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RE: Re: " we're evolved for radiation " - geophysicist on pole reversals
Kim, Figure 3.7 in NCRP Report shows what you mention below. I think that
part of the problem with exposure is the time spent in space. The current
plans to go from Earth to Mars in 6 months will exposure human to radiation
for too long. I believe there was talk in the past of using nuclear power
engines, which would reduce the transit time tremendously.
-- John
John Jacobus, MS
Certified Health Physicist
3050 Traymore Lane
Bowie, MD 20715-2024
E-mail: jenday1@email.msn.com (H)
-----Original Message-----
From: Kim D. Merritt [mailto:k.merritt@larc.nasa.gov]
Sent: Tuesday, November 05, 2002 7:42 AM
To: 'radsafe@list.vanderbilt.edu'
Subject: RE: Re: " we're evolved for radiation " - geophysicist on pole
reversals
The shielding that the earth gets from cosmogenic radiation is actually
from solar radiation itself. During the period of solar maximum activity
the cosmic radiation levels will go down and go up during solar
minimum. Thus the farther out you get in the solar system the greater the
level of cosmic radiation, which is why it is difficult to shield outer
solar system exploration craft.
Granted, this was a very simplistic explanation but there is a good deal of
information out there if you are interested. Try looking up papers but
John Wilson of NASA Langley Research Center or try finding "NASA Conference
Publication 3360, Shielding strategies for Human Space Exploration". I
have no idea if it is available on line.
. . .
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