Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1687p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Sept. 1991, p. 1687-1690.
Physics
1
Atmospheric Diffusion, Beryllium 10, Beryllium 7, Long Duration Exposure Facility, Radioactive Isotopes, Spacecraft Charging, Particle Diffusion, Vertical Distribution
Scientific paper
Theoretical profiles of cosmogenic Be-7 in the atmosphere above 100 km were computed in an effort to explain unexpectedly high accumulations of this radionuclide found on the leading surfaces of the Long Duration Exposure Facility (LDEF) spacecraft. Diffusion calculations suggest that gravitational fractionation is sufficient to explain most, and possibly all, of the observed Be-7 enrichment at the recovery altitude of the spacecraft, provided only that the nuclide exists at and above the turbopause predominantly in the form of free atoms. Upward diffusion of Be-7 atoms through the turbopause appears to occur rapidly enough to largely offset losses at higher altitudes due to radioactive decay. The same model is used to compute cosmogenic Be-10 profiles in order to predict the probable outcome of planned measurements of Be-10 accumulations on LDEF surfaces.
No associations
LandOfFree
Equilibrium profiles of atomic Be-7 and Be-10 in the atmosphere above 100 km does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Equilibrium profiles of atomic Be-7 and Be-10 in the atmosphere above 100 km, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Equilibrium profiles of atomic Be-7 and Be-10 in the atmosphere above 100 km will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1339725