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The risk of solar proton events to space missionsThe total dose in rads-tissue from solar protons was tabulated for weekly time intervals, and the number of weeks which gave a dose above 25 rads behind 10 g/sq cm of aluminum for the active 6 years of the 19th cycle were called dangerous or large event weeks. The number of such event weeks was found to be only 3 weeks for the past 20 years. Even though the chance for smaller events is examined, it was found that for any reasonable, high confidence level (95%), the smaller events could be ignored. Consequently, the total particle flux for the 19th cycle was divided by a factor of 3 and determined a single large event week. Using this spectrum, the tissue dose in rads is calculated at the center of an aluminum spherical shell.
Document ID
Document Type
Conference Paper
Burrell, M. O. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: Proc. of the Natl. Symp. on Nat. and Manmade Radiation in Space
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19720009951Analytic PrimaryProceedings of the National Symposium on Natural and Manmade Radiation in Space