Title :
Effects of secondary particles on the total dose and the displacement damage in space proton environments
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
fDate :
2/1/2001 12:00:00 AM
Abstract :
MCNPX, a powerful Monte Carlo charged particle transport code, is introduced in this paper for space-radiation effect applications. By using MCNPX version 2.1.5, the enhancement of the total dose and the displacement damage due to secondary particles generated by the protons in the typical space radiation environments was assessed, then the results were compared to those obtained by the continuous slowing down approximation (CSDA) method. The comparison showed that the effects of the secondary particles were up to +7% for the total dose and up to +25% for the displacement damage when compared to the respective CSDA results in heavy shielding applications where trapped and solar protons dominate. Also presented in this paper is a method to compute the neutron/proton displacement cross sections by using MCNPX. The cross sections obtained show an excellent agreement with previously published values
Keywords :
Monte Carlo methods; artificial satellites; cosmic ray protons; dosimetry; energy loss of particles; proton effects; shielding; MCNPX; Monte Carlo charged particle transport code; continuous slowing down approximation; displacement damage; energy losses; heavy shielding; neutron displacement cross section; proton displacement cross section; satellites; secondary particles; solar protons; space proton environments; space-radiation effect applications; total dose; trapped protons; Atomic layer deposition; Atomic measurements; Circuits; Cosmic rays; Electromagnetic radiation; Mesons; Neutrons; Protons; Satellites; Space charge;
Journal_Title :
Nuclear Science, IEEE Transactions on
