Comparison of measured cosmic ray LET spectra with models and predictions

Details Comparison of measured cosmic ray LET spectra with models and predictions Comparison of measured cosmic ray LET spectra with models and predictions

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14..969h&link_type=abstract

Advances in Space Research, vol. 14, no. 10, p. 969-977

Mathematics

2

Cosmic Rays, Linear Energy Transfer (Let), Mathematical Models, Nuclear Emulsions, Particle Tracks, Radiation Measuring Instruments, Apollo 16 Flight, Apollo 17 Flight, Crres (Satellite), Long Duration Exposure Facility, Prognoz Satellites, Radiation Belts, Single Event Upsets

Scientific paper

Radiation effects of cosmic ray nuclei are generally described as a function of the particle Linear Energy Transfer (LET). For a large number of space missions LET spectra have been measured and models have been developed to calculate these spectra that include the effects of geomagnetic shielding and shielding provided by material. In this paper we compare measured and calculated LET spectra. For low earth orbits events with high local energy deposition, ie., short range secondaries, contribute significantly to the measured spectra. These events are produced by nuclear interactions, mainly induced by protons from the South Atlantic Anomaly. The technique to include these contributions in the models depends on size of radiation sensitive volumes. For sizes comparable to or larger than the range of target secondaries it is essential to separate contributions by target interactions from those of cosmic rays. This separation is possible in experiments which use stacks of plastic nuclear track detectors. The yield of short range events generated by protons and measured in the detector can be calibrated from accelerator experimental data. We present first results for CR-39 detectors.

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