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  • 1
    Publication Date: 2006-01-12
    Description: Light flashes caused by the interaction of cosmic particles with the visual apparatus have been observed by astronauts on all space missions since Apollo 11. This Apollo Soyuz Test Project experiment compared measurements of the observer's visual sensitivity with measurements of the ambient radiation environment and with the frequency and character of the flashes observed. The data obtained reveal a latitude dependence of the frequency of observed flashes. This distribution of flashes is correlated with the distribution of cosmic particles with stopping power greater than 15 keV/ micrometers in the eye. The interaction of dark adaptation, specific ionization, and range of particles in the retina as factors in the visualization of particle passage is discussed.
    Keywords: AEROSPACE MEDICINE
    Type: NASA. Lyndon B. Johnson Space Center Apollo-Soyuz Test Project; 16 p
    Format: text
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  • 2
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    In:  CASI
    Publication Date: 2013-08-31
    Description: The design and the atomic composition of Charge Coupled Devices (CCD's) make them unique for investigations of single energetic particle events. As detector system for ionizing particles they detect single particles with local resolution and near real time particle tracking. In combination with its properties as optical sensor, particle transversals of single particles are to be correlated to any objects attached to the light sensitive surface of the sensor by simple imaging of their shadow and subsequent image analysis of both, optical image and particle effects, observed in affected pixels. With biological objects it is possible for the first time to investigate effects of single heavy ions in tissue or extinguished organs of metabolizing (i.e. moving) systems with a local resolution better than 15 microns. Calibration data for particle detection in CCD's are presented for low energetic protons and heavy ions.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA. Ames Research Center, Minutes of the 12th Joint NASA(DARA-DLR Life Sciences Program Working Group Meeting; p 5-10
    Format: application/pdf
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