title: Solar proton exposure of an ICRU sphere within a complex structure part II: Ray-trace geometry.
abstract: A computationally efficient 3DHZETRN code with enhanced neutron and light ion (Z ≤ 2) propagation was recently developed for complex, inhomogeneous shield geometry described by combinatorial objects. Comparisons were made between 3DHZETRN results and Monte Carlo (MC) simulations at locations within the combinatorial geometry, and 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 ray-trace geometry. This latest extension enables the code to be used within current engineering design practices utilizing fully detailed vehicle and habitat geometries. Through convergence testing, it is shown that fidelity in an actual shield geometry can be maintained in the discrete ray-trace description by systematically increasing the number of discrete rays used. It is also shown that this fidelity is carried into transport procedures and resulting exposure quantities without sacrificing computational efficiency.
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: John W
authors.initials: JW
authors.lastname: Wilson
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; D011835:Radiation Protection; D019445:Solar Activity
chemical_list: D011522:Protons
keywords: HZETRN; Radiation shielding; Radiation transport; Space radiation