title: Solar proton exposure of an ICRU sphere within a complex structure Part I: Combinatorial geometry.
abstract: The 3DHZETRN code, with improved neutron and light ion (Z≤2) transport procedures, was recently developed and compared to Monte Carlo (MC) simulations using simplified spherical geometries. It was shown that 3DHZETRN agrees with the MC codes to the extent they agree with each other. In the present report, the 3DHZETRN code is extended to enable analysis in general combinatorial geometry. A more complex shielding structure with internal parts surrounding a tissue sphere is considered and compared against MC simulations. It is shown that even in the more complex geometry, 3DHZETRN agrees well with the MC codes and maintains a high degree of computational efficiency.
authors.affiliation: Old Dominion University, Norfolk VA 23529 USA.
authors.forename: John W
authors.initials: JW
authors.lastname: Wilson
authors.affiliation: NASA Langley Research Center, Hampton VA 23681-2199 USA. Electronic address: tony.c.slaba@nasa.gov.
authors.forename: Tony C
authors.initials: TC
authors.lastname: Slaba
authors.affiliation: Old Dominion University, Norfolk VA 23529 USA.
authors.forename: Francis F
authors.initials: FF
authors.lastname: Badavi
authors.affiliation: NASA Johnson Space Center, Houston, TX 77004 USA.
authors.forename: Brandon D
authors.initials: BD
authors.lastname: Reddell
authors.affiliation: NASA Johnson Space Center, Houston, TX 77004 USA.
authors.forename: Amir A
authors.initials: AA
authors.lastname: Bahadori
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008962:Models, Theoretical; D009010:Monte Carlo Method; D011522:Protons; D011829:Radiation Dosage; D000069079:Radiation Exposure; D019445:Solar Activity
chemical_list: D011522:Protons
keywords: HZETRN; Radiation shielding; Radiation transport; Space radiation