Re: Protection against Van Allen Radiation
- From: henry@xxxxxxxxxxxxx (Henry Spencer)
- Date: Mon, 9 Oct 2006 18:01:34 GMT
In article <1160393043.916069.281390@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Vince Cate <vincecate@xxxxxxxxx> wrote:
In "The Space Environment" by N. H. Langton (1969) they say the
Apollo plan was to avoid most of the van Allen belt radiation by
going through near the edge...
Apollo trajectories ended up being so tightly constrained by orbital
mechanics and thin fuel margins that they were planned without
consideration of this. The CM provided about 8g/cm^2 aluminum equivalent
of shielding, which was deemed adequate for a quick passage through the
belts, as confirmed by measurements on the Apollo 4 and Apollo 6 unmanned
test flights:
"These missions show that there will be no biological hazard
associated with passage through the trapped radiation belts during
the translunar and trans-Earth phase of Apollo lunar missions,
providing that there are no further high-altitude nuclear tests
and that astronaut activity is confined to the command module during
belt passage."
Apollo radiation doses varied considerably, but total-mission doses were
under 600mrad except for Apollo 14, which was up around 1200.
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