[2E01-06] Irradiation Effect

[2E01] Investigating the Impact of Non-normalized Atom Probe Tomography Measurements and its Standardization

*Daoyu Pan¹, Kenta Murakami¹, Dongyue Chen¹, Naoto Sekimura¹ (1. UTokyo)

Keywords:Atom probe tomography, Detection efficiency, Reactor pressure vessel steels, Irradiation embrittlement, Solute clusters, Maximum Separation Method

In spite of the increasing sophistication of Atom Probe Tomography (APT) instruments, the methods for measurement and analysis of APT are still not standardized internationally. Non-normalized APT measurements may bring data uncertainties and may even amplify APT artifacts when assessing the ageing condition of nuclear materials. In this work, the non-uniform density distribution was examined in some high-detection-efficiency APT data of Reactor Pressure Vessel (RPV) steels. The simulation of low-detection-efficiency APT data was performed by simplistic reduction of atomic density, to compare the effects of different detection efficiency on the result of cluster analysis using Maximum Separation Method (MSM).