998 nine missions have been assigned for Shuttle/Mir mission, and STS-84 is the one of them.

Mission summary of STS-84
Orbiter Atlantis(19th flight)
Launch date and time May 15 1997 4:08 a.m. (EDT)
Launch site NASA Kennedy Space Center
Initial orbital altitude 296km
Docked flight altitude apogee 402 km/ perigee 389 km
Orbital inclination 51.6 degrees
Orbital period 90 min
Mission duration 9days 5hr 20min
Landing date and time May 24 1997 8:28 a.m. (EDT)
Landing site NASA Kennedy Space Center

Major Accomplishments of STS-84

Space radiation measurement was conducted by RRMD aboard STS-84 on the same orbit as STS-79 orbited. On this mission, an investigation was made on low-energy particles, in consequence of which it was revealed that most of these particles were concentrated in the South Atlantic Anomaly (SAA) zone.

As for the biological effect by space radiation, an experiment was made using such specimens as silkworm eggs, dicty ostelium discoideums, colitis germs, radiation-resistant bacteria, and genetic DNA. At present, analyses are under way to elucidate the bodily reaction mechanism of these specimens vital for repair of DNA damages by space radiation, the effect of the space environment over their embryonic development and differentiation, and the genetic effect exerted over the silkworm's offspring during the process of their growth in space.

Last Updated : March 27, 1998



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