caa a22 4500 388022396 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1557/JMR.1998.0320 doi S0884291400045568 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0320 Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation [Elektronische Daten] The half-thickness and mass absorption coefficient of 13.0 keV x-rays, 46.5 keV γ-rays, and 1.16 MeV βƟ particles have been measured for pristine, bromine intercalated, and iodine monobromide intercalated pitch-based graphite fiber composites. Since these materials have been proposed to replace aluminum structures in spacecraft, the results were compared to aluminum. Pristine graphite epoxy composites were found to have about 4.0 times the half-thickness, and 40% of the mass absorption of aluminum for ionizing radiation. Bromine intercalation improved performance to 90% of the half-thickness, and 1.7 times the mass absorption coefficient of aluminum. Iodine monobromide extended the performance to 70% of the half-thickness and 3.0 times the mass absorption of aluminum. Thus, intercalation not only makes up the deficiency conventional composites have in shielding components from ionizing radiation, but actually confers advantages in mass and thickness over aluminum. The βƟ particle shielding of all the materials tested was found to be very effective. The shielding of all of the materials was found to have nearly the same mass absorption coefficient of 17.8 ± 0.9 cm2/g. Inelastic scattering processes were found to be important in βƟ particle shielding; however, the extent of inelastic scattering and thus the distribution of energies of the transmitted electrons did not vary with material. Copyright © Materials Research Society 1998 Gaier James R. National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135 Hardebeck Wendie C. Manchester College, North Manchester, Indiana 46962 Bunch Jennifer R. Terry Manchester College, North Manchester, Indiana 46962 Davidson Michelle L. Manchester College, North Manchester, Indiana 46962 Beery Dwight B. Manchester College, North Manchester, Indiana 46962 Journal of Materials Research Cambridge University Press 13/8(1998-08), 2297-2301 0884-2914 13:8<2297 1998 13 JMR https://doi.org/10.1557/JMR.1998.0320 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0320 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gaier James R. National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135 NATIONALLICENCE 700 1- Hardebeck Wendie C. Manchester College, North Manchester, Indiana 46962 NATIONALLICENCE 700 1- Bunch Jennifer R. Terry Manchester College, North Manchester, Indiana 46962 NATIONALLICENCE 700 1- Davidson Michelle L. Manchester College, North Manchester, Indiana 46962 NATIONALLICENCE 700 1- Beery Dwight B. Manchester College, North Manchester, Indiana 46962 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/8(1998-08), 2297-2301 0884-2914 13:8<2297 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge