Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002exa....14...45g&link_type=abstract
Experimental Astronomy, v. 14, Issue 1, p. 45-55 (2002).
Astronomy and Astrophysics
Astronomy
4
Back Illuminated, Charge-Coupled Device (Ccd), Compton Scattering, Cosmic Rays, Fully Depleted, Gamma Ray, High Resistivity
Scientific paper
Cosmic-ray muons make recognizable straight tracks in the new-generation CCD’s with thick sensitive regions. Wandering tracks (‘worms’), which we identify with multiply-scattered low-energy electrons, are readily recognized as different from the muon tracks. These appear to be mostly recoils from Compton-scattered gamma rays, although worms are also produceddirectly by beta emitters in dewar windows and field lenses. The gamma rays are mostly byproducts of 40K decay and the U and Th decay chains. Trace amounts of these elements are nearly always present in concrete and other materials. The direct betas can be eliminated and the Compton recoils can be reduced significantly by the judicious choice of materials and shielding. The cosmic-ray muon rate is irreducible. Our conclusions are supported by tests at the Lawrence Berkeley National Laboratory low-level counting facilities in Berkeley and 180 m underground at Oroville, California.
No associations
LandOfFree
Cosmic rays and other nonsense in astronomical CCD imagers 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 Cosmic rays and other nonsense in astronomical CCD imagers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic rays and other nonsense in astronomical CCD imagers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1678722