Analysis of computational methods used to optimize transmission x-ray targets for 100- to 500-kv x-ray tubes
Abstract
Objective.While the process of designing a low-to-medium energy transmission x-ray target follows a similar general approach throughout the literature, the specific methodology can vary substantially. The goal of this study was to determine the sensitivity of x-ray target optimization to different methods of x-ray quantification and temperature modeling.Approach.Ultrathin (1.5- to 90-m) tungsten transmission x-ray targets were modeled in TOPAS (v.3.8) and bombarded with electrons at energies of 100-500 keV. Simulations were run to compare the optimal target thickness according to various tallies of the emitted x-ray field, including primary beam fluence, energy fluence, air KERMA, dose to water in air, or dose to water at depth in phantom. The optimized targets for each energy were simulated again to calculate the spatial distribution of heat deposited within the target and the attached diamond or copper window. Finally, COMSOL Multiphysics® was used to compare temperature calculations with a volumetric heat source model versus a simplified surface heat source model.Main results.The target thickness optima varied significantly across the different x-ray quantities; whereas some metrics favored very thin targets (50m) weighted towards higher-energy x-ray fields. Heat calculations in the optimized targets showed that single-scattering Monte Carlo produced a greater energy deposition tally compared to multiple-scattering models. Lastly, finite element temperature calculations…
Read the paper
Related studies
- The potential and limitations of neutrons, electrons and X-rays for atomic resolution microscopy of unstained biological molecules
- X-ray-Computed Tomography Contrast Agents
- Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques
- Single-crystal X-ray diffraction studies on structural transformations of porous coordination polymers
- Investigation of solid/vapor interfaces using ambient pressure X-ray photoelectron spectroscopy
- Resonant X-Ray Scattering Studies of Charge Order in Cuprates
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.