Loading...
Please wait, while we are loading the content...
The effects of surface roughness on the near xrs elemental results: monte-carlo modeling
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Nittler, Larry R. Lin, Lucy F. |
| Copyright Year | 2011 |
| Description | The objective of the NEAR-Shoemaker X-ray Gamma-Ray Spec1roscopy ("XGRS") investigation was to determine the elemental composition of the near-Earth asteroid 433 Eros. The X-ray Spectrometer (XRS) system measured the characteristic fluorescence of six major elements (Mg, Al, Si, S, Ca, Fe) in the 1-10 keV energy range excited by the interaction of solar X-rays with the upper 100 microns of the surface of 433 Eros. Various investigators, using both laboratory experiments and computer simulations have established that X-ray fluorescent line ratios can be influenced by small-scale surface roughness at high incidence or emission angles. The effect on the line ratio is specific to the geometry, excitation spectrum, and composition involved, In general, however, the effect is only substantial for ratios of lines with a significant energy difference between them: Fe/Si and Ca/Si are much more likely to be affected than AI/Si or Mg/Si. We apply a Monte-Carlo code to the specific geometry and spectrum of a major NEAR XRS solar flare observation, using an H chondrite composition as the substrate. The seventeen most abundant elements were included in the composition model, from oxygen to titanium. |
| File Size | 106701 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110008262 |
| Archival Resource Key | ark:/13960/t17m58b04 |
| Language | English |
| Publisher Date | 2011-03-05 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Science And Exploration Asteroids Near Earth Asteroid Rendezvous Mission Chondrites Chemical Composition Monte Carlo Method Surface Roughness Effects X Ray Spectrometers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
