|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||A Virtual Experiment Approach to Positron Annihilation Spectroscopy
||Aaron Kohnert, Laurent Capolungo
|On-Site Speaker (Planned)
Positron annihilation lifetime spectroscopy is a technique used to analyze the vacancy and vacancy cluster content of irradiated materials, providing a unique means to measure radiation damage features too small for direct observation in electron microscopes. On the other hand, lifetime spectra require interpretation to extract quantitative information. This study uses an integrated modeling approach to generate lifetime spectra from fully representative vacancy cluster size distributions obtained under a variety of damage conditions from cluster dynamics modeling. The virtual spectra are compared to experimental datasets and analyzed to determine how reliably spectrum fitting techniques such as the two trap method can extract quantitative information in the case of complex size distributions. Finally, the effects of uncertainty in key parameters such as trapping coefficients and trapped positron lifetimes are explored systematically.