| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Next Steps for Improved Defect Production and Mixing Parameters: Beyond NRT DPA, ARC-DPA and RPA |
| Author(s) |
Steven J. Zinkle |
| On-Site Speaker (Planned) |
Steven J. Zinkle |
| Abstract Scope |
Quantitatively accurate model predictions of radiation effects processes in materials requires knowledge of several defect production and mixing parameters. The international benchmark for defect production (NRT dpa) was developed in the mid 1970s based on relatively simplistic binary collision approximation simulations, and was shown to be inaccurate for energetic displacement cascades within two years of its publication. Two improved parameters known as athermal recombination corrected (ARC-DPA) and replacements per atom (RPA) have recently been recommended to account for in-cascade recombination and mixing in energetic displacement cascades. However, these parameters are only valid for temperatures near absolute zero. Consideration of correlated recombination effects leads to additional modifications of the NRT dpa value for all irradiation sources. This presentation will summarize experimental and modeling studies that indicate the correlated recombination-corrected defect production (CORR-DPA) at elevated temperatures is ~20-30% of the NRT dpa for energetic cascades and electron irradiations, respectively. |
| Proceedings Inclusion? |
Undecided |