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Comparison of aluminum and lucite for shielding against 1 GeV protons

Davide Mancusi (Institutionen för teknisk fysik, Nukleär teknik) ; Antonella Bertucci ; Giancarlo Gialanella ; Gianfranco Grossi ; Lorenzo Manti ; Mariagabriella Pugliese ; Adam Rusek ; Paola Scampoli ; Lembit Sihver (Institutionen för teknisk fysik, Nukleär teknik) ; Marco Durante
Advances in Space Research (0273-1177). Vol. 40 (2007), 4, p. 581–585.
[Artikel, refereegranskad vetenskaplig]

Shielding is the only countermeasure currently available for exposure to cosmic radiation during space travel. We compared aluminum (Al) and polymethylmethacrylate (PMMA, or lucite) shields of 20 g/cm^2 thickness using 1 GeV protons accelerated at the NASA Space Radiation Laboratory. The dose rate increased after the shield, and the increase was more pronounced after the Al than the PMMA shield. No significant differences in the induction of chromosomal aberrations were observed in human lymphocytes exposed to the same dose with no shield or behind the Al and PMMA blocks. However, the biological effectiveness per incident proton was increased by the shields. Simulations using the General-Purpose Particle and Heavy-Ion Transport Code System (PHITS) show that the increase in dose is caused by target fragments, and aluminum produces more secondary protons than PMMA. Nevertheless, the spectrum of particles behind the shield is confined within the low-LET region, and the biological effectiveness is consequently similar.

Nyckelord: Protons, Shielding, Chromosome aberrations, Fragmentation



Denna post skapades 2008-01-24. Senast ändrad 2013-05-20.
CPL Pubid: 67772

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

Ämnesområden

Mellanenergifysik
Annan biologi

Chalmers infrastruktur

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