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Matthi
, D.*; Ehresmann, B.*; Lohf, H.*; K
hler, J.*; Zeitlin, C.*; Appel, J.*; Sato, Tatsuhiko; Slaba, T. C.*; Martin, C.*; Berger, T.*; et al.
Journal of Space Weather and Space Climate (Internet), 6, p.A13_1 - A13_17, 2016/03
Times Cited Count：65 Percentile：93.52(Astronomy & Astrophysics)The Radiation Assessment Detector (RAD) on the Mars Science Laboratory (MSL) has been measuring the radiation environment on the surface of Mars since August 6th 2012. In this work, several models such as GEANT4, PHITS, and HZETRN/OLTARIS are used to predict the radiation environment caused by galactic cosmic rays on Mars in order to compare and validate them with the experimental results. Although good agreement is found in many cases for GEANT4, PHITS and HZETRN/OLTARIS, some models still show large, sometimes order of magnitude, discrepancies in certain particle spectra. We have found that RAD data is helping make better choices of input parameters and physical models. These results help to predict dose rates for future manned missions as well as to perform shield optimization studies.
Bahadori, A. A.*; Sato, Tatsuhiko; Slaba, T. C.*; Shavers, M. R.*; Semones, E. J.*; Baalen, M. V.*; Bolch, W. E.*
Physics in Medicine & Biology, 58(20), p.7183 - 7207, 2013/10
Times Cited Count：11 Percentile：40.14(Engineering, Biomedical)In the present study, organ absorbed doses and dose equivalents are calculated for 50th percentile male and female astronaut phantoms using both the NASA High Charge and Energy Transport Code (HZETRN) to perform one-dimensional deterministic transport and using the Particle and Heavy Ion Transport code System (PHITS) to perform three-dimensional Monte Carlo transport. Code-to-code benchmarks allow for the comparison of differential quantities, such as secondary particle differential fluence, to provide insight into differences observed in integral quantities for particular components of the GCR spectrum.
