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Proceedings Paper

Spacecraft displacement damage dose calculations for shielded CCDs
Author(s): Cheryl J. Dale; Paul W. Marshall; Bill Cummings; Louis Shamey; Russ A. Howard; Alan W. Delamere
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Paper Abstract

The particle environment within a satellite includes primary and secondary protons and secondary neutrons produced in spacecraft materials which we evaluate using the transport code BRYNTRN. The damaging effects of this mixed particle environment is evaluated for the example of solid state imaging arrays by introducing the concept of displacement damage dose. Having the same relationship as electronic stopping power (LET) and radiation absorbed dose (rad) the nonionizing energy loss rate NIEL) of protons and neutrons are combined in terms of nonionizing radiation absorbed dose (nirad). This quantity is evaluated as a function of Ta and Al shield thickness for both trapped and flare proton environments. Al is shown to be a superior shield material per unit mass partially due to the damaging effects of neutrons which are produced in greater abundance in Ta. This method for combining the damaging effects from all particles using displacement damage dose enables informed shielding decisions and improved prediction of device performance in space. 1.

Paper Details

Date Published: 12 August 1992
PDF: 12 pages
Proc. SPIE 1656, High-Resolution Sensors and Hybrid Systems, (12 August 1992); doi: 10.1117/12.135950
Show Author Affiliations
Cheryl J. Dale, Naval Research Lab. (United States)
Paul W. Marshall, Naval Research Lab and SFA Inc. (United States)
Bill Cummings, Ball Aerospace Systems Group (United States)
Louis Shamey, Ball Aerospace Systems Group (United States)
Russ A. Howard, Naval Research Lab. (United States)
Alan W. Delamere, Ball Aerospace Systems Group (United States)

Published in SPIE Proceedings Vol. 1656:
High-Resolution Sensors and Hybrid Systems
Morley M. Blouke; Winchyi Chang; Laurence J. Thorpe; Rajinder P. Khosla, Editor(s)

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