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Cosmic Ray Particles Images with ORCA-II ERG
  • George McNamara

Cosmic ray particles image series acquired using a Hamamatsu ORCA-II ERG scientific grade CCD camera, cooled to -60 C. Each image is a consecutive 600 second (10 minute) exposure time with no light to the camera.

While processing the data, I discoverd that the background changed around planes 25 and 227 (see Excel file and jpeg screenshots), so I also processed only planes 025-227 (203 planes total, 2030 minutes, 33.83 hours). the CCD industry "rule of thumb" for a "typical" CCD sensor (i.e. 1/3" CCD) is that one cosmic ray particle strikes a sensor approximately every 30 seconds (assuming not in a lead box ... also assuming the surrounding instruments and walls, cieling and floor were not radioactive).

This dataset was acquired in the Analytical Imaging Core Facility (AICF) on the 6th floor (top floor) of the Diabetes Research Institute, Miller School of Medicine, University of Miami, July 2-4, 2012.

Data posted here at my bepress web site to celebrate the August 7, 2012 centenary of the discover of cosmic ray particles by Victor Hess. For more informations, see

  • Cosmic ray particles,
  • CCD camera,
  • image processing
Publication Date
Summer August 10, 2012
Data is not subject to copyright (at least in the USA).
Citation Information
George McNamara. "Cosmic Ray Particles Images with ORCA-II ERG" (2012)
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